AUTOMATIC HVAC SYSTEM

• HEADINGS
  • HVAC (Heating, Ventilation, and Air Conditioning)
    • Special Tools
  • Climate Control
    • Component Location Index
    • A/C Service Tips and Precautions
    • A/C Refrigerant Oil Replacement
    • A/C Line Replacement
    • General Troubleshooting Information
      • How to Check for DTCs with the HDS
      • How to Retrieve a DTC (Without HDS)
      • Checking DTCs by DTC Indicator
      • Displaying Sensor Inputs at the Climate Control Unit
    • DTC Troubleshooting Index
    • Symptom Troubleshooting Index
    • System Description
      • Climate Control Door Positions
      • Dual Air Mix Control System
      • Climate Control Unit Inputs and Outputs
    • Circuit Diagram
    • DTC Troubleshooting
      • DTC B1225 or DTC indicator A: An Open in the In-car Temperature Sensor Circuit
      • DTC B1226 or DTC indicator B: A Short in the In-car Temperature Sensor Circuit
      • DTC B1227 or DTC indicator C: An Open in the Outside Air Temperature Sensor Circuit
      • DTC B1228 or DTC indicator D: A Short in the Outside Air Temperature Sensor Circuit
      • DTC B1229 or DTC indicator E: An Open in the Sunlight Sensor Circuit
      • DTC B1230 or DTC indicator F: A Short in the Sunlight Sensor Circuit
      • DTC B1231 or DTC indicator G: An Open in the Evaporator Temperature Sensor Circuit
      • DTC B1232 or DTC indicator H: A Short in the Evaporator Temperature Sensor Circuit
      • DTC B1233 or DTC indicator I: An Open in the Driver's Air Mix Control Motor Circuit
      • DTC B1234 or DTC indicator J: A Short in the Driver's Air Mix Control Motor Circuit
      • DTC B1235 or DTC indicator K: A Problem in the Driver's Air Mix Control Linkage, Door, or Motor
      • DTC B1239 or DTC indicator L: A Short or Open in the Mode Control Motor Circuit
      • DTC B1240 or DTC indicator M: A Problem in the Mode Control Linkage, Doors, or Motor
      • DTC B1241 or DTC indicator N: A Problem in the Blower Motor Circuit
      • DTC B1236 or DTC indicator O: An Open in the Passenger's Air Mix Control Motor Circuit
      • DTC B1237 or DTC indicator P: A Short in the Passenger's Air Mix Control Motor Circuit
      • DTC B1238 or DTC indicator Q: A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor
      • DTC B1202: Climate Control Unit Internal Error
      • DTC B1205: Climate Control Unit Lost Communication with the Gauge Control Module (VSP/NE messages); DTC B1206: Climate Control Unit Lost Communication with the Gauge Control Module (ECT messages); DTC B1207: Climate Control Unit Lost Communication with the Gauge Control Module (ILLUMI messages)
    • Recirculation Control Motor Circuit Troubleshooting
    • Climate Control Power and Ground Circuit Troubleshooting
    • A/C Condenser Fan Circuit Troubleshooting
    • Radiator and A/C Condenser Fan Common Circuit Troubleshooting
    • A/C Compressor Clutch Circuit Troubleshooting
    • A/C Pressure Switch and Thermal Protecter Circuit Troubleshooting
    • In-car Temperature Sensor Test
    • In-car Temperature Sensor Replacement
    • Outside Air Temperature Sensor Test
    • Outside Air Temperature Sensor Replacement
    • Sunlight Sensor Test
    • Sunlight Sensor Replacement
    • Evaporator Temperature Sensor Test
    • Evaporator Temperature Sensor Replacement
    • Power Transistor Test
    • Driver's Air Mix Control Motor Test
    • Driver's Air Mix Control Motor Replacement
    • Passenger's Air Mix Control Motor Test
    • Passenger's Air Mix Control Motor Replacement
    • Mode Control Motor Test
    • Mode Control Motor Replacement
    • Recirculation Control Motor Test
    • Recirculation Control Motor Replacement
    • Dust and Pollen Filter Replacement
    • Blower Unit Removal/Installation
    • Blower Unit Component Replacement
    • Evaporator Core Replacement
    • Expansion Valve Replacement
    • Heater Unit/Core Replacement
    • Heater Valve Cable Adjustment
    • A/C Compressor Replacement
    • A/C Compressor Clutch Check
    • A/C Compressor Clutch Overhaul
    • A/C Compressor Thermal Protector Replacement
    • A/C Compressor Relief Valve Replacement
    • A/C Condenser Replacement
    • Receiver/Dryer Desiccant Replacement
    • Refrigerant Recovery
    • System Evacuation
    • System Charging
    • Refrigerant Leak Test
    • A/C System Test
      • Performance Test
      • Pressure Test
• FIGURES
  • Fig. 1: Identifying Special Tools
  • Fig. 2: Identifying Climate Control Component Location (1 Of 3)
  • Fig. 3: Identifying Climate Control Component Location (2 Of 3)
  • Fig. 4: Identifying Climate Control Component Location (3 Of 3)
  • Fig. 5: Identifying A/C Compressor
  • Fig. 6: Identifying A/C Components With Torque Specifications
  • Fig. 7: Connecting HDS To DLC
  • Fig. 8: Identifying Temperature Indicator (Without Navigation System)
  • Fig. 9: Identifying Temperature Indicator (With Navigation System)
  • Fig. 10: Identifying Driver's Side Temperature Indicator
  • Fig. 11: Identifying Passenger's Side Temperature Indicator
  • Fig. 12: Identifying Driver's Side And Passenger's Side Temperature Indicator
  • Fig. 13: Air Conditioning Flow Diagram
  • Fig. 14: Climate Control Door Positions Chart (1 Of 2)
  • Fig. 15: Climate Control Door Positions Chart (2 Of 2)
  • Fig. 16: Dual Air Mix Control System Chart (1 Of 2)
  • Fig. 17: Dual Air Mix Control System Chart (2 Of 2)
  • Fig. 18: Identifying Audio-HVAC Display Panel Connectors Terminals
  • Fig. 19: Climate Control Circuit Diagram (1 Of 2)
  • Fig. 20: Climate Control Circuit Diagram (2 Of 2)
  • Fig. 21: Checking Continuity Between 11 Terminal Of Audio-Hvac Display Panel Connector A (22P) And Temperature Sensor 2P Connector
  • Fig. 22: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And In-Car Temperature Sensor 2P Connector
  • Fig. 23: Checking Continuity Between 11 Terminal Of Audio-HVAC Display Panel Connector A (22P) And Body Ground
  • Fig. 24: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Outside Air Temperature Sensor 2P Connector
  • Fig. 25: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Outside Air Temperature Sensor 2P Connector
  • Fig. 26: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Body Ground
  • Fig. 27: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Sunlight Sensor 2P Connector
  • Fig. 28: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Sunlight Sensor 2P Connector
  • Fig. 29: Checking Continuity Between No. 13 Terminal Of Audio-Hvac Display Panel Connector A (22P) And Body Ground
  • Fig. 30: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Evaporator Temperature Sensor 2P Connector
  • Fig. 31: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Evaporator Temperature Sensor 2P Connector
  • Fig. 32: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Body Ground
  • Fig. 33: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Driver's Air Mix Control Motor 7P Connector
  • Fig. 34: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 1 And 20
  • Fig. 35: Measuring Connector Terminal Voltage
  • Fig. 36: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Driver's Air Mix Control Motor 7P Connector
  • Fig. 37: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 8 And 9
  • Fig. 38: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals No. 16,17,18, And 19
  • Fig. 39: Measuring Connector Voltage
  • Fig. 40: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Mode Control Motor 7P Connector
  • Fig. 41: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Mode Control Motor 7P Connector
  • Fig. 42: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 6 And 7
  • Fig. 43: Connecting Blower Motor 2P Connector To Body Ground With Jumper Wire
  • Fig. 44: Checking Continuity Between No. 2 Terminal Of Power Transistor 4P Connector And Body Ground
  • Fig. 45: Connecting No. 2 And No. 4 Terminals Of Power Transistor 4P Connector With Jumper Wire
  • Fig. 46: Checking Continuity Between 1 And 2 Terminals Of Audio-Hvac Display Panel Connector B (16P) And Body Ground
  • Fig. 47: Checking Continuity Between Audio-HVAC Display Panel Connector B (16P) And Power Transistor 4P Connector
  • Fig. 48: Measuring Voltage Between No. 1 Terminal Of Blower Motor 2P Connector And Body Ground
  • Fig. 49: Measuring Voltage Between No. 2 Terminal Of Blower Motor Relay 4P Socket And Body Ground
  • Fig. 50: Measuring Voltage Between No. 4 Terminal Of Blower Motor Relay 4P Socket And Body Ground
  • Fig. 51: Checking Continuity Between Blower Motor Relay 4P Socket And Body Ground
  • Fig. 52: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Passenger's Air Mix Control Motor 7 P Connector
  • Fig. 53: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 2 And 20
  • Fig. 54: Measuring Voltage Of Connector Terminals
  • Fig. 55: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Passenger's Air Mix Control Motor 7P Connector
  • Fig. 56: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 10 And 22
  • Fig. 57: Checking Continuity Between Under-Dash Fuse/Relay Box Connector N (45P) And Audio-HVAC Display Panel Connector B (16P)
  • Fig. 58: Measuring Voltage Between No. 1 Terminal Of Recirculation Control Motor 7P Connector And Body Ground
  • Fig. 59: Checking Continuity Between 10 And 11 Terminals Of Audio-HVAC Display Panel Connector B (16P) And Body Ground
  • Fig. 60: Measuring Voltage Of Connector Terminals
  • Fig. 61: Checking Continuity Between Terminals Of Audio-HVAC Display Panel Connector B (16P) And Recirculation Control Motor 7P Connector
  • Fig. 62: Measuring Voltage Between 4 Terminal Of Audio-HVAC Display Panel Connector B (16P) And Body Ground
  • Fig. 63: Checking Continuity Between 6 Terminal Of Audio-HVAC Display Panel Connector B (16P) And Body Ground
  • Fig. 64: Measuring Voltage Between No. 1 Terminal Of A/C Condenser Fan Relay 4P Socket And Body Ground
  • Fig. 65: Connecting No. 1 And No. 2 Terminals Of A/C Condenser Fan Relay 4P Socket With Jumper Wire
  • Fig. 66: Measuring Voltage Between No. 3 Terminal Of A/C Condenser Fan Relay 4P Socket And Body Ground
  • Fig. 67: Checking Continuity Between A/C Condenser Fan Relay 4P Socket And A/C Condenser Fan 2P Connector
  • Fig. 68: Checking Continuity Between No. 1 Terminal Of A/C Condenser Fan 2P Connector And Body Ground
  • Fig. 69: Measuring Voltage Between No. 3 Terminal Of A/C Condenser Fan Relay 4P Socket And Body Ground
  • Fig. 70: Measuring Voltage Between No. 12 Terminal Of ECM/PCM Connector E (31P) And Body Ground
  • Fig. 71: Measuring Voltage Between No. 1 Terminal Of A/C Compressor Clutch Relay 4P Socket And Body Ground
  • Fig. 72: Connecting No. 1 And No. 2 Terminals Of A/C Compressor Clutch Relay 4P Socket With Jumper Wire
  • Fig. 73: Measuring Voltage Between No. 4 Terminal Of A/C Compressor Clutch Relay 4P Socket And Body Ground
  • Fig. 74: Measuring Voltage Between No. 18 Terminal Of ECM/PCM Connector E (31P) And Body Ground
  • Fig. 75: Checking Continuity Between A/C Compressor Clutch Relay 4P Socket And A/C Compressor Clutch 3P Connector
  • Fig. 76: Measuring Voltage Between No. 1 Terminal Of Thermal Protector 3P Connector And Body Ground
  • Fig. 77: Checking Continuity Between No. 1 And No. 3 Terminals Of Thermal Protector
  • Fig. 78: Measuring Voltage Between No. 1 Terminal Of A/C Pressure Switch 2P Connector And Body Ground
  • Fig. 79: Checking Continuity Between No. 1 And No. 2 Terminals Of A/C Pressure Switch
  • Fig. 80: Measuring Voltage Between No. 5 Terminal Of Audio-Hvac Display Panel Connector A (22P) And Body Ground
  • Fig. 81: Measuring Resistance Between No. 14 And No. 15 Terminals Of Audio-Hvac Display Panel Connector A (22P)
  • Fig. 82: Measuring Voltage Between Under-Hood Fuse/ Relay Box Connector H (14P) And Body Ground
  • Fig. 83: Checking Resistance Reading Between No. 1 And No. 2 Terminals Of In-Car Temperature Sensor
  • Fig. 84: Identifying In-Car Temperature Sensor And Driver's Inner Dashboard Trim
  • Fig. 85: Checking Resistance Reading Between No. 1 And No. 2 Terminals Of Outside Air Temperature Sensor
  • Fig. 86: Identifying Air Temperature Sensor, 2P Connector And Tab
  • Fig. 87: Identifying Sunlight Sensor
  • Fig. 88: Identifying Sunlight Sensor And 2P Connector
  • Fig. 89: Measuring Resistance Between Terminals
  • Fig. 90: Resistance And Temperature Graph
  • Fig. 91: Identifying 2P Connector, Evaporator Temperature Sensor And Connector Clip
  • Fig. 92: Identifying Power Transistor
  • Fig. 93: Identifying Lock Tab On No. 1 Connector Terminal
  • Fig. 94: Driver's Air Mix Control Motor
  • Fig. 95: Identifying 7P Connector And Driver's Air Mix Control Motor
  • Fig. 96: Passenger's Air Mix Control Motor
  • Fig. 97: Identifying 7P Connector And Passenger's Air Mix Control Motor
  • Fig. 98: Mode Control Motors
  • Fig. 99: Identifying Relays Of Bracket
  • Fig. 100: Identifying 7P Connector And Mode Control Motor
  • Fig. 101: Recirculation Control Motor
  • Fig. 102: Recirculation Control Motor
  • Fig. 103: Identifying 7P Connector And Recirculation Control Motor
  • Fig. 104: Identifying Pollen Filter Assembly And Evaporator
  • Fig. 105: Identifying Filter And Housing
  • Fig. 106: Identifying Wire Harness Connector Clips, Wire Harness Clip And Bolt
  • Fig. 107: Identifying Blower Unit Mounting Nuts And Bolts W/Torque Specifications
  • Fig. 108: Identifying Recirculation Control Motor, Pollen Filter And Blower Motor
  • Fig. 109: Identifying Suction Line And Receiver Line W/Torque Specification
  • Fig. 110: Identifying Wire Harness Clips, Expansion Valve Cover And Connectors
  • Fig. 111: Identifying Evaporator Core And Plate
  • Fig. 112: Identifying Expansion Valve Cover Bolts W/Torque Specification
  • Fig. 113: Identifying Cable Clamp, Heater Valve Cable And Heater Valve Arm
  • Fig. 114: Identifying Hose Clamps, Inlet Heater Hose And Outlet Heater Hose
  • Fig. 115: Identifying Heater Unit Mounting Nut W/Torque Specification
  • Fig. 116: Identifying Blower Heater Motor Connectors, Connector Clips W/Torque Specification
  • Fig. 117: Identifying Self-Tapping Screw, Heater Core Cover And Passenger's Heater Outlet
  • Fig. 118: Identifying Cable Clamp, Heater Valve Cable And Heater Valve Arm
  • Fig. 119: Identifying Cable Clamp, Heater Valve Cable And Air Mix Control Linkage
  • Fig. 120: Turning Heater Valve Arm
  • Fig. 121: Identifying A/C Compressor Clutch Connector, Mounting Bolts W/Torque Specifications
  • Fig. 122: Identifying A/C Compressor Clutch Connector Terminals W/Torque Specification
  • Fig. 123: Identifying A/C Compressor Clutch Connector, Mounting Bolts W/Torque Specification
  • Fig. 124: Rotating Rotor Pulley
  • Fig. 125: Measuring Clearance Between Rotor Pulley And Armature Plate
  • Fig. 126: Checking Thermal Protector For Continuity
  • Fig. 127: Checking Resistance Of Field Coil
  • Fig. 128: Removing Center Nut W/Torque Specification
  • Fig. 129: Identifying Armature Plate And Shim
  • Fig. 130: Identifying Snap Ring And Rotor Pulley
  • Fig. 131: Identifying Field Coil W/Torque Specification
  • Fig. 132: Identifying Thermal Protector W/Torque Specification
  • Fig. 133: Applying Silicone Sealant To Thermal Protector
  • Fig. 134: Identifying Relief Valve And O-Ring W/Torque Specification
  • Fig. 135: Identifying A/C Condenser, Intake Air Cover And Clips
  • Fig. 136: Identifying Reserve Tank, Hose And Bolts
  • Fig. 137: Identifying Radiator Upper Mount Brackets Bolts W/Torque Specification
  • Fig. 138: IDentifying Receiver Line Bolt W/Torque Specification
  • Fig. 139: Identifying A/C Condenser Upper Mount Brackets W/Torque Specification
  • Fig. 140: Identifying A/C Condenser Discharge Line Bolt W/Torque Specification
  • Fig. 141: Identifying A/C Condenser
  • Fig. 142: Identifying Lower Cushion, Cap And A/C Condenser
  • Fig. 143: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
  • Fig. 144: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
  • Fig. 145: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
  • Fig. 146: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
  • Fig. 147: Identifying Thermometer In Center Unit
  • Fig. 148: Ambient (Intake) Temperature Vs. Vent (Delivery) Temperature
  • Fig. 149: Ambient (Intake) Temperature Vs. High Side (Discharge) Pressure
  • Fig. 150: Ambient (Intake) Temperature Vs. Low Side (Suction) Pressure
• TABLES
  • DTC TEMPERATURE CHART
  • ITEM SPECIFICATION
  • CELSIUS TO FAHRENHEIT CONVERSION
  • CELSIUS TO FAHRENHEIT CONVERSION
  • ALPHANUMERIC CONVERSION REFERENCE
  • DTC TROUBLESHOOTING INDEX
  • DTC TROUBLESHOOTING INDEX
  • CONNECTOR A (◦ ON CIRCUIT DIAGRAM)
  • CONNECTOR B (□ ON CIRCUIT DIAGRAM)
  • DATA LIST REFERENCE
  • PRESSURE TEST

2004-08 HVAC

HVAC - TSX

HVAC (Heating, Ventilation, and Air Conditioning)

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) (If HVAC maintenance is required)

The Acura TSX SRS includes a driver's airbag in the steering wheel hub, a passenger's airbag in the dashboard above the glove box, seat belt tensioners in the front seat belt retractors, side curtain airbags in the sides of the roof, and side airbags in the front seat-backs. Information necessary to safely service the SRS is included in SRS (SUPPLEMENTAL RESTRAINT SYSTEM) . Items marked with an asterisk ( * ) on the contents page include or are located near SRS components. Servicing, disassembling, or replacing these items requires special precautions and tools, and should be done by an authorized Acura dealer.

• To avoid rendering the SRS inoperative, which could lead to personal injury or death in the event of a severe frontal or side collision, all SRS service work should be done by an authorized Acura dealer.
• Improper service procedures, including incorrect removal and installation of the SRS, could lead to personal injury caused by unintentional deployment of the airbags and/or side airbags.
• Do not bump or impact the SRS unit, front impact sensors, or side impact sensors when the ignition switch is ON (II), or for at least 3 minutes after the ignition switch is turned OFF; otherwise, the system may fail in a collision, or the airbags may deploy.
• SRS electrical connectors are identified by yellow color coding. Related components are located in the steering column, front console, dashboard, dashboard lower panel, in the dashboard above the glove box, in the front seats, in the roof side, and around the floor. Do not use electrical test equipment on these circuits.

Special Tools

Fig. 1: Identifying Special Tools
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Climate Control

Component Location Index

Fig. 2: Identifying Climate Control Component Location (1 Of 3)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig. 3: Identifying Climate Control Component Location (2 Of 3)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig. 4: Identifying Climate Control Component Location (3 Of 3)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

A/C Service Tips and Precautions

WARNING:

Compressed air mixed with the R-134a forms a combustible vapor. The vapor can burn or explode causing serious injury. Never use compressed air to pressure test R-134a service equipment or vehicle air conditioning systems.

CAUTION:

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. Be careful when connecting service equipment. Do not breathe refrigerant or vapor.

The air conditioning system uses HFC-134a (R-134a) refrigerant and polyalkyleneglycol (PAG) refrigerant oil, which are not compatible with CFC-12 (R-12) refrigerant and mineral oil. Do not use R-12 refrigerant or mineral oil in this system, and do not attempt to use R-12 servicing equipment; damage to the air conditioning system or your servicing equipment will result. Use only service equipment that is U.L-listed and is certified to meet the requirements of SAE J2210 to remove R-134a from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

R-134a service equipment or vehicle air conditioning systems should not be pressure tested or leak tested with compressed air.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

• Always disconnect the negative cable from the battery whenever replacing air conditioning parts.
• Keep moisture and dirt out of the system. When disconnecting any lines, plug or cap the fittings immediately; don't remove the caps or plugs until just before you reconnect each line.
• Before connecting any hose or line, apply a few drops of refrigerant oil to the O-ring.
• When tightening or loosening a fitting, use a second wrench to support the matching fitting.
• When discharging the system, use an R-134a refrigerant recovery/recycling/charging station; don't release refrigerant into the atmosphere.

A/C Refrigerant Oil Replacement

Recommended PAG oil: SP-10

• P/N 38897-P13-003: 120 mL (4 fl-oz)
• P/N 38899-P13-A01: 40 mL (1 1/3 fl-oz)

Add the recommended refrigerant oil in the amount listed if you replace any of the following parts.

• To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other refrigerant oils.
• Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption.
• Do not spill the refrigerant oil on the vehicle; it may damage the paint; if it gets on the paint, wash it off immediately.

A/C condenser	25 mL (5/6 fl.oz)
Evaporator	45 mL (1 1/2 fl.oz)
Line or hose	10 mL (1/3 fl.oz)
Receiver/Dryer	10 mL (1/3 fl.oz)
Leakage repair	25 mL (5/6 fl.oz)
A/C compressor	For A/C compressor replacement, subtract the volume of oil drained form the removed A/C compressor from 130 mL (5 1/3 fl.oz), and drain the calculated volume of oil from new A/C compressor: 130 mL (5 1/3 fl.oz) - Volume of removed A/C compressor = Volume to drain from new A/C compressor.

NOTE:

Even if no oil is drained from the removed A/C compressor, don't drain more than 50 mL (1 2/3 fl.oz) from the new A/C compressor.

Fig. 5: Identifying A/C Compressor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

A/C Line Replacement

Fig. 6: Identifying A/C Components With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.

General Troubleshooting Information

How to Check for DTCs with the HDS

1. Make sure the ignition switch is OFF.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.

   Fig. 7: Connecting HDS To DLC
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Turn the ignition switch ON (II). Make sure the HDS communicates with the vehicle and the audio-HVAC display panel. If it doesn't, troubleshoot the DLC circuit; '04-06 models (see '04-06 MODELS ), '07-08 models (see '07-08 MODELS ).
4. Select DTCs in the body electrical/climate control mode MENU of the HDS.
5. Check for DTCs. If a DTCs indicated, go to the next step. If no DTC(s) indicated, refer to SYMPTOM TROUBLESHOOTING.
6. Turn the ignition switch OFF.
7. Disconnect the HDS from the DLC.
8. Do the troubleshooting procedure for the DTC indicated.

   NOTE:

   After the troubleshooting, clear the DTCs with the HDS. For specific operations, refer to the user's manual that came with the HDS.

How to Retrieve a DTC (Without HDS)

The audio-HVAC display module has a self-diagnostic function for climate control. To run the self-diagnostic function, do the following:

NOTE:

Before troubleshooting the climate control system, refer to TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A .

1. Turn the ignition switch ON (II).
2. Press the AUTO button, and set the temperature to Lo.
3. Press and hold the OFF button. While holding the OFF button, press the rear window defogger button five times within 10 seconds. The self-diagnosis begins.

   Without navigation system

   Fig. 8: Identifying Temperature Indicator (Without Navigation System)
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   With navigation system

   Fig. 9: Identifying Temperature Indicator (With Navigation System)
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   If there is any problem in the system, the temperature indicator will light up the segment (A through Q) corresponding to the error. The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through Q). To determine the meaning of the DTC, refer to the DTC TROUBLESHOOTING INDEX.

   If there are no problems detected, the screen will go blank in about 10 seconds.

   DRIVER'S SIDE TEMPERATURE INDICATOR

   Fig. 10: Identifying Driver's Side Temperature Indicator
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   PASSENGER'S SIDE TEMPERATURE INDICATOR

   Fig. 11: Identifying Passenger's Side Temperature Indicator
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Canceling the Self-diagnostic Function

4. Turn the ignition switch OFF or press the AUTO button to cancel the self-diagnostic function. After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.

Checking DTCs by DTC Indicator

NOTE:

Before troubleshooting the climate control system, refer to TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A .

To retrieve the DTC, you must run the self-diagnostic function. In the case of multiple problems, the respective indicator segments will come on. If indicator segments A, C, E, G, I, L, and 0 come on at the same time, there maybe an open in the common ground wire of the sensors.

Fig. 12: Identifying Driver's Side And Passenger's Side Temperature Indicator
Courtesy of AMERICAN HONDA MOTOR CO., INC.

DTC TEMPERATURE CHART

DTC (Temperature Indicator Segment)	Detection Item
A	An open in the in-car temperature sensor circuit (see DTC B1225 OR DTC INDICATOR A: AN OPEN IN THE IN-CAR TEMPERATURE SENSOR CIRCUIT )
B	A short in the in-car temperature sensor circuit (see DTC B1226 OR DTC INDICATOR B: A SHORT IN THE IN-CAR TEMPERATURE SENSOR CIRCUIT )
C	An open in the outside air temperature sensor circuit (see DTC B1227 OR DTC INDICATOR C: AN OPEN IN THE OUTSIDE AIR TEMPERATURE SENSOR CIRCUIT )
D	A short in the outside air temperature sensor circuit (see DTC 1228 OR DTC INDICATOR D: A SHORT IN THE OUTSIDE AIR TEMPERATURE SENSOR CIRCUIT )
E	An open in the sunlight sensor circuit (see DTC B1229 OR DTC INDICATOR E: AN OPEN IN THE SUNLIGHT SENSOR CIRCUIT )
F	A short in the sunlight sensor circuit (see DTC B1230 OR DTC INDICATOR F: A SHORT IN THE SUNLIGHT SENSOR CIRCUIT )
G	An open in the evaporator temperature sensor circuit (see DTC B1231 OR DTC INDICATOR G: AN OPEN IN THE EVAPORATOR TEMPERATURE SENSOR CIRCUIT )
H	A short in the evaporator temperature sensor circuit (see DTC B1232 OR DTC INDICATOR H: A SHORT IN THE EVAPORATOR TEMPERATURE SENSOR CIRCUIT )
I	An open in the driver's air mix control motor circuit (see DTC B1233 OR DTC INDICATOR I: AN OPEN IN THE DRIVER'S AIR MIX CONTROL MOTOR CIRCUIT )
J	A short in the driver's air mix control motor circuit (see DTC B1234 OR DTC INDICATOR J: A SHORT IN THE DRIVER'S AIR MIX CONTROL MOTOR CIRCUIT )
K	A problem in the driver's air mix control linkage, door, or motor (see DTC B1235 OR DTC INDICATOR K: A PROBLEM IN THE DRIVER'S AIR MIX CONTROL LINKAGE, DOOR, OR MOTOR )
L	A short or open in the mode control motor circuit (see DTC B1239 OR DTC INDICATOR L: A SHORT OR OPEN IN THE MODE CONTROL MOTOR CIRCUIT )
M	A problem in the mode control linkage, doors, or motor (see DTC B1240 OR DTC INDICATOR M: A PROBLEM IN THE MODE CONTROL LINKAGE, DOORS, OR MOTOR )
N	A problem in the blower motor circuit (see DTC B1241 OR DTC INDICATOR N: A PROBLEM IN THE BLOWER MOTOR CIRCUIT )
O	An open in the passenger's air mix control motor circuit (see DTC B1236 OR DTC INDICATOR O: AN OPEN IN THE PASSENGER'S AIR MIX CONTROL MOTOR CIRCUIT )
P	A short in the passenger's air mix control motor circuit (see DTC B1237 OR DTC INDICATOR P: A SHORT IN THE PASSENGER'S AIR MIX CONTROL MOTOR CIRCUIT )
Q	A problem in the passenger's air mix control linkage, door, or motor (see DTC B1238 OR DTC INDICATOR Q: A PROBLEM IN THE PASSENGER'S AIR MIX CONTROL LINKAGE, DOOR, OR MOTOR )

Displaying Sensor Inputs at the Climate Control Unit

The climate control unit has a mode that displays sensor inputs it receives. This mode shows you what the climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is faulty.

Check these items before using the sensor input display mode:

1. Turn the ignition switch ON (II), and check the recirculation door function; press the recirculation button to switch from FRESH to RECIRC. The air volume and sound should change slightly.
2. Set the temperature control knob to the desired test temperature. When selecting the test temperatures, note these items:
   • "Lo" temperature setting will default to MAX COOL, VENT, and RECIRC.
   • "Hi" temperature setting will default to MAX HOT, FLOOR, and FRESH.
   • 61°F through 89°F settings will use the automatic climate control logic.
3. Turn the ignition switch OFF.

To run the sensor input display mode, follow these steps:

1. Turn the ignition switch OFF.
2. Press and hold both the AUTO and DUAL buttons, then start the engine.
3. After the engine starts, release the buttons. The audio-HVAC display module display will flash the sensor number and then the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the rear window defogger button.

   ITEM SPECIFICATION
   

   Sensor	Item	Displayed Value
   1	In-car Temperature	°C
   2	Outside Air Temperature	°C
   3	Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy = 10, Sunny = 65	10 kcal/m2 .h
   4	Engine Coolant Temperature	°C
   5	Evaporator Outlet Air Temperature	°C
   6	Driver's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution.)	% of opening
   7	Passenger's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution.)	% of opening
   8	Vehicle Speed (Vehicle must be driven to display speed)	km/h
   9	Vent Temperature Air Out (TAO)	°C

   NOTE:

   The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use the chart to convert the value to degrees Fahrenheit (°F). If the sensor value displays "Er" this indicates there is an open or short in the circuit or sensor. Check for DTCs using the HDS, or refer to checking DTCs by DTC indication. If necessary, compare the sensor input display to a known-good vehicle under the same test conditions. If the sensor is out of the normal range, refer to the sensor test, or substitute the sensor with a known-good, and recheck.

5. To cancel the sensor input display mode, press the AUTO button, or turn the ignition off.

Celsius to Fahrenheit Conversion Table

CELSIUS TO FAHRENHEIT CONVERSION

°C	°F	°C	°F	°C	°F	°C	°F	°C	°F
0	32	10	50	20	68	30	86	40	104
1	34	11	52	21	70	31	88	41	106
2	36	12	54	22	72	32	90	42	108
3	37	13	55	23	73	33	91	43	109
4	39	14	57	24	75	34	93	44	111
5	41	15	59	25	77	35	95	45	113
6	43	16	61	26	79	36	97	46	115
7	45	17	63	27	81	37	99	47	117
8	46	18	64	28	82	38	100	48	118
9	48	19	66	29	84	39	102	49	120

CELSIUS TO FAHRENHEIT CONVERSION

°C	°F	°C	°F	°C	°F	°C	°F	°C	°F
50	122	60	140	70	158	80	176	90	194
51	124	61	142	71	160	81	178	91	196
52	126	62	144	72	162	82	180	92	198
53	127	63	145	73	163	83	181	93	199
54	128	64	147	74	165	84	183	94	201
55	131	65	149	75	167	85	185	95	203
56	133	66	151	76	169	86	187	96	205
57	135	67	152	77	170	87	188	97	207
58	136	68	154	78	172	88	190	98	208
59	139	69	158	79	174	89	192	99	210

Alphanumeric Conversion Table

ALPHANUMERIC CONVERSION REFERENCE

Display Reading (Alphanumeric)	°C	°F
A1 thru A9	-1 thru -9	30 thru 16
B0 thru B9	-10 thru -19	14 thru -2
C0 thru C9	-20 thru -29	-4 thru -20
D0 thru D9	-30 thru -39	-22 thru -38
E0 thru E9	-40 thru -49	-40 thru-58
F0 thru F9	+100 thru +109	212 thru 226

DTC Troubleshooting Index

Checking the DTCs by HDS

DTC TROUBLESHOOTING INDEX

DTC	Detection Item or Symptom	ECU	DTC type
B1200	Communication circuit error (BUS Off)	Climate control unit	Loss of communication
B1202	Climate control unit internal error	Climate control unit	Internal error
B1205	Climate control unit lost communication with gauge control module (VSP/NE message)	Climate control unit	Loss of communication
B1206	Climate control unit lost communication with gauge control module (ECT message)	Climate control unit	Loss of communication
B1207	Climate control unit lost communication with gauge control module (ILLUMI message)	Climate control unit	Loss of communication
B1225	An open in the in-car temperature sensor circuit	Climate control unit	Signal error
B1226	A short in the in-car temperature sensor circuit	Climate control unit	Signal error
B1227	An open in the outside air temperature sensor circuit	Climate control unit	Signal error
B1228	A short in the outside air temperature sensor circuit	Climate control unit	Signal error
B1229	An open in the sunlight sensor circuit	Climate control unit	Signal error
B1230	A short in the sunlight sensor circuit	Climate control unit	Signal error
B1231	An open in the evaporator temperature sensor circuit	Climate control unit	Signal error
B1232	A short in the evaporator temperature sensor circuit	Climate control unit	Signal error
B1233	An open in the driver's air mix control motor circuit	Climate control unit	Signal error
B1234	A short in the driver's air mix control motor circuit	Climate control unit	Signal error
B1235	A problem in the driver's air mix control linkage, door, or motor	Climate control unit	Signal error
B1236	An open in the passenger's air mix control motor circuit	Climate control unit	Signal error
B1237	A short in the passenger's air mix control motor circuit	Climate control unit	Signal error
B1238	A problem in the passenger's air mix control linkage, door, or motor	Climate control unit	Signal error
B1239	A short or open in the mode control motor circuit	Climate control unit	Signal error
B1240	A problem in the mode control linkage, doors, or motor	Climate control unit	Signal error
B1241	A problem in the blower motor circuit	Climate control unit	Signal error

Symptom Troubleshooting Index

NOTE:

Before doing symptom troubleshooting, check for body DTCs (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), and powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).

DTC TROUBLESHOOTING INDEX

Symptom	Diagnostic procedure	Also check for
Recirculation control doors do not change between Fresh and Recirculate	Recirculation control motor circuit troubleshooting (see RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (7.5 A) in the under-dash fuse/relay box Cleanliness and tightness of all connectors
Blower, heater controls, and A/C do not work	Climate control power and ground circuits troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 30 (7.5 A) in the under-dash fuse/relay box Poor ground at G503 Cleanliness and tightness of all connectors
The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on)	A/C condenser fan circuit troubleshooting (see A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 9 (20 A) in the under-hood fuse/relay box, and No. 30 (7.5 A) in the under-dash fuse/relay box Poor ground at G201 Cleanliness and tightness of all connectors
Both fans do not run with the A/C on (but the A/C compressor runs with the A/C on)	Radiator and A/C condenser fans common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 9 (20 A) and No. 11 (20 A) in the under-hood fuse/relay box, and No. 30 (7.5 A) in the under-dash fuse/relay box Cleanliness and tightness of all connectors
The A/C compressor clutch does not engage (but both fans run with the A/C on)	A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Blown fuse No. 9 (20 A) in the under-hood fuse/relay box, and No. 30 (7.5 A) in the under-dash fuse/relay box Cleanliness and tightness of all connectors Blower motor operation
A/C system does not come on (both fans and the A/C compressor do not work); heater is OK	A/C pressure switch and thermal protector circuit troubleshooting (see A/C PRESSURE SWITCH AND THERMAL PROTECTER CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS ) Cleanliness and tightness of all connectors
Blower fan runs slower than expected in cold weather	('04-05 models) ECT troubleshooting (see DTC P0116: ECT SENSOR CIRCUIT RANGE/ PERFORMANCE PROBLEM ('04-05 MODELS) ) ('06-08 models) ECT sensor 2 circuit low voltage (see DTC P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE ('06-08 MODELS) ), ECT sensor 2 circuit high voltage (see DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE ('06-08 MODELS) ) NOTE: It is normal for the blower to run slowly until the engine coolant temperature begins to rise. If the blower continues to run slowly for an abnormal length of time, continue to troubleshoot the problem.	Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION )
HDS does not communicate with the climate control unit or the vehicle	Troubleshoot the DLC circuit; '04-06 models (see DLC CIRCUIT TROUBLESHOOTING ), '07-08 models (see '07-08 MODELS )
AUTO button does not work	Turn the ignition switch ON (II). Press the off button, then press the AUTO button and check the display. If AUTO is displayed, but the climate control is not working properly, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If AUTO is not displayed, check for poor connections at the climate control connector. If the connections are OK, replace the audio-HVAC display panel.	Climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )
OFF button does not work	Turn the ignition switch ON (II). Press the AUTO button, then press the OFF button and check the display. If the climate control display turns off, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the climate control display does not turn off, replace the audio-HVAC display panel.	Faulty relays (see POWER RELAY TEST )
Dual button does not work	Turn the ignition switch ON (II). Press the AUTO button, then press the DUAL button several times and check the DUAL button LED. The LED should toggle on and off as the button is pressed. If the LED turns on or off, go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the LED does not turn on or off, replace the audio-HVAC display panel.
Recirculation button does not work	Turn the ignition switch ON (II). Press the recirculation button and check the operation of the button's LED. If the LED turns on, go to RECIRCULATION CONTROL MOTOR TEST . If the LED does not turn on, replace the audio-HVAC display panel.
Defroster button does not work	Turn the ignition switch ON (II). Press the AUTO button, then press the defroster button several times and check the button's LED. The LED should toggle on and off as the button is pressed. If the LED turns on and off, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the LED does not turn on or off, replace the audio-HVAC display panel.
Rear window defogger button does not work	Turn the ignition switch ON (II). Press the rear window defogger button several times and check the button's LED. The LED should toggle on and off as the button is pressed. If the LED turns on and off, go to FUNCTION TEST rear window defogger troubleshooting . If the LED does not turn on or off, replace the audio-HVAC display panel.
MODE button does not work	Turn the ignition switch ON (II). Press the MODE button and check the display. If the display scrolls through the modes as the MODE button is pressed, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the display does not scroll through the modes as the MODE button is pressed, replace the audio-HVAC display panel.
Fan control button does not work	Turn the ignition switch ON (II). Press the AUTO button, then adjust the fan control button up/down and check the display. If the display indicates the fan speed selection up/down, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) . If the display does not indicate the fan speed selection up/down, replace the audio-HVAC display panel.
TEMP control button does not work	Turn the ignition switch ON (II). Press the AUTO button, then adjust the TEMP control button up/down and check the display. If the display indicates the change in temperature up/down, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the display does not indicate the change in temperature up/down, replace the audio-HVAC display panel.
Passenger's TEMP button does not work	Turn the ignition switch ON (II). Press the AUTO button. Press the Dual button then the passenger's TEMP button up/down and check the display. If the display indicates the change in temperature up/down for the passenger's side, check for DTCs with the HDS (see HOW TO CHECK FOR DTCS WITH THE HDS ), or go to HOW TO RETRIEVE A DTC (WITHOUT HDS) self-diagnosis . If the display does not indicate the change in temperature up/down, replace the audio-HVAC display panel.
Climate control does not work with voice control (with navigation)	Voice control troubleshooting, '04-05 models (see VOICE CONTROL DOES NOT WORK/RESPOND ), '06-08 models (see VOICE CONTROL DOES NOT WORK/RESPOND ).
Climate control will not run self-diagnosis	Turn the ignition switch ON (II). Press the AUTO button, then the TEMP control button up/down and check the display If the display does not work, check for loose or poor connections at the audio-HVAC display module, and recheck. If the connections are OK, and the display still does not work, go to CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING .
More than one button is not working	Climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )	HVAC DTCs (see HOW TO CHECK FOR DTCS WITH THE HDS )
Audio-HVAC display/button illumination problems	Audio-HVAC display module illumination troubleshooting (see AUDIO-HVAC DISPLAY MODULE ILLUMINATION TROUBLESHOOTING )

System Description

The air conditioning system removes heat from the passenger compartment by transferring heat from the ambient air to the evaporator. The evaporator cools the air with the refrigerant that is circulating through the evaporator. The refrigerant expands in the evaporator, and the evaporator becomes very cold and absorbs the heat from the ambient air. The blower fan pushes air across the evaporator where the heat is absorbed, and then it blows the cool air into the passenger compartment.

Fig. 13: Air Conditioning Flow Diagram
Courtesy of AMERICAN HONDA MOTOR CO., INC.

This vehicle uses HFC-134a (R-134a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the following service items:

• Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
• Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (SP-10) designed for the R-134a A/C compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in A/C compressor failure.
• All A/C system parts (A/C compressor, discharge line, suction line, evaporator, A/C condenser, receiver/dryer, expansion valve, O-rings for joints) are designed for refrigerant R-134a. Do not exchange with R-12 parts.
• Use a halogen gas leak detector designed for refrigerant R-134a.
• R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service the R-134a air conditioning systems.
• Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any A/C fitting.

Climate Control Door Positions

Fig. 14: Climate Control Door Positions Chart (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig. 15: Climate Control Door Positions Chart (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Dual Air Mix Control System

Fig. 16: Dual Air Mix Control System Chart (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig. 17: Dual Air Mix Control System Chart (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Climate Control Unit Inputs and Outputs

Fig. 18: Identifying Audio-HVAC Display Panel Connectors Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE:

For audio-HVAC display panel connector location, go to SYSTEM DESCRIPTION Audio Unit Connector Replacement; with navigation , without navigation (see AUDIO UNIT CONNECTOR INPUTS AND OUTPUTS ).

CONNECTOR A (o on Circuit Diagram)

CONNECTOR A (o ON CIRCUIT DIAGRAM)

Cavity	Wire color	Signal
1	PNK/BLK(1) PNK(2)	DRIVER'S AIR MIX POTENTIAL	INPUT
2	YEL(1) WHT(2)	PASSENGER'S AIR MIX POTENTIAL	INPUT
3	-	-	-
4	-	-	-
5	BLU(1) LT GRN(2)	A/C PRESSURE SWITCH	OUTPUT
6	YEL/BLU(1) PUR(2)	MODE DEF	OUTPUT
7	YEL/RED(1) LT GRN(2)	MODE VENT	OUTPUT
8	GRN	DRIVER'S AIR MIX COOL	OUTPUT
9	PNK/BLU(1) BLU(2)	DRIVER'S AIR MIX HOT	OUTPUT
10	YEL/BLK(1) ORN(2)	PASSENGER'S AIR MIX COOL	OUTPUT
11	LT BLU(1) GRY(2)	IN-CAR TEMPERATURE SENSOR	INPUT
12	PNK(1) RED(2)	OUTSIDE AIR TEMPERATURE SENSOR	INPUT
13	ORN	SUNLIGHT SENSOR	INPUT
14	BRN	EVAPORATOR TEMPERATURE SENSOR	INPUT
15	RED/BLK(1) RED(2)	SENSOR COMMON GROUND	OUTPUT
16	YEL/GRN(1) YEL(2)	MODE 4	INPUT
17	WHT/BLU(1) WHT(2)	MODE 3	INPUT
18	RED/BLU(1) LT BLU(2)	MODE 2	INPUT
19	RED/YEL(1) RED(2)	MODE 1	INPUT
20	GRY	AIR MIX POTENTIAL +5 V	OUTPUT
21	-	-	-
22	LT GRN	PASSENGER'S AIR MIX HOT	OUTPUT
(1) '04 model (2) '05-08 models

CONNECTOR B ([] on Circuit Diagram)

CONNECTOR B ([] ON CIRCUIT DIAGRAM)

Cavity	Wire color	Signal
1	BLU/YEL(1) LT GRN(2)	POWER TRANSISTOR CONTROL	OUTPUT
2	BLU/RED(1) PUR(2)	BLOWER FEEDBACK	INPUT
3	-	-	-
4	BLK/YEL(1) YEL(2)	IG2 (Power)	INPUT
5	-	-	-
6	BLK	GROUND (G503)	INPUT
7	-	-	-
8	RED/BLK	TAILLIGHT RELAY	INPUT
9	-	-	-
10	GRN/WHT(1) GRN(2)	FRESH	OUTPUT
11	LT GRN/RED(1) ORN(2)	RECIRCULATE	OUTPUT
12	RED	GAUGE ASSEMBLY	OUTPUT
13	-	-	-
14	LT BLU	GAUGE CONTROL MODULE	INPUT
15	-	-	-
16	-	-	-
(1) '04 model (2) '05-08 models

Circuit Diagram

Fig. 19: Climate Control Circuit Diagram (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig. 20: Climate Control Circuit Diagram (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

DTC Troubleshooting

DTC B1225 or DTC indicator A: An Open in the In-car Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1225 or A indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the in-car temperature sensor circuit.

5. Turn the ignition switch OFF.
6. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR TEST ) and test it (see IN-CAR TEMPERATURE SENSOR TEST ).

   Is the in-car temperature sensor OK?

   YES - Go to step 7.

   NO - Replace the in-car temperature sensor.

7. Disconnect audio-HVAC display panel connector A (22P).
8. Check for continuity between the No. 11 terminal of audio-HVAC display panel connector A (22P) and the No. 2 terminal of the in-car temperature sensor 2P connector.

   Fig. 21: Checking Continuity Between 11 Terminal Of Audio-Hvac Display Panel Connector A (22P) And Temperature Sensor 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 9.

   NO - Repair open in the wire between the audio-HVAC display panel and the in-car temperature sensor.

9. Check for continuity between the No. 15 terminal of audio-HVAC display panel connector A (22P) and the No. 1 terminal of the in-car temperature sensor 2P connector.

   Fig. 22: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And In-Car Temperature Sensor 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Check for loose wires or poor connections at audio-HVAC display panel connector A (22P) and at the in-car temperature sensor 2P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

   NO - Repair open in the wire between the audio-HVAC display panel and the in-car temperature sensor.

DTC B1226 or DTC indicator B: A Short in the In-car Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1226 or B indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR TEST ).
7. Test the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR TEST ).

   Is the in-car temperature sensor OK?

   YES - Go to step 8.

   NO - Replace the in-car temperature sensor.

8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the No. 11 terminal of audio-HVAC display panel connector A (22P) and body ground.

   Fig. 23: Checking Continuity Between 11 Terminal Of Audio-HVAC Display Panel Connector A (22P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire between the audio-HVAC display panel and the in-car temperature sensor.

   NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1227 or DTC indicator C: An Open in the Outside Air Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1227 or C indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the outside air temperature sensor circuit.

5. Turn the ignition switch OFF.
6. Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR TEST ) and test it (see OUTSIDE AIR TEMPERATURE SENSOR TEST ).

   Is the outside air temperature sensor OK?

   YES - Go to step 7.

   NO - Replace the outside air temperature sensor.

7. Disconnect audio-HVAC display panel connector A (22P).
8. Check for continuity between the No. 12 terminal of audio-HVAC display panel connector A (22P) and the No. 1 terminal of the outside air temperature sensor 2P connector.

   Fig. 24: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Outside Air Temperature Sensor 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 9.

   NO - Repair open in the wire between the audio-HVAC display panel and the outside air temperature sensor.

9. Check for continuity between the No. 15 terminal of audio-HVAC display panel connector A (22P) and the No. 2 terminal of the outside air temperature sensor 2P connector.

   Fig. 25: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Outside Air Temperature Sensor 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Check for loose wires or poor connections at audio-HVAC display panel connector A (22P) and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

   NO - Repair open in the wire between the audio-HVAC display panel and the outside air temperature sensor.

DTC B1228 or DTC indicator D: A Short in the Outside Air Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   /s DTC B1228 or D indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR TEST ).
7. Test the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR TEST ).

   Is the outside air temperature sensor OK?

   YES - Go to step 8.

   NO - Replace the outside air temperature sensor.

8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the No. 12 terminal of audio-HVAC display panel connector A (22P) and body ground.

   Fig. 26: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire between the audio-HVAC display panel and the outside air temperature sensor.

   NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1229 or DTC indicator E: An Open in the Sunlight Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1229 or E indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the sunlight sensor circuit.

5. Turn the ignition switch OFF.
6. Test the sunlight sensor (see SUNLIGHT SENSOR TEST ).

   Is the sunlight sensor OK?

   YES - Go to step 7.

   NO - Replace the sunlight sensor (see SUNLIGHT SENSOR TEST ).

7. Disconnect the sunlight sensor 2P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the No. 13 terminal of audio-HVAC display panel connector A (22P) and the No. 1 terminal of the sunlight sensor 2P connector.

   Fig. 27: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Sunlight Sensor 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 10.

   NO - Repair open in the wire between the audio-HVAC display panel and the sunlight sensor.

10. Check for continuity between the No. 15 terminal of audio-HVAC display panel connector A (22P) and the No. 2 terminal of the sunlight sensor 2P connector.

    Fig. 28: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Sunlight Sensor 2P Connector
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Check for loose wires or poor connections at audio-HVAC display panel connector A (22P) and at the sunlight sensor 2P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/ indication goes away, replace the original audio-HVAC display panel.

    NO - Repair open in the wire between the climate control unit and the sunlight sensor.

DTC B1230 or DTC indicator F: A Short in the Sunlight Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1230 or F indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Test the sunlight sensor (see SUNLIGHT SENSOR TEST ).

   Is the sunlight sensor OK?

   YES - Go to step 7.

   NO - Replace the sunlight sensor (see SUNLIGHT SENSOR TEST ).

7. Disconnect the sunlight sensor 2P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the No. 13 terminal of audio-HVAC display panel connector A (22P) and body ground.

   Fig. 29: Checking Continuity Between No. 13 Terminal Of Audio-Hvac Display Panel Connector A (22P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire between the audio-HVAC display panel and the sunlight sensor.

   NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1231 or DTC indicator G: An Open in the Evaporator Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1231 or G indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the evaporator temperature sensor circuit.

5. Turn the ignition switch OFF.
6. Remove the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR REPLACEMENT ) and test it (see EVAPORATOR TEMPERATURE SENSOR TEST ).

   Is the evaporator temperature sensor OK?

   YES - Go to step 7.

   NO - Replace the evaporator temperature sensor.

7. Disconnect audio-HVAC display panel connector A (22P).
8. Check for continuity between the No. 14 terminal of audio-HVAC display panel connector A (22P) and the No. 1 terminal of the evaporator temperature sensor 2P connector.

   Fig. 30: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Evaporator Temperature Sensor 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 9.

   NO - Repair open in the wire between the audio-HVAC display panel and the evaporator temperature sensor.

9. Check for continuity between the No. 15 terminal of audio-HVAC display panel connector A (22P) and the No. 2 terminal of the evaporator temperature sensor 2P connector.

   Fig. 31: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Evaporator Temperature Sensor 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Check for loose wire or poor connections at audio-HVAC display panel connector A (22P) and at the evaporator temperature sensor 2P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

   NO - Repair open in the wire between the audio-HVAC display panel and the evaporator temperature sensor.

DTC B1232 or DTC indicator H: A Short in the Evaporator Temperature Sensor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1232 or H indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Remove the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR REPLACEMENT ).
7. Test the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR TEST ).

   Is the evaporator temperature sensor OK?

   YES - Go to step 8.

   NO - Replace the evaporator temperature sensor.

8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the No. 14 terminal of audio-HVAC display panel connector A (22P) and body ground.

   Fig. 32: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire between the audio-HVAC display panel and the evaporator temperature sensor.

   NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1233 or DTC indicator I: An Open in the Driver's Air Mix Control Motor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1233 or I indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the driver's air mix control motor circuit.

5. Turn the ignition switch OFF.
6. Test the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ).

   Is the driver's air mix control motor OK?

   YES - Go to step 7.

   NO - Replace the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ).

7. Disconnect the driver's air mix control motor 7P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the following terminals of audio-HVAC display panel connector A (22P) and the driver's air mix control motor 7P connector.

   22P	7P
   No. 1	No. 3
   No. 15	No. 5
   No. 20	No. 7

   Fig. 33: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Driver's Air Mix Control Motor 7P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Check for loose wires or poor connections at audio-HVAC display panel connector A (22P) and at the driver's air mix control motor 7P connector. If the connections are good, substitute a known-good audio-HVAC display panel and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

   NO - Repair open in the wire(s) between the audio-HVAC display panel and the driver's air mix control motor.

DTC B1234 or DTC indicator J: A Short in the Driver's Air Mix Control Motor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1234 or J indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Test the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ).

   Is the driver's air mix control motor OK?

   YES - Go to step 7.

   NO - Replace the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ).

7. Disconnect the driver's air mix control motor 7P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals No. 1 and No. 20 individually.

   Fig. 34: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 1 And 20
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire(s) between the audio-HVAC display panel and the driver's air mix control motor.

   NO - Go to step 10.

10. Turn the ignition switch ON (II), and measure the voltage at the same terminals.

    Fig. 35: Measuring Connector Terminal Voltage
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Are there any voltage?

    YES - Repair short to power in the wire(s) between the audio-HVAC display panel and the driver's air mix control motor. This short also damages the audio-HVAC display panel. Repair the short to power before replacing the audio-HVAC display panel.

    NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1235 or DTC indicator K: A Problem in the Driver's Air Mix Control Linkage, Door, or Motor

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1235 or K indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Test the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ).

   Are the driver's air mix control motor and linkage OK?

   YES - Go to step 7.

   NO - Replace the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR TEST ), or repair the driver's air mix control linkage or door.

7. Disconnect driver's air mix control motor 7P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the following terminals of audio-HVAC display panel connector A (22P) and driver's air mix control motor 7P connector.

   22P	7P
   No. 8	No. 1
   No. 9	No. 2

   Fig. 36: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Driver's Air Mix Control Motor 7P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 10.

   NO - Repair open in the wire(s) between the audio-HVAC display panel and the driver's air mix control motor.

10. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals No. 8 and No. 9 individually.

    Fig. 37: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 8 And 9
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair open in the wire(s) between the audio-HVAC display panel and the driver's air mix control motor.

    NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1239 or DTC indicator L: A Short or Open in the Mode Control Motor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1239 or L indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the mode control motor circuit.

5. Turn the ignition switch OFF.
6. Test the mode control motor (see MODE CONTROL MOTOR TEST ).

   Is the mode control motor OK?

   YES - Go to step 7.

   NO - Replace the mode control motor (see MODE CONTROL MOTOR REPLACEMENT ).

7. Disconnect mode control motor 7P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the body ground and audio-HVAC display panel connector A (22P) terminals No. 16,17,18, and 19 individually.

   Fig. 38: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals No. 16,17,18, And 19
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire(s) between the audio-HVAC display panel and the mode control motor.

   NO - Go to step 10.

10. Turn the ignition switch ON (II), and measure the voltage at the same terminals.

    Fig. 39: Measuring Connector Voltage
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Are there any voltage?

    YES - Repair short to power in the wire(s) between the audio-HVAC display panel and the mode control motor. This short may also damage the audio-HVAC display panel. Repair the short to power before replacing the audio-HVAC display panel.

    NO - Go to step 11.

11. Turn the ignition switch OFF, and check for continuity between the following terminals of audio-HVAC display panel connector A (22P) and mode control motor 7P connector.

    22P	7P
    No. 15	No. 7
    No. 16	No. 3
    No. 17	No. 4
    No. 18	No. 5
    No. 19	No. 6

    Fig. 40: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Mode Control Motor 7P Connector
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Check for loose wires or poor connections at audio-HVAC display panel connector A (22P) and at the mode control motor 7P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

    NO - Repair open in the wire(s) between the audio-HVAC display panel and the mode control motor.

DTC B1240 or DTC indicator M: A Problem in the Mode Control Linkage, Doors, or Motor

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1240 or M indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Test the mode control motor (see MODE CONTROL MOTOR TEST ).

   Are the mode control motor and linkage OK?

   YES - Go to step 7.

   NO - Replace the mode control motor (see MODE CONTROL MOTOR REPLACEMENT ), or repair the mode control linkage or doors.

7. Disconnect mode control motor 7P connector.
8. Disconnect climate control unit connector A (22P).
9. Check for continuity between the following terminals of audio-HVAC display panel connector A (22P) and mode control motor 7P connector.

   22P	7P
   No. 6	No. 1
   No. 7	No. 2

   Fig. 41: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Mode Control Motor 7P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 10.

   NO - Repair open in the wire(s) between the audio-HVAC display panel and the mode control motor.

10. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals No. 6 and No. 7 individually.

    Fig. 42: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 6 And 7
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair short to body ground in the wire(s) between the audio-HVAC display panel and the mode control motor.

    NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1241 or DTC indicator N: A Problem in the Blower Motor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1241 or N indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the blower motor circuit.

5. Turn the ignition switch OFF.
6. Check the No. 21 (40 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.

   Are the fuses OK?

   YES - Go to step 7.

   NO - Replace the fuse(s), and recheck.

7. Connect the No. 2 terminal of the blower motor 2P connector to body ground with a jumper wire.

   Fig. 43: Connecting Blower Motor 2P Connector To Body Ground With Jumper Wire
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Turn the ignition switch ON (II).

   Does the blower motor run?

   YES - Go to step 9.

   NO - Go to step 22.

9. Turn the ignition switch OFF.
10. Disconnect the jumper wire.
11. Disconnect power transistor 4P connector.
12. Check for continuity between the No. 2 terminal of the power transistor 4P connector and body ground.

    Fig. 44: Checking Continuity Between No. 2 Terminal Of Power Transistor 4P Connector And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 13.

    NO - Check for an open in the wire between the power transistor and body ground. If the wire is OK, check for poor ground at G503.

13. Connect the No. 2 and No. 4 terminals of the power transistor 4P connector with a jumper wire.

    Fig. 45: Connecting No. 2 And No. 4 Terminals Of Power Transistor 4P Connector With Jumper Wire
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

14. Turn the ignition switch ON (II).

    Does the blower motor run at high speed?

    YES - Go to step 15.

    NO - Repair open in the BLU/BLK wire between the power transistor and the blower motor.

15. Turn the ignition switch OFF.
16. Disconnect the jumper wire.
17. Disconnect audio-HVAC display panel connector B (16P).
18. Check for continuity between the No. 1 and No. 2 terminals of audio-HVAC display panel connector B (16P) and body ground individually.

    Fig. 46: Checking Continuity Between 1 And 2 Terminals Of Audio-Hvac Display Panel Connector B (16P) And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair short to body ground in the wire(s) between the audio-HVAC display panel and the power transistor.

    NO - Go to step 19.

19. Check for continuity between the following terminals of audio-HVAC display panel connector B (16P) and power transistor 4P connector.

    16P	4P
    No. 1	No. 1
    No. 2	No. 3

    Fig. 47: Checking Continuity Between Audio-HVAC Display Panel Connector B (16P) And Power Transistor 4P Connector
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 20.

    NO - Repair open in the wire(s) between the audio-HVAC display panel and the power transistor.

20. Reconnect audio-HVAC display panel connector B (16P).
21. Test the power transistor (see POWER TRANSISTOR TEST ).

    Is the power transistor OK?

    YES - Check for loose wire or poor connections at audio-HVAC display panel connector B (16P) and at the power transistor 4P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

    NO - Replace the power transistor.

22. Turn the ignition switch OFF.
23. Disconnect the jumper wire.
24. Disconnect blower motor 2P connector.
25. Turn the ignition switch ON (II).
26. Measure the voltage between the No. 1 terminal of blower motor 2P connector and body ground.

    Fig. 48: Measuring Voltage Between No. 1 Terminal Of Blower Motor 2P Connector And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Replace the blower motor (see BLOWER UNIT COMPONENT REPLACEMENT ).

    NO - Go to step 27.

27. Turn the ignition switch OFF.
28. Remove the blower motor relay from the under-hood fuse/relay box, and test it (see POWER RELAY TEST ).

    Is there relay OK?

    YES - Go to step 29.

    NO - Replace the blower motor relay.

29. Measure the voltage between the No. 2 terminal of the blower motor relay 4P socket and body ground.

    Fig. 49: Measuring Voltage Between No. 2 Terminal Of Blower Motor Relay 4P Socket And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 30.

    NO - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

30. Turn the ignition switch ON (II).
31. Measure the voltage between the No. 4 terminal of blower motor relay 4P socket and body ground.

    Fig. 50: Measuring Voltage Between No. 4 Terminal Of Blower Motor Relay 4P Socket And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 32.

    NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box and the blower motor relay.

32. Turn the ignition switch OFF.
33. Check for continuity between the No. 3 terminal of blower motor relay 4P socket and body ground.

    Fig. 51: Checking Continuity Between Blower Motor Relay 4P Socket And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair open in the WHT/BLU wire between the blower motor relay and the blower motor.

    NO - Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G302.

DTC B1236 or DTC indicator O: An Open in the Passenger's Air Mix Control Motor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1236 or O indicated?

   YES - Go to step 5.

   NO - Intermittent failure, check for loose wires or poor connections on the passenger's air mix control motor circuit.

5. Turn the ignition switch OFF.
6. Test the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR TEST ).

   Is the passenger's air mix control motor OK?

   YES - Go to step 7.

   NO - Replace the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT ).

7. Disconnect the passenger's air mix control motor 7P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the following terminals of audio-HVAC display panel connector A (22P) and the passenger's air mix control motor 7 P connector.

   22P	7P
   No. 2	No. 3
   No. 15	No. 5
   No. 20	No. 7

   Fig. 52: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Passenger's Air Mix Control Motor 7 P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Check for loose wire or poor connections at audio-HVAC display panel connector A (22P) and at the passenger's air mix control motor 7P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

   NO - Repair open in the wire(s) between the audio-HVAC display panel and the passenger's air mix control motor.

DTC B1237 or DTC indicator P: A Short in the Passenger's Air Mix Control Motor Circuit

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1237 or P indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Test the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR TEST ).

   Is the passenger's air mix control motor OK?

   YES - Go to step 6.

   NO - Replace the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT ).

7. Disconnect the passenger's air mix control motor 7P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals No. 2 and No. 20 individually.

   Fig. 53: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 2 And 20
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire(s) between the audio-HVAC display panel and the passenger's air mix control motor.

   NO - Go to step 10.

10. Turn the ignition switch ON (II), and measure the voltage at the same terminals.

    Fig. 54: Measuring Voltage Of Connector Terminals
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Are there any voltage?

    YES - Repair short to power in the wire(s) between the audio-HVAC display panel and the passenger's air mix control motor. This short also may damage the audio-HVAC display panel. Repair the short to power before replacing the audio-HVAC display panel.

    NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1238 or DTC indicator Q: A Problem in the Passenger's Air Mix Control Linkage, Door, or Motor

1. Clear the DTC.
2. Turn the ignition switch OFF, and then ON (II).
3. Operate the climate control system in several modes.
4. Check the DTCs.

   Is DTC B1238 or Q indicated?

   YES - Go to step 5.

   NO - Intermittent failure.

5. Turn the ignition switch OFF.
6. Test the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR TEST ).

   Are the passenger's air mix control motor and linkage OK?

   YES - Go to step 7.

   NO - Replace the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT ), or repair the passenger's air mix control linkage or door.

7. Disconnect the passenger's air mix control motor 7P connector.
8. Disconnect audio-HVAC display panel connector A (22P).
9. Check for continuity between the following terminals of audio-HVAC display panel connector A (22P) and the passenger's air mix control motor 7P connector.

   22P	7P
   No. 10	No. 1
   No. 22	No. 2

   Fig. 55: Checking Continuity Between Audio-HVAC Display Panel Connector A (22P) And Passenger's Air Mix Control Motor 7P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 10.

   NO - Repair open in the wire(s) between the audio-HVAC display panel and the passenger's air mix control motor.

10. Check for continuity between body ground and audio-HVAC display panel connector A (22P) terminals No. 10 and No. 22 individually.

    Fig. 56: Checking Continuity Between Body Ground And Audio-HVAC Display Panel Connector A (22P) Terminals 10 And 22
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair open in the wire(s) between the audio-HVAC display panel and the passenger's air mix control motor.

    NO - Substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

DTC B1202: Climate Control Unit Internal Error

1. Clear the DTCs using the HDS.
2. Turn the ignition switch OFF, and then ON (II).
3. Turn the climate control system on and operate several functions (A/C on/off, air mix and blend door operations, temperature settings etc.).
4. Check the DTCs by selecting the DTC MENU (DTCs) from the HDS.

   Is DTC B1202 indicated?

   YES - The audio-HVAC display panel is faulty, replace the audio-HVAC display panel.

   NO - Intermittent failure, the audio-HVAC display panel is OK at this time. Check for loose or poor connections at audio-HVAC display panel connector A (22P). If the connections are good, check the battery condition (see BATTERY TEST ), and the charging system (see ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING ).

DTC B1205: Climate Control Unit Lost Communication with the Gauge Control Module (VSP/NE messages); DTC B1206: Climate Control Unit Lost Communication with the Gauge Control Module (ECT messages); DTC B1207: Climate Control Unit Lost Communication with the Gauge Control Module (ILLUMI messages)

1. Turn the ignition switch ON (II).
2. Push the AUTO button.

   Does the climate control turn on?

   YES - Go to step 2.

   NO - Go to CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING .

3. Clear the DTCs using the HDS.
4. Turn the ignition switch OFF, and then ON (II).
5. Turn the climate control system on and operate several functions (A/C on/off, air mix and blend door operations, temperature settings etc.).
6. Check the DTCs by selecting the DTCs MENU (DTCs) from the HDS.

   Is DTC B1205, B1206 and/or B1207 indicated?

   YES - Go to step 7.

   NO - Intermittent failure, the gauge control module and audio-HVAC display panel are OK at this time.

7. Check the DTCs by selecting the DTCs MENU (DTCs) from the HDS.

   Is DTC B1008, B1060 and/or B1061 indicated?

   YES - Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).

   NO - Go to step 8.

8. Turn the ignition switch OFF.
9. Disconnect audio-HVAC display panel connector B (16P).
10. Disconnect the under-dash fuse/relay box connector N (45P) from the fuse/relay box.
11. Check for continuity between the No. 22 terminal of under-dash fuse/relay box connector N (45P) and the No. 14 terminal of audio-HVAC display panel connector B (16P).

    Fig. 57: Checking Continuity Between Under-Dash Fuse/Relay Box Connector N (45P) And Audio-HVAC Display Panel Connector B (16P)
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - The gauge control module and/or climate control unit faulty. Substitute one component at a time and recheck. Replace the component that eliminates the DTC/symptom.

    NO - Repair open in the wire between the gauge control module and the audio-HVAC display panel.

Recirculation Control Motor Circuit Troubleshooting

1. Check the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.

   Is the fuse OK?

   YES - Go to step 2.

   NO - Replace the fuse, and recheck.

2. Disconnect the recirculation control motor 7P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 1 terminal of recirculation control motor 7P connector and body ground.

   Fig. 58: Measuring Voltage Between No. 1 Terminal Of Recirculation Control Motor 7P Connector And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage?

   YES - Go to step 5.

   NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the recirculation control motor.

5. Turn the ignition switch OFF.
6. Test the recirculation control motor (see RECIRCULATION CONTROL MOTOR TEST ).

   Are the recirculation control motor and linkage OK?

   YES - Go to step 7.

   NO - Replace the recirculation control motor (see RECIRCULATION CONTROL MOTOR TEST ), or repair the recirculation control linkage or doors.

7. Disconnect audio-HVAC display panel connector B (16P).
8. Check for continuity between the No. 10 and No. 11 terminals of audio-HVAC display panel connector B (16P) and body ground individually.

   Fig. 59: Checking Continuity Between 10 And 11 Terminals Of Audio-HVAC Display Panel Connector B (16P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Repair short to body ground in the wire(s) between the audio-HVAC display panel and the recirculation control motor.

   NO - Go to step 9.

9. Turn the ignition switch ON (II), and measure the voltage at the same wires.

   Fig. 60: Measuring Voltage Of Connector Terminals
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Are there any voltage?

   YES - Repair short to power in the wire(s) between the audio-HVAC display panel and the recirculation control motor. This short may also damage the audio-HVAC display panel. Repair the short to power before replacing the audio-HVAC display panel.

   NO - Go to step 10.

10. Turn the ignition switch OFF.
11. Check for continuity between the following terminals of audio-HVAC display panel connector B (16P) and the recirculation control motor 7P connector.

    16P	7P
    No. 10	No. 5
    No. 11	No. 7

    Fig. 61: Checking Continuity Between Terminals Of Audio-HVAC Display Panel Connector B (16P) And Recirculation Control Motor 7P Connector
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Check for loose wire or poor connections at audio-HVAC display panel connector B (16P) and at recirculation control motor 7P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

    NO - Repair open in the wire(s) between the audio-HVAC display panel and the recirculation control motor.

Climate Control Power and Ground Circuit Troubleshooting

1. Check the No. 30(7.5 A) fuse in the under-dash fuse/relay box.

   Is the fuse OK?

   YES - Go to step 2.

   NO - Replace the fuse, and recheck.

2. Disconnect audio-HVAC display panel connector B (16P).
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 4 terminal of audio-HVAC display panel connector B (16P) and body ground.

   Fig. 62: Measuring Voltage Between 4 Terminal Of Audio-HVAC Display Panel Connector B (16P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage?

   YES - Go to step 5.

   NO - Repair open in the wire between the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box and the audio-HVAC display panel.

5. Turn the ignition switch OFF.
6. Check for continuity between the No. 6 terminal of audio-HVAC display panel connector B (16P) and body ground.

   Fig. 63: Checking Continuity Between 6 Terminal Of Audio-HVAC Display Panel Connector B (16P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Check for loose wires or poor connections at audio-HVAC display panel connector B (16P). If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away> replace the original audio-HVAC display panel.

   NO - Check for an open in the wire between the audio-HVAC display panel and body ground. If the wire is OK, check for poor ground at G503.

A/C Condenser Fan Circuit Troubleshooting

NOTE:

Do not use this troubleshooting procedure if the radiator fan and/or the A/C compressor is inoperative, refer to the SYMPTOM TROUBLESHOOTING INDEX.

1. Check the No. 9 (20 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.

   Are the fuses OK?

   YES - Go to step 2.

   NO - Replace the fuse(s), and recheck.

2. Remove the A/C condenser fan relay from the under-hood fuse/relay box, and test it (see POWER RELAY TEST ).

   Is the relay OK?

   YES - Go to step 3.

   NO - Replace the A/C condenser fan relay.

3. Measure the voltage between the No. 1 terminal of the A/C condenser fan relay 4P socket and body ground.

   Fig. 64: Measuring Voltage Between No. 1 Terminal Of A/C Condenser Fan Relay 4P Socket And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage?

   YES - Go to step 4.

   NO - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

4. Connect the No. 1 and No. 2 terminals of the A/C condenser fan relay 4P socket with a jumper wire.

   Fig. 65: Connecting No. 1 And No. 2 Terminals Of A/C Condenser Fan Relay 4P Socket With Jumper Wire
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Does the A/C condenser fan run?

   YES - Go to step 5.

   NO - Go to step 8.

5. Disconnect the jumper wire.
6. Turn the ignition switch ON (II).
7. Measure the voltage between the No. 3 terminal of the A/C condenser fan relay 4P socket and body ground.

   Fig. 66: Measuring Voltage Between No. 3 Terminal Of A/C Condenser Fan Relay 4P Socket And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage?

   YES - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

   NO - Repair open in the BLK/YEL wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the A/C condenser fan relay.

8. Disconnect the jumper wire.
9. Disconnect A/C condenser fan 2P connector.
10. Check for continuity between the No. 2 terminal of A/C condenser fan relay 4P socket and the No. 2 terminal of A/C condenser fan 2P connector.

    Fig. 67: Checking Continuity Between A/C Condenser Fan Relay 4P Socket And A/C Condenser Fan 2P Connector
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 11.

    NO - Repair open in the wire between the A/C condenser fan relay and the A/C condenser fan.

11. Check for continuity between the No. 1 terminal of the A/C condenser fan 2P connector and body ground.

    Fig. 68: Checking Continuity Between No. 1 Terminal Of A/C Condenser Fan 2P Connector And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Replace the A/C condenser fan motor.

    NO - Check for an open in the wire between the A/C condenser fan and body ground. If the wire is OK, check for poor ground at G201.

Radiator and A/C Condenser Fan Common Circuit Troubleshooting

NOTE:

Do not use this troubleshooting procedure if only one fan is inoperative, or if the A/C compressor is inoperative, refer to the SYMPTOM TROUBLESHOOTING INDEX.

1. Check the No. 9 (20 A) and No. 11 (20 A) fuses in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.

   Are the fuses OK?

   YES - Go to step 2.

   NO - Replace the fuse(s), and recheck.

2. Remove the A/C condenser fan relay from the under-hood fuse/relay box.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 3 terminal of the A/C condenser fan relay 4P socket and body ground.

   Fig. 69: Measuring Voltage Between No. 3 Terminal Of A/C Condenser Fan Relay 4P Socket And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage?

   YES - Go to step 5.

   NO - Repair open in the BLK/YEL wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the A/C condenser fan relay.

5. Turn the ignition switch OFF.
6. Reinstall the A/C condenser fan relay.
7. Make sure the A/C switch is OFF, and the engine coolant temperature is below 199 °F (93 °C).
8. Turn the ignition switch ON (II).
9. Using a backprobe set, measure the voltage between the No. 12 terminal of ECM/PCM connector E (31P) and body ground with the ECM/PCM connectors connected.

   Fig. 70: Measuring Voltage Between No. 12 Terminal Of ECM/PCM Connector E (31P) And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage?

   YES - Check for loose wires or poor connections at terminal E12 of the ECM/PCM connector E (31P). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM; '04-05 models (see '04-05 MODELS ), '06-08 models (see '06-08 MODELS ).

   NO - Repair open in the wire between the radiator fan relay, the A/C condenser fan relay, and the ECM/PCM.

A/C Compressor Clutch Circuit Troubleshooting

NOTE:

Do not use this troubleshooting procedure if the fans are also inoperative, refer to the SYMPTOM TROUBLESHOOTING INDEX.

1. Check the No. 9 (20 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.

   Are the fuses OK?

   YES - Go to step 2.

   NO - Replace the fuse(s), and recheck.

2. Connect the HDS to the DLC.
3. Start the engine.
4. Turn on the A/C.
5. Using the HDS, confirm the following values in the PGM-FI Data List at idle.

   DATA LIST REFERENCE
   

   TP SENSOR	About 0.5 V
   RPM	More than 650
   ECT SENSOR 2	Normal range at idle
   A/C SWITCH	ON
   A/C CLUTCH	ON

   Are all the values within specifications?

   YES - Go to step 6.

   NO - Troubleshoot the value that is not within the specifications.

6. Turn the ignition switch OFF.
7. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it (see POWER RELAY TEST ).

   Is the relay OK?

   YES - Go to step 8.

   NO - Replace the A/C compressor clutch relay.

8. Measure the voltage between the No. 1 terminal of A/C compressor clutch relay 4P socket and body ground.

   Fig. 71: Measuring Voltage Between No. 1 Terminal Of A/C Compressor Clutch Relay 4P Socket And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there battery voltage?

   YES - Go to step 9.

   NO - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

9. Connect the No. 1 and No. 2 terminals of the A/C compressor clutch relay 4P socket with a jumper wire.

   Fig. 72: Connecting No. 1 And No. 2 Terminals Of A/C Compressor Clutch Relay 4P Socket With Jumper Wire
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Does the A/C compressor clutch click?

   YES - Go to step 10.

   NO - Go to step 18.

10. Disconnect the jumper wire.
11. Turn the ignition switch ON (II).
12. Measure the voltage between the No. 4 terminal of A/C compressor clutch relay 4P socket and body ground.

    Fig. 73: Measuring Voltage Between No. 4 Terminal Of A/C Compressor Clutch Relay 4P Socket And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 13.

    NO - Repair open in the BLK/YEL wire between the No. 30 (7.5 A) fuse in the under-dash fuse/relay box and the A/C compressor clutch relay.

13. Turn the ignition switch OFF.
14. Reinstall the A/C compressor clutch relay.
15. Turn the ignition switch ON (II).
16. Make sure the A/C switch is OFF.
17. Using a backprobe set, measure the voltage between the No. 18 terminal of ECM/PCM connector E (31P) and body ground with the ECM/PCM connectors connected.

    Fig. 74: Measuring Voltage Between No. 18 Terminal Of ECM/PCM Connector E (31P) And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Check for loose wires or poor connections at terminal E18 of the ECM/PCM connector E (31P). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM; '04-05 models (see '04-05 MODELS ), '06-08 models (see '06-08 MODELS ).

    NO - Repair open in the wire between the A/C compressor clutch relay and the ECM/PCM.

18. Disconnect the jumper wire.
19. Disconnect the A/C compressor clutch 3P connector.
20. Check for continuity between the No. 2 terminal of A/C compressor clutch relay 4P socket and the No. 2 terminal of the A/C compressor clutch 3P connector.

    Fig. 75: Checking Continuity Between A/C Compressor Clutch Relay 4P Socket And A/C Compressor Clutch 3P Connector
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Check the A/C compressor clutch clearance, and the A/C compressor clutch field coil (see A/C COMPRESSOR CLUTCH CHECK ). Repair as needed.

    NO - Repair open in the wire between the A/C compressor clutch relay and the A/C compressor clutch.

A/C Pressure Switch and Thermal Protecter Circuit Troubleshooting

1. Turn the ignition switch ON (II).
2. Press the AUTO button, then press the A/C button and check the display.

   Does the display indicate A/C on?

   YES - Go to step 3.

   NO - Check for loose or poor connection at the audio-HVAC display panel connector. If the connections are OK, replace the audio-HVAC display panel.

3. Turn the ignition switch OFF.
4. Disconnect thermal protector 3P connector.
5. Turn the ignition switch ON (II).
6. Measure the voltage between the No. 1 terminal of the thermal protector 3P connector and body ground.

   Fig. 76: Measuring Voltage Between No. 1 Terminal Of Thermal Protector 3P Connector And Body Ground
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there about 5 V or more?

   YES - Go to step 7.

   NO - Go to step 21.

7. Turn the ignition switch OFF.
8. Check for continuity between the No. 1 and No. 3 terminals of the thermal protector.

   Fig. 77: Checking Continuity Between No. 1 And No. 3 Terminals Of Thermal Protector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Is there continuity?

   YES - Go to step 9.

   NO - Replace the thermal protector.

9. Reconnect thermal protector 3P connector.
10. Disconnect A/C pressure switch 2P connector.
11. Turn the ignition switch ON (II).
12. Measure the voltage between the No. 1 terminal of A/C pressure switch 2P connector and body ground.

    Fig. 78: Measuring Voltage Between No. 1 Terminal Of A/C Pressure Switch 2P Connector And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V or more?

    YES - Go to step 13.

    NO - Repair open in the wire between the A/C pressure switch and the thermal protector.

13. Turn the ignition switch OFF.
14. Check for continuity between the No. 1 and No. 2 terminals of the A/C pressure switch.

    Fig. 79: Checking Continuity Between No. 1 And No. 2 Terminals Of A/C Pressure Switch
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 15.

    NO - Go to step 22.

15. Reconnect A/C pressure switch 2P connector.
16. Disconnect audio-HVAC display panel connector A (22P).
17. Turn the ignition switch ON (II).
18. Measure the voltage between the No. 5 terminal of audio-HVAC display panel connector A (22P) and body ground.

    Fig. 80: Measuring Voltage Between No. 5 Terminal Of Audio-Hvac Display Panel Connector A (22P) And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 5 V or more?

    YES - Go to step 19.

    NO - Repair open in the wire between the audio-HVAC display panel and the A/C pressure switch.

19. Turn the ignition switch OFF.
20. Measure the resistance between the No. 14 and No. 15 terminals of the audio-HVAC display panel connector A (22P).

    Fig. 81: Measuring Resistance Between No. 14 And No. 15 Terminals Of Audio-Hvac Display Panel Connector A (22P)
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the resistance less than 24 kohms?

    YES - Check for loose wire or poor connections at audio-HVAC display panel connector A (22P) and at A/C pressure switch 2P connector. If the connections are good, substitute a known-good audio-HVAC display panel, and recheck. If the symptom/indication goes away, replace the original audio-HVAC display panel.

    NO - Test the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR TEST ).

21. Using a backprobe set, measure the voltage between the No. 2 terminal of under-hood fuse/ relay box connector H (14P) and body ground with the under-hood fuse/relay box connectors connected.

    Fig. 82: Measuring Voltage Between Under-Hood Fuse/ Relay Box Connector H (14P) And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 5 V or more?

    YES - Repair open in the wire between the under-hood fuse/relay box and the A/C pressure switch.

    NO - Check for loose or poor connections at the No. 2 terminal of the under-hood fuse/relay box. If the connections are OK, replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).

22. Check for proper A/C system pressure.

    Is the pressure within specifications?

    YES - Replace the A/C pressure switch.

    NO - Repair the A/C pressure problem.

In-car Temperature Sensor Test

1. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR REPLACEMENT ).
2. Check for a change in resistance by heating or cooling the sensor with a hair drier.
3. Compare the resistance reading between the No. 1 and No. 2 terminals of the in-car temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.

   Fig. 83: Checking Resistance Reading Between No. 1 And No. 2 Terminals Of In-Car Temperature Sensor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. If the resistance is not as specified, replace the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR TEST ).

In-car Temperature Sensor Replacement

1. Remove the driver's inner dashboard trim (see DRIVER'S INNER DASHBOARD TRIM REMOVAL/INSTALLATION ).
2. Remove the self-tapping screw and the in-car temperature sensor (A) from the driver's inner dashboard trim (B).

   Fig. 84: Identifying In-Car Temperature Sensor And Driver's Inner Dashboard Trim
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Install the sensor in the reverse order of removal. Be sure to connect the air hose securely.

Outside Air Temperature Sensor Test

1. Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT ).
2. Dip the sensor in ice water, and measure the resistance. Then pour warm water on the sensor, and check for a change in resistance.
3. Compare the resistance reading between the No. 1 and No. 2 terminals of the outside air temperature sensor with the specifications shown in the graph; the resistance should be within the specifications.

   Fig. 85: Checking Resistance Reading Between No. 1 And No. 2 Terminals Of Outside Air Temperature Sensor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. If the resistance is not as specified, replace the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR REPLACEMENT ).

Outside Air Temperature Sensor Replacement

1. Lift the tab (A) to release the lock, and remove the outside air temperature sensor (B) from the back of the front bumper beam. Disconnect 2P connector (C) from the outside air temperature sensor.

   Fig. 86: Identifying Air Temperature Sensor, 2P Connector And Tab
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Install the sensor in the reverse order of removal.

Sunlight Sensor Test

1. Remove the sunlight sensor (see SUNLIGHT SENSOR REPLACEMENT ).
2. Turn the ignition switch ON (II). Measure the voltage between the terminals with the (+) probe on the No. 1 terminal and the (-) probe on the No. 2 terminal with the 2P connector connected. The voltage readings will not change under the light of a flashlight or a fluorescent lamp. Voltage should be:
   • 3.6-3.7 V or more with the sensor out of direct sunlight.
   • 3.3-3.5 V or less with the sensor in direct sunlight.

     Fig. 87: Identifying Sunlight Sensor
     Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. If the voltage is not as specified, replace the sunlight sensor (see SUNLIGHT SENSOR REPLACEMENT ).

Sunlight Sensor Replacement

1. Remove the sunlight sensor (A) from the dashboard then disconnect the 2P connector (B). Be careful not to damage the sensor and the dashboard.

   Fig. 88: Identifying Sunlight Sensor And 2P Connector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Install the sensor in the reverse order of removal.

Evaporator Temperature Sensor Test

1. Remove the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR REPLACEMENT ).
2. Dip the sensor in ice water, and measure the resistance between its terminals.

   Fig. 89: Measuring Resistance Between Terminals
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Then pour warm water on the sensor, and check for a change in resistance.
4. Compare the resistance readings with the specifications shown in the graph; the resistance should be within the specifications.

   Fig. 90: Resistance And Temperature Graph
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. If the resistance is not as specified, replace the evaporator temperature sensor (see EVAPORATOR TEMPERATURE SENSOR REPLACEMENT ).

Evaporator Temperature Sensor Replacement

1. Disconnect the 2P connector (A) from the evaporator temperature sensor (B), then remove the connector clip (G). Remove the self-tapping screw, and carefully pull out the evaporator temperature.

   Fig. 91: Identifying 2P Connector, Evaporator Temperature Sensor And Connector Clip
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Install the sensor in the reverse order of removal.

Power Transistor Test

1. Disconnect the 4P connector from the power transistor.
2. Measure the resistance between the No. 3 and No. 4 terminals of the power transistor. It should be about 1.4-1.5 kohms
   • If the resistance is within the specifications, go to step 3.
   • If the resistance is not within the specifications, replace the power transistor.

     NOTE:

     Also check the blower motor. Power transistor failure can be caused by a defective blower motor.

     Fig. 92: Identifying Power Transistor
     Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Carefully release the lock tab on the No. 1 terminal (BLU/YEL^*1 , LT GRN^*2 ) (A) in the 4P connector, then remove the terminal and insulate it from body ground.

   Fig. 93: Identifying Lock Tab On No. 1 Connector Terminal
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Reconnect the 4P connector to the power transistor.
5. Supply 12 V to the No. 1 cavity with a jumper wire.
6. Turn the ignition switch ON (II), and check that the blower motor runs.
   • If the blower motor does not run, replace the power transistor.

     NOTE:

     A faulty blower motor can cause the power transistor to fail. If the power transistor is replaced, also check the blower motor for binding, and replace it if necessary.

   • If the blower motor runs, the power transistor is OK.

Driver's Air Mix Control Motor Test

1. Disconnect the 7P connector from the driver's air mix control motor.

   NOTE:

   Incorrectly applying power and ground to the driver's air mix control motor will damage it. Follow the instructions carefully.

2. Connect battery power to the No. 1 terminal of the driver's air mix control motor, and ground the No. 2 terminal; the driver's air mix control motor should run, Cool side. If it doesn't, reverse the connections; the driver's air mix control motor should run, Hot side.
3. If the driver's air mix control motor did not run in step 2, remove it, then check the driver's air mix control linkage and the door for smooth movement.
   • If the linkage and door move smoothly, replace the driver's air mix control motor.
   • If the linkage or door sticks or binds, repair them as needed.
   • If the driver's air mix control motor runs smoothly, go to step 4.

     Fig. 94: Driver's Air Mix Control Motor
     Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 kohms.
5. Reconnect the driver's air mix control motor 7P connector, then turn the ignition switch ON (II).
6. Measure the voltage between the No. 3 and No. 5 terminals.

   Max Cool: About 0.5 V

   Max Hot: About 4.5 V

7. If either the resistance or voltage readings are not as specified, replace the driver's air mix control motor (see DRIVER'S AIR MIX CONTROL MOTOR REPLACEMENT ).

Driver's Air Mix Control Motor Replacement

1. Disconnect the 7P connector (A) from the driver's air mix control motor (B). Remove the self-tapping screws and the driver's air mix control motor from the heater unit.

   Fig. 95: Identifying 7P Connector And Driver's Air Mix Control Motor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

Passenger's Air Mix Control Motor Test

1. Disconnect the 7P connector from the passenger's air mix control motor.

   NOTE:

   Incorrectly applying power and ground to the passenger's air mix control motor will damage it. Follow the instructions carefully.

2. Connect battery power to the No. 1 terminal of the passenger's air mix control motor, and ground the No. 2 terminal; the passenger's air mix control motor should run, Cool side. If it doesn't, reverse the connections; the passenger's air mix control motor should run Hot side.
3. If the passenger's air mix control motor did not run in step 2, remove it, then check the passenger's air mix control linkage and door for smooth movement.
   • If the linkage and door move smoothly, replace the passenger's air mix control motor.
   • If the linkage or door sticks or binds, repair them as needed.
   • If the passenger's air mix control motor runs smoothly, go to step 4.

     Fig. 96: Passenger's Air Mix Control Motor
     Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 kohms.
5. Reconnect the passenger's air mix control motor 7P connector, then turn the ignition switch ON (II).
6. Measure the voltage between the No. 3 and No. 5 terminals.

   Max Cool: About 1.5 V

   Max Hot: About 4.5 V

7. If either the resistance or the voltage readings are not as specified, replace the passenger's air mix control motor (see PASSENGER'S AIR MIX CONTROL MOTOR REPLACEMENT ).

Passenger's Air Mix Control Motor Replacement

1. Disconnect the 7P connector (A) from the passenger's air mix control motor (B). Remove the self-tapping screws and the passenger's air mix control motor from the heater unit.

   Fig. 97: Identifying 7P Connector And Passenger's Air Mix Control Motor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

Mode Control Motor Test

1. Disconnect the 7P connector from the mode control motor.

   NOTE:

   Incorrectly applying power and ground to the mode control motor will damage it. Follow the instructions carefully.

2. Connect battery power to the No. 2 terminal of the mode control motor, and ground the No. 1 terminal; the mode control motor should run smoothly. Vent side. If it doesn't, reverse the connections; the mode control motor should run smoothly, Defrost side. When the mode control motor stops running, disconnect battery power immediately.

   Fig. 98: Mode Control Motors
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. If the mode control motor did not run in step 2, remove it, then check the mode control linkage and doors for smooth movement.
   • If the linkage and doors move smoothly, replace the mode control motor.
   • If the linkage or doors stick or bind, repair them as needed.
   • If the mode control runs smoothly, go to step 4.
4. Use a digital multimeter with an output of 1 mA or less at the 20 kohms range. With the mode control motor running as in step 2, check for continuity between the No. 3,4,5, and 6 terminals and the No. 7 terminal individually. There should be continuity for a moment at each terminal as the motor moves past the switch's terminal.
5. If there is no continuity for a moment at each terminal, replace the mode control motor (see MODE CONTROL MOTOR REPLACEMENT ).

Mode Control Motor Replacement

1. Open the glove box. Remove the damper from the glove box, then let the glove box hang down (see GLOVE BOX REMOVAL/INSTALLATION ).
2. Remove the relays from the bracket.

   Fig. 99: Identifying Relays Of Bracket
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Disconnect the 7P connector (A) from the mode control motor (B). Remove the self-tapping screws and the mode control motor from the heater unit.

   Fig. 100: Identifying 7P Connector And Mode Control Motor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Install the motor in the reverse order of removal. After installation, make sure the motor runs smoothly.

Recirculation Control Motor Test

1. Disconnect the 7P connector from the recirculation control motor.

   NOTE:

   Incorrectly applying power and ground to the recirculation control motor will damage it. Follow the instructions carefully.

2. Connect battery power to the No. 1 terminal of the recirculation control motor, and ground the No. 5 and No. 7 terminals; the recirculation control motor should run smoothly. To avoid damaging the recirculation control motor, do not reverse power and ground. Disconnect the No. 5 or No. 7 terminal from ground; the recirculation control motor should stop at Fresh (when the No. 7 terminal is disconnected) or Recirculate (when the No. 5 terminal is disconnected). Don't cycle the recirculation control motor for a long time.

   Fig. 101: Recirculation Control Motor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. If the recirculation control motor did not run in step 2, remove it, then check the recirculation control linkage and doors for smooth movement.
   • If the linkage and doors move smoothly, replace the recirculation control motor (see RECIRCULATION CONTROL MOTOR REPLACEMENT ).
   • If the linkage or doors stick or bind, repair them as needed.

Recirculation Control Motor Replacement

1. Open the glove box. Remove the damper from the glove box, then let the glove box hang down (see GLOVE BOX REMOVAL/INSTALLATION ).
2. Remove the relays from the bracket.

   Fig. 102: Recirculation Control Motor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Disconnect the 7P connector (A) from the recirculation control motor (B). Remove the self-tapping screws and the recirculation control motor from the blower unit.

   Fig. 103: Identifying 7P Connector And Recirculation Control Motor
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly engaged with the linkage. After installation, make sure the motor runs smoothly.

Dust and Pollen Filter Replacement

1. Open the glove box. Remove the damper from the glove box, then let the glove box hang down (see GLOVE BOX REMOVAL/INSTALLATION ).
2. Remove the dust and pollen filter assembly from the evaporator.

   Fig. 104: Identifying Pollen Filter Assembly And Evaporator
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Remove the filter (A) from the housing (B), and replace the filter.

   Fig. 105: Identifying Filter And Housing
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Install the filter in the reverse order of removal. Make sure that there is no air leaking out of the evaporator.

Blower Unit Removal/Installation

1. Remove the following items:
   • Passenger's dashboard lower cover (see PASSENGER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION )
   • Glove box (see GLOVE BOX REMOVAL/INSTALLATION )
   • Passenger's kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS )
2. Remove the wire harness connector clips (A), the wire harness clip (B), and bolt. Cut the plastic cross brace (C) in the glove box opening with diagonal cutters in the area shown.

   Fig. 106: Identifying Wire Harness Connector Clips, Wire Harness Clip And Bolt
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Disconnect the connectors (A) from the blower motor, the floor wire harness, and the recirculation control motor, then remove the wire farness clips (B) and the connector clip (C). Remove the mounting nuts, the mounting bolts and the blower unit (D).

   Fig. 107: Identifying Blower Unit Mounting Nuts And Bolts W/Torque Specifications
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Install the unit in the reverse order of removal. Make sure that there is no air leakage.

Blower Unit Component Replacement

Note these items when overhauling the blower unit:

• The recirculation control motor (A), the blower motor (B), and the dust and pollen filter (C) can be replaced without removing the blower unit.
• Before reassembly, make sure that the recirculation control linkage and doors move smoothly without binding.
• After reassembly, make sure the recirculation control motor runs smoothly (see RECIRCULATION CONTROL MOTOR TEST ).

  Fig. 108: Identifying Recirculation Control Motor, Pollen Filter And Blower Motor
  Courtesy of AMERICAN HONDA MOTOR CO., INC.

Evaporator Core Replacement

1. Recover the refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY ).
2. Remove the bolt, then disconnect the suction line (A) and the receiver line (B) from the evaporator core.

   Fig. 109: Identifying Suction Line And Receiver Line W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Remove the blower unit (see BLOWER UNIT REMOVAL/INSTALLATION ).
4. Disconnect the connector (A) from the power transistor, then remove the wire harness clips (B) the self-tapping screws, and the expansion valve cover (C).

   Fig. 110: Identifying Wire Harness Clips, Expansion Valve Cover And Connectors
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Carefully pull out the evaporator core (A) and the plate (B) without bending the pipes.

   Fig. 111: Identifying Evaporator Core And Plate
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

6. Install the core in the reverse order of removal, and note these items:
   • If you're installing a new evaporator core, add refrigerant oil (SP-10) (see A/C REFRIGERANT OIL REPLACEMENT ).
   • Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage.
   • Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption.
   • Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
   • Make sure that there is no air leakage.
   • Charge the system (see SYSTEM CHARGING ).

Expansion Valve Replacement

1. Recover the refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY ).
2. Remove the evaporator core (see BLOWER UNIT COMPONENT REPLACEMENT ).
3. Remove the expansion valve cover (A), and bolts (B) from the expansion valve (C).

   Fig. 112: Identifying Expansion Valve Cover Bolts W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Install the core in the reverse order of removal, and note these items:
   • If you're installing a new expansion valve, add refrigerant oil (SP-10) (see A/C REFRIGERANT OIL REPLACEMENT ).
   • Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage.
   • Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption.
   • Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
   • Make sure that there is no air leakage.
   • Charge the system (see SYSTEM CHARGING ).

Heater Unit/Core Replacement

SRS components are located in this area. Review the SRS component locations (see COMPONENT LOCATION INDEX ) and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) in the SRS article before doing repairs or service.

1. Make sure you have the anti-theft codes for the audio system and the navigation system (if equipped), then write down the audio presets.
2. Disconnect the negative cable from the battery.
3. Disconnect the suction and receiver lines from the evaporator core (see BLOWER UNIT COMPONENT REPLACEMENT ).
4. From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the heater valve arm (C). Turn the heater valve arm to the fully opened position as shown.

   Fig. 113: Identifying Cable Clamp, Heater Valve Cable And Heater Valve Arm
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. When the engine is cool, drain the engine coolant from the radiator; '04-05 models (see '04-05 MODELS ), '06-08 models (see '06-08 MODELS ).
6. Slide the hose clamps (A) back. Remove the bolt and water valve bracket, then disconnect the inlet heater hose (B) and the outlet heater hose (C) from the heater unit. Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure not to let coolant spill on the electrical parts or the painted surfaces. If any coolant spills, rinse it off immediately.

   Fig. 114: Identifying Hose Clamps, Inlet Heater Hose And Outlet Heater Hose
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines and the brake lines, etc.

   Fig. 115: Identifying Heater Unit Mounting Nut W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Remove the dashboard (see DASHBOARD/STEERING HANGER BEAM REMOVAL/INSTALLATION ).
9. Remove the footrest and the footrest bracket.
10. Disconnect the connectors (A) from the driver's air mix control motor, the evaporator temperature sensor, the power transistor, the mode control motor, passenger's air mix control motor, and the recirculation control motor, then remove the wire harness clips (B), the connector clips (C) and the wire harness (D). Remove the heater ducts (E), then remove the mounting nuts and the blower-heater unit (F).

    Fig. 116: Identifying Blower Heater Motor Connectors, Connector Clips W/Torque Specification
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Remove the self-tapping screws and the joint duct A, then remove the self-tapping screws and the joint duct B. Remove the self-tapping screws, then remove the passenger's heater outlet (C), and the heater core cover (D). Remove the self-tapping screws, the heater pipe bracket (E), the grommets (F) and carefully pull out the heater core (G) so you don't bend the inlet and outlet pipes.

    Fig. 117: Identifying Self-Tapping Screw, Heater Core Cover And Passenger's Heater Outlet
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

12. Install the heater core and the evaporator core in the reverse order of removal.
13. Install the heater unit in the reverse order of removal, and note these items:
    • Do not interchange the inlet and outlet heater hoses, and install the hose clamps securely.
    • Refill the cooling system with engine coolant; '04-05 models (see step 7 on '04-05 MODELS ), '06-08 models (see step 7 on '06-08 MODELS ).
    • Adjust the heater valve cable (see HEATER VALVE CABLE ADJUSTMENT ).
    • Make sure that there is no coolant leakage.
    • Make sure that there is no air leakage.
    • Refer to BLOWER UNIT COMPONENT REPLACEMENT .
    • Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
    • Enter the anti-theft codes for the audio system and the navigation system (if equipped), then enter the audio presets.

Heater Valve Cable Adjustment

1. From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the heater valve arm (C).

   Fig. 118: Identifying Cable Clamp, Heater Valve Cable And Heater Valve Arm
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. From under the dash, disconnect the heater valve cable housing from the cable clamp (A), and disconnect the heater valve cable (B) from the air mix control linkage (C).

   Fig. 119: Identifying Cable Clamp, Heater Valve Cable And Air Mix Control Linkage
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Set the temperature control dial to Max Cool with the ignition switch ON (II).
4. Attach the heater valve cable to the air mix control linkage as shown in step 2. Hold the end of the heater valve cable housing against the stop (D), then snap the heater valve cable housing into the cable clamp.
5. From under the hood, turn the heater valve arm (A) to the fully closed position as shown, and hold it. Attach the heater valve cable (B) to the heater valve arm, and gently pull on the heater valve cable housing to take up any slack, then install the heater valve cable housing into the cable clamp (C).

   Fig. 120: Turning Heater Valve Arm
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

A/C Compressor Replacement

1. If the A/C compressor is marginally operable, run the engine at idle speed, and let the air conditioning work for a few minutes, then shut the engine off.
2. Make sure you have the anti-theft codes for the audio system and the navigation system (if equipped), then write down the audio presets.
3. Make sure the ignition switch is OFF then disconnect the negative cable from the battery.
4. Recover the refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY ).
5. Remove the drive belt (see DRIVE BELT AUTO-TENSIONER REPLACEMENT ).
6. Remove the A/C compressor clutch connector (A) from the A/C condenser fan shroud (B). Disconnect the A/C condenser fan connector (C), then remove the wire harness clip (D) from the A/C condenser fan shroud. Remove the hose (E) from the reserve tank (F). Remove the bolts (G) and the radiator fan shroud. Be careful not to damage the radiator fins when removing the A/C condenser fan shroud.

   Fig. 121: Identifying A/C Compressor Clutch Connector, Mounting Bolts W/Torque Specifications
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Disconnect the A/C compressor clutch connector (A). Remove the nuts, then disconnect the suction line (B) and discharge line (C) from the A/C compressor. Plug or cap the lines immediately after disconnecting them to avoid moisture and dust contamination.

   Fig. 122: Identifying A/C Compressor Clutch Connector Terminals W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Remove the splash shield (see SPLASH SHIELD REPLACEMENT ).
9. Remove the mounting bolts and the A/C compressor. Be careful not to damage the radiator fins when removing the A/C compressor.

   Fig. 123: Identifying A/C Compressor Clutch Connector, Mounting Bolts W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

10. Install the A/C compressor in the reverse order of removal, and note these items:
    • If you're installing a new A/C compressor, you must calculate the amount of refrigerant oil to be removed from it (see A/C REFRIGERANT OIL REPLACEMENT ).
    • Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage.
    • Use refrigerant oil (SP-10) for HFC-134a KEIHIN spiral type A/C compressor only.
    • To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other refrigerant oils.
    • Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption.
    • Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
    • Be careful not to damage the radiator fins when installing the A/C compressor and the A/C condenser fan shroud.
    • Charge the system (see SYSTEM CHARGING ).
    • Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
    • Enter the anti-theft codes for the audio system and the navigation system (if equipped), then enter the audio presets.

A/C Compressor Clutch Check

1. Check the armature plate for discoloration, peeling, or other damage. If there is damage, replace the clutch set (see A/C COMPRESSOR CLUTCH OVERHAUL ).
2. Check the rotor pulley bearing play and drag by rotating the rotor pulley (A) by hand. Replace the clutch set with a new one if it is noisy or has excessive play/drag (see A/C COMPRESSOR CLUTCH OVERHAUL ).

   Fig. 124: Rotating Rotor Pulley
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Measure the clearance between the rotor pulley (A) and the armature plate (B) all the way around. If the clearance is not within specified limits, remove the armature plate (see A/C COMPRESSOR CLUTCH OVERHAUL ) and add or remove shims as needed to increase or decrease clearance.

   Clearance: 0.5 ± 0.15 mm (0.020 ± 0.006 in.)

   NOTE:

   The shims are available in four thicknesses: 0.1 mm, 0.2 mm, 0.4 mm, and 0.5 mm.

   Fig. 125: Measuring Clearance Between Rotor Pulley And Armature Plate
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Release the field coil connector from the holder, then disconnect it. Check the thermal protector for continuity. If there is no continuity, replace the thermal protector (see A/C COMPRESSOR THERMAL PROTECTOR REPLACEMENT ).

   NOTE:

   The thermal protector will have no continuity above 252 to 270°F (122 to 132°C). When the temperature drops below 241 to 219°F (116 to 104°C), the thermal protector will have continuity.

   Fig. 126: Checking Thermal Protector For Continuity
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Check resistance of the field coil. If resistance is not within specifications, replace the field coil (see A/C COMPRESSOR CLUTCH OVERHAUL ).

   Field Coil Resistance: 3.05-3.35 ohms at 68°F (20°C)

   Fig. 127: Checking Resistance Of Field Coil
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

A/C Compressor Clutch Overhaul

Special Tools Required

A/C clutch holder, Robin air 10204 or Kent-Moore J37872, Honda Tool and Equipment KMT-J33939, or commercially available.

1. Remove the center nut (A) while holding the armature plate with the special tool (B).

   Fig. 128: Removing Center Nut W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Remove the armature plate (A) and shim(s) (B), taking care not to lose the shim(s). If the clutch needs adjustment, increase or decrease the number and thickness of shims as necessary, then reinstall the armature plate, and recheck its clearance (see A/C COMPRESSOR CLUTCH CHECK ).

   NOTE:

   The shims are available in four thicknesses: 0.1 mm, 0.2 mm, 0.4 mm and 0.5 mm.

   Fig. 129: Identifying Armature Plate And Shim
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. If you are replacing the field coil, remove the snap ring (A) with snap ring pliers, then remove the rotor pulley (B). Be careful not to damage the rotor pulley and A/C compressor.

   Fig. 130: Identifying Snap Ring And Rotor Pulley
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Remove the bolt and holder (A), then disconnect the field coil connector (B). Loosen the clamp screw (C) to free the field coil wire. Remove the snap ring (D) with snap ring pliers, then remove the field coil (E). Be careful not to damage the field coil and A/C compressor.

   Fig. 131: Identifying Field Coil W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Reassemble the clutch in the reverse order of disassembly, and note these items:
   • Install the field coil with the wire side facing down, and align the boss on the field coil with the hole in the A/C compressor.
   • Clean the rotor pulley and A/C compressor sliding surfaces with contact cleaner or other non-petroleum solvent.
   • Install new snap rings, note the installation direction, and make sure they are fully seated in the groove.
   • Make sure that the rotor pulley turns smoothly after its reassembled.
   • Route and clamp the wires properly or they can be damaged by the rotor pulley.

A/C Compressor Thermal Protector Replacement

1. Remove the bolt, the ground terminal (A), and the holder (B). Disconnect the field coil connector (C), then remove the thermal protector (D).

   Fig. 132: Identifying Thermal Protector W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Replace the thermal protector (A) with a new one, and apply silicone sealant (B) to the bottom of the thermal protector.

   Fig. 133: Applying Silicone Sealant To Thermal Protector
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Install the thermal protector in the reverse order of removal.

A/C Compressor Relief Valve Replacement

1. Recover the refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY ).
2. Remove the relief valve (A), and the O-ring (B). Plug the opening to keep foreign matter from entering the system and the A/C compressor oil from running out.

   Fig. 134: Identifying Relief Valve And O-Ring W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Clean the mating surfaces.
4. Replace the O-ring with a new one at the relief valve, and apply a thin coat of refrigerant oil before installing it.
5. Remove the plug, then install and tighten the relief valve.
6. Charge the system (see SYSTEM CHARGING ).

A/C Condenser Replacement

1. Make sure you have the anti-theft codes for the audio system and the navigation system (if equipped), then write down the audio presets.
2. Recover the refrigerant with a recovery/recycling/charging station (see REFRIGERANT RECOVERY ).
3. Remove the front bulkhead cover.
4. Make sure the ignition switch is OFF, then remove the battery and the battery box.
5. Remove the clips (A), then remove the intake air cover (B) and the intake air tube or duct (C).

   Fig. 135: Identifying A/C Condenser, Intake Air Cover And Clips
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

6. Remove the hose (A) from the reserve tank (B). Remove the bolts (C) and the reserve tank from the A/C condenser fan shroud.

   Fig. 136: Identifying Reserve Tank, Hose And Bolts
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

7. Remove the bolts (A) and the radiator upper mount brackets (B).

   Fig. 137: Identifying Radiator Upper Mount Brackets Bolts W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Remove the bolt (A), then disconnect the receiver line (B) from the A/C condenser (C).

   Fig. 138: IDentifying Receiver Line Bolt W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

9. Remove the bolts (A) and the A/C condenser upper mount brackets (B).

   Fig. 139: Identifying A/C Condenser Upper Mount Brackets W/Torque Specification
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

10. Remove the bolt (A), then disconnect the discharge line (B) from the A/C condenser (C).

    Fig. 140: Identifying A/C Condenser Discharge Line Bolt W/Torque Specification
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

11. Remove the A/C condenser by lifting it up. Be careful not to damage the radiator and A/C condenser fins when removing the A/C condenser.

    Fig. 141: Identifying A/C Condenser
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

12. Install the A/C condenser in the reverse order of removal, and note these items:
    • If you're installing a new A/C condenser, add refrigerant oil (SP-10) (see A/C REFRIGERANT OIL REPLACEMENT ).
    • Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage.
    • Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption.
    • Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
    • Be careful not to damage the radiator or the A/C condenser fins when installing the A/C condenser.
    • Charge the system (see SYSTEM CHARGING ).
    • Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
    • Enter the anti-theft codes for the audio system and the navigation system (if equipped), then enter the audio presets.

Receiver/Dryer Desiccant Replacement

1. Remove the A/C condenser (see A/C CONDENSER REPLACEMENT ).
2. Remove the lower cushion (A), then remove the cap (B) from the bottom of the A/C condenser. Remove the O-rings (C), the filter (D) and the desiccant (E).

   Fig. 142: Identifying Lower Cushion, Cap And A/C Condenser
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Install the desiccant in the reverse order of removal, and note these items:

   Replace the O-rings with new ones, and apply a thin coat of refrigerant oil (SP-10) before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage.

Refrigerant Recovery

CAUTION:

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. Be careful when connecting service equipment. Do not breathe refrigerant or vapor.

Use only service equipment that is U.L-listed and is certified to meet the requirements of SAE J2210 to remove HFC-134a (R-134a) from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.

   Fig. 143: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Measure the amount of refrigerant oil removed from the A/C system after the recovery process is completed. Be sure to put the same amount of new refrigerant oil back into the A/C system before charging.

System Evacuation

CAUTION:

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. Be careful when connecting service equipment. Do not breathe refrigerant or vapor.

Use only service equipment that is U.L.-listed and is certified to meet the requirements of SAE J2210 to remove HFC-134a (R-134a) from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. When an A/C System has been opened to the atmosphere, such as during installation or repair, it must be evacuated using an R-134a refrigerant recovery/recycling/charging station. If the system has been open for several days, the receiver/dryer should be replaced, and the system should be evacuated for several hours.
2. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions. Evacuate the system.

   Fig. 144: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. If the low-pressure does not reach more than 93.3 kPa (700 mmHg, 27.6 in.Hg) in 15 minutes, there is probably a leak in the system. Partially charge the system, and check for leaks (see step 3 on REFRIGERANT LEAK TEST ).

System Charging

CAUTION:

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. Be careful when connecting service equipment. Do not breathe refrigerant or vapor.

Use only service equipment that is U.L-listed and is certified to meet the requirements of SAE J2210 to remove HFC-134a (R-134a) from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.

   Fig. 145: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Evacuate the system (see SYSTEM EVACUATION ).
3. Add the same amount of new refrigerant oil to the system that was removed during recovery. Use only SP-10 refrigerant oil.
4. Charge the system with the specified amount of R-134a refrigerant. Do not overcharge the system; the A/C compressor will be damaged.

   Select the appropriate units of measure for your refrigerant charging station.

   Refrigerant Capacity:

   500 to 550 g

   0.50 to 0.55 kg

   1.1 to 1.2 lbs

   17.6 to 19.4 oz

5. Check for refrigerant leaks (see REFRIGERANT LEAK TEST ).
6. Check for system performance (see PERFORMANCE TEST ).

Refrigerant Leak Test

Special Tool Required

Leak detector, Honda Tool and Equipment YGK-H-10PM commercially available

WARNING:

Compressed air mixed with the R-134a forms a combustible vapor. The vapor can burn or explode causing serious injury. Never use compressed air to pressure test R-134a service equipment or vehicle air conditioning systems.

CAUTION:

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. Be careful when connecting service equipment. Do not breathe refrigerant or vapor.

Use only service equipment that is U.L.-listed and is certified to meet the requirements of SAE J2210 to remove HFC-134a (R-134a) from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

R-134a service equipment or vehicle air conditioning systems should not be pressure tested or leak tested with compressed air.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. Connect an R-134a refrigerant recovery/recycling/charging station (A) to the high-pressure service port (B) and the low-pressure service port (C), as shown, following the equipment manufacturer's instructions.

   Fig. 146: Connecting R-134a Refrigerant Charging Station To High-Pressure Service Port And Low-Pressure Service Port
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Open the high pressure valve to charge the system to the specified capacity, then close the supply valve, and disconnect the charging station fittings.

   Select the appropriate units of measurement for your refrigerant charging station.

   Refrigerant Capacity:

   500 to 550 g

   0.50 to 0.55 kg

   1.1 to 1.2 lbs

   17.6 to 19.4 oz

3. Check the system for leaks using an R-134a refrigerant leak detector with an accuracy of 14 g (0.5 oz) per year or better.
4. If you find leaks that require the system to be opened (to repair or replace hoses, fittings, etc.), do a recovery of the system.
5. After checking and repairing leaks, the system must be evacuated.

A/C System Test

Performance Test

WARNING:

Compressed air mixed with the R-134a forms a combustible vapor. The vapor can burn or explode causing serious injury. Never use compressed air to pressure test R-134a service equipment or vehicle air conditioning systems.

CAUTION:

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat. Be careful when connecting service equipment. Do not breathe refrigerant or vapor.

The performance test will help determine if the air conditioner system is operating within specifications.

Use only service equipment that is U.L-listed and is certified to meet the requirements of SAE J2210 to remove HFC-134a (R-134a) from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

R-134a service equipment or vehicle air conditioning systems should not be pressure tested or leak tested with compressed air.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. Connect an R-134a refrigerant recovery/recycling/charging station to the high-pressure service port and the low-pressure service port, following the equipment manufacturer's instructions.
2. Determine the relative humidity and air temperature.
3. Open the glove box. Remove the damper from the glove box, then let the glove box hang down (see GLOVE BOX REMOVAL/INSTALLATION ).
4. Insert a thermometer (A) in the center vent.

   Fig. 147: Identifying Thermometer In Center Unit
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Place a thermometer (B) near the blower unit.
6. Test conditions:
   • Avoid direct sunlight.
   • Open hood.
   • Open front doors.
   • Set the temperature control dial to Max Cool, the mode control switch to Vent and the recirculation control switch to Recirculate.
   • Turn the A/C switch on and the fan switch to Max.
   • Hold the engine speed at 1,500 rpm.
   • No driver or passengers in vehicle.
7. After running the air conditioning for 10 minutes under the above test conditions, read the delivery temperature from the thermometer in the center vent, the intake temperature near the blower unit, and the high and low system pressure from the A/C gauges.
8. Refer to the inspection data.
   • Mark the delivery temperature along the vertical line.
   • Mark the intake temperature (ambient air temperature) along the bottom line.
   • Draw a line straight up from the air temperature to the humidity.
   • From each point, draw a horizontal line across the delivery temperature.
   • The delivery temperature should fall between the two lines.
   • Complete the low-side pressure test and high-side pressure test in the same way.

     Fig. 148: Ambient (Intake) Temperature Vs. Vent (Delivery) Temperature
     Courtesy of AMERICAN HONDA MOTOR CO., INC.

     Fig. 149: Ambient (Intake) Temperature Vs. High Side (Discharge) Pressure
     Courtesy of AMERICAN HONDA MOTOR CO., INC.

     Fig. 150: Ambient (Intake) Temperature Vs. Low Side (Suction) Pressure
     Courtesy of AMERICAN HONDA MOTOR CO., INC.

Pressure Test

PRESSURE TEST

Test results	Related symptoms	Probable cause	Remedy
Discharge (high) pressure abnormally high	After stopping A/C compressor, pressure drops about 196 kPa (2.0 kgf/cm2 , 28 psi) quickly, and then falls gradually.	Air in system	Recover, evacuate (see SYSTEM EVACUATION ), and recharge with specified amount (see SYSTEM CHARGING ).
	No bubbles in sight glass when A/C condenser is cooled by water.	Excessive refrigerant in system	Recover, evacuate, and recharge with specified amount.
	Reduced or no airflow through A/C condenser.	Clogged A/C condenser or radiator fins A/C condenser or radiator fan not working properly	Clean. Check voltage and fan rpm. Check fan direction.
	Line to A/C condenser is excessively hot.	Restricted flow of refrigerant in system	Restricted lines.
Discharge pressure abnormally low	Excessive bubbles in sight glass; A/C condenser is not hot.	Insufficient refrigerant in system	Check for leak. Charge system.
	High and low-pressures are balanced soon after stopping A/C compressor. Low side is higher than normal.	Faulty A/C compressor discharge valve Faulty A/C compressor seal	Replace the A/C compressor.
	Outlet of expansion valve is not frosted, low-pressure gauge indicates vacuum.	Faulty expansion valve Moisture in system	Replace. Recover, evacuate, and recharge with specified amount.
Suction (low) pressure abnormally low	Excessive bubbles in sight glass; A/C condenser is not hot.	Insufficient refrigerant in system	Repair the leaks. Recover, evacuate, and recharge with specified amount. Charge as required.
	Expansion valve is not frosted, and low-pressure line is not cold. Low-pressure gauge indicates vacuum.	Frozen expansion valve (Moisture in system) Faulty expansion valve	Recover, evacuate, and recharge with specified amount. Replace the expansion valve.
	Discharge temperature is low, and the airflow from vents is restricted.	Frozen evaporator	Run the fan with A/C compressor off, then check evaporator temperature sensor.
	Expansion valve is frosted.	Clogged expansion valve	Clean or replace.
Suction pressure abnormally high	Low-pressure hose and service port are cooler than the temperature around evaporator.	Expansion valve open too long	Repair or replace.
	Suction pressure is lowered when A/C condenser is cooled by water.	Excessive refrigerant in system	Recover, evacuate, and recharge with specified amount.
	High and low-pressures are equalized as soon as the A/C compressor is stopped, and both gauges fluctuate while running.	Faulty gasket Faulty high-pressure valve Foreign particle stuck in high-pressure valve	Replace the A/C compressor.
Suction and discharge pressures abnormally high	Reduced airflow through A/C condenser.	Clogged A/C condenser or radiator fins A/C condenser or radiator fan not working properly	Clean. Check voltage and fan rpm. Check fan direction.
	No bubbles in sight glass when A/C condenser is cooled by water.	Excessive refrigerant in system	Recover, evacuate, and recharge with specified amount.
Suction and discharge pressures abnormally low	Low-pressure hose and metal fittings areas are cooler than evaporator.	Clogged or kinked low-pressure hose parts	Repair or replace.
	Temperature around expansion valve is too low compared with that around receiver/dryer.	Clogged high-pressure line	Repair or replace.
Refrigerant leaks	A/C compressor clutch is dirty.	A/C compressor shaft seal leaking	Replace the A/C compressor.
	A/C compressor bolt(s) are dirty.	Leaking around bolt(s)	Tighten bolt(s) or replace A/C compressor.
	A/C compressor gasket is wet with oil.	Gasket leaking	Replace the A/C compressor.
	A/C fitting is dirty.	Leaking O-ring	Clean the A/C fitting and replace the O-ring.

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