IMMOBILIZER SYSTEM

• HEADINGS
  • Component Location Index
  • System Description
    • '04-06 models
    • '07-08 models
  • Circuit Diagram
  • Symptom Troubleshooting Information
    • General Check before Troubleshooting
    • Symptom Troubleshooting Using the Immobilizer Indicator Lighting Pattern
      • Normal operation (Lighting pattern 1)
      • +B line open (Lighting pattern 2)
      • Immobilizer code is not identified (Lighting pattern 3)
      • Immobilizer indicator does not come on (Lighting pattern 4)
      • Immobilizer indicator does not go off (Lighting pattern 5)
    • Symptom Troubleshooting Using Malfunctioning Circuit Functions
    • System Check and Status Log
  • Troubleshooting
    • '04-06 models
    • '07-08 models
  • Imoes Unit Input Test/Replacement
    • '07-08 models
  • System Check
  • Status Log
  • Immobilizer Key Registration
    • Add one new key
    • Delete or add multiple Keys
    • All keys are lost
  • Immobilizer Control Unit-Receiver Replacement
• FIGURES
  • Fig. 1: Identifying Immobilizer System Component Location
  • Fig. 2: Immobilizer Control Unit-Receiver Communication Diagram ('04-06 Models)
  • Fig. 3: Immobilizer Control Unit-Receiver Communication Diagram ('07-08 Models)
  • Fig. 4: Immobilizer Indicator Light Blinking Pattern
  • Fig. 5: Immobilizer System Circuit Diagram ('04-06 Models)
  • Fig. 6: Immobilizer System Circuit Diagram ('07-08 Models)
  • Fig. 7: Malfunctioning Symptom Troubleshooting Chart
  • Fig. 8: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 5 (IMOARM) Terminal And Body Ground
  • Fig. 9: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 7 (+B) Terminal And Body Ground
  • Fig. 10: Checking Continuity Between Immobilizer Control Unit-Receiver And Gauge Control Module Connector Terminal
  • Fig. 11: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 6 (IG1) Terminal And Body Ground
  • Fig. 12: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM/PCM Connector Terminal
  • Fig. 13: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 2 Terminal And Body Ground
  • Fig. 14: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM/PCM Connector Terminal
  • Fig. 15: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 5 Terminal And Body Ground
  • Fig. 16: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 7 (+B) Terminal And Body Ground
  • Fig. 17: Checking Immobilizer Control Unit-Receiver No. 5 (IMOLMP) Terminal To Ground
  • Fig. 18: Checking Continuity Between Immobilizer Control Unit-Receiver And Gauge Control Module Connector Terminal
  • Fig. 19: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 6 (IG1) Terminal And Body Ground
  • Fig. 20: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 1 (LG3) And No. 6 (IG1) Terminals
  • Fig. 21: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM Connector Terminal
  • Fig. 22: Checking Continuity Between Imoes Unit 5P And ECM/PCM Connector Terminal
  • Fig. 23: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 2 IMOCD Terminal And Body Ground
  • Fig. 24: Checking Continuity Between Imoes Unit 5P Connector No. 2 IMOCD (S-Net) Terminal And Body Ground
  • Fig. 25: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM/PCM Connector Terminal
  • Fig. 26: Checking Continuity Between IMOES Unit 5P And ECM/PCM Connector Terminal
  • Fig. 27: Identifying Imoes Unit 5P Connector Terminal
  • Fig. 28: Identifying Immobilizer Control Unit-Receiver 7P Connector Terminal
• TABLES
  • TEST CONDITION REFERENCE CHART
  • IMMOBILIZER SYSTEM REFERENCE CHART
  • IMMOBILIZER SYSTEM REFERENCE CHART

2004-08 ACCESSORIES & EQUIPMENT

Immobilizer System - TSX

Component Location Index

Fig. 1: Identifying Immobilizer System Component Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

System Description

The vehicle is equipped with an immobilizer system that will disable the vehicle unless the proper ignition key is used. This system consists of a transponder located in the ignition key, an immobilizer control unit-receiver, an indicator, the imoes unit ('07-08 models) and the ECM/PCM.

'04-06 models

When the immobilizer key (programmed by the HDS) is inserted in the ignition switch and turned to the ON (II) position, the immobilizer control unit-receiver sends power to the transponder in the ignition key. The transponder then sends a coded signal back to the immobilizer control unit-receiver which then sends a coded signal to the ECM/PCM to supply power to the fuel pump circuit.

Fig. 2: Immobilizer Control Unit-Receiver Communication Diagram ('04-06 Models)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

'07-08 models

When the immobilizer key (programmed by the HDS) is inserted into the ignition switch and turned to the ON (II) position, the immobilizer control unit-receiver sends power to the transponder in the ignition key. The transponder then sends a coded signal back to the immobilizer control unit-receiver which sends a coded signal to the imoes unit, which confirms the code and signals the ECM/PCM to supply power to the fuel pump circuit. A communication agreement with the HDS is required at the ECM/PCM or the imoes unit after repair or replacement. When replacing the immobilizer control unit-receiver, all keys are required to be registered into the new control unit-receiver. Any keys that were not registered in the control unit-receiver will not start the vehicle.

Fig. 3: Immobilizer Control Unit-Receiver Communication Diagram ('07-08 Models)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

• If the proper key has been used, the immobilizer indicator will come on for about 2 seconds, then go off.
• If the wrong key has been used or the code was not received or recognized by the unit, the indicator will come on for about 2 seconds, then it will blink until the ignition switch is turned OFF.
• If the ignition switch is turned OFF, the indicator will blink for about 5 seconds to signal that the unit has reset correctly, then the indicator will go off.

  IMMOBILIZER INDICATOR LIGHT BLINKING PATTERN:

  Fig. 4: Immobilizer Indicator Light Blinking Pattern
  Courtesy of AMERICAN HONDA MOTOR CO., INC.

Circuit Diagram

'04-06 models

Fig. 5: Immobilizer System Circuit Diagram ('04-06 Models)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

'07-08 models

Fig. 6: Immobilizer System Circuit Diagram ('07-08 Models)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Symptom Troubleshooting Information

General Check before Troubleshooting

Before troubleshooting the immobilizer system, check the following general items and solve any if applicable:

• The battery is low; charge the battery fully, then troubleshoot the immobilizer system.
• The ignition key is not a genuine Honda part; use the Honda - approved key blank, register the key, then troubleshoot the immobilizer system.
• A key ring, or keys, or a key case is used; remove the key from it, and troubleshoot the immobilizer system with a key only.
• An aftermarket electrical part is attached; remove it, then troubleshoot the immobilizer system.

Symptom Troubleshooting Using the Immobilizer Indicator Lighting Pattern

The pattern of the immobilizer indicator light can help troubleshooting the condition of the immobilizer system. Following are descriptions of the five possible patterns:

Normal operation (Lighting pattern 1)

When the ignition switch is turned ON (II) and the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off.

The immobilizer indicator blinks five times when the ignition switch is turned OFF.

+B line open (Lighting pattern 2)

When the ignition switch is turned ON (II) and the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off.

The immobilizer indicator goes off when the ignition switch is turned OFF.

Immobilizer code is not identified (Lighting pattern 3)

When the ignition switch is turned ON (II) but the immobilizer code is not identified, the immobilizer indicator comes on for 2 seconds, then blinks. The state of the immobilizer key registration and the IMOCD line can be checked by doing a SYSTEM CHECK and STATUS LOG CHECK with the HDS (see SYSTEM CHECK ).

The immobilizer indicator goes off when the ignition switch is turned OFF.

Immobilizer indicator does not come on (Lighting pattern 4)

If the immobilizer indicator does not come on when the ignition switch is turned ON (II), check the following items:

• Check that there is battery voltage on the +B line.
• Check that the IG1 line is grounded through the ECM/PCM.
• Check for continuity between the immobilizer control unit-receiver and the gauge control module IMOARM or (IMOLMP line).
• Gauge control module

Immobilizer indicator does not go off (Lighting pattern 5)

If the immobilizer indicator does not go off after the ignition switch is turned ON (II), check for a short to ground in the immobilizer circuit between the gauge module and the immobilizer control unit-receiver (IMOLMP line).

Symptom Troubleshooting Using Malfunctioning Circuit Functions

If a malfunction occurs in the immobilizer circuit, use the following table to cross-reference the malfunctioning function to the line(s) that should be checked:

Fig. 7: Malfunctioning Symptom Troubleshooting Chart
Courtesy of AMERICAN HONDA MOTOR CO., INC.

System Check and Status Log

NOTE:

The HDS can be used to: Check the state of the immobilizer key registration and the IMOCD (S-NET) line by doing a SYSTEM CHECK. Check the number of times the immobilizer control unit-receiver doesn't permit the engine to run by checking the STATUS LOG.

1. Connect the HDS to the data link connector, then turn the ignition switch ON (II) and follow the prompts to the MAIN MENU.

   NOTE:

   If the HDS does not communicate with the vehicle, go to the DLC CIRCUIT TROUBLESHOOTING .

   • '04-06 models (see '04-06 MODELS )
   • '07-08 models (see '07-08 MODELS )
2. At the MAIN MENU, enter IMMOBILIZER, then select the IMMOBILIZER SET UP.
3. Do the SYSTEM CHECK. If there is a system check number, do the troubleshooting for the item indicated (see SYSTEM CHECK ).
4. Check the status log using the HDS. Troubleshoot the line with the highest counts (see STATUS LOG ). If all the lines are "0" zero, the problem may not be caused by the immobilizer system, check for ignition or fuel problems.

   NOTE:

   Once repaired, clear the status log by removing the No. 7 (15 A) fuse in the under-dash fuse/relay box or disconnecting the battery.

Troubleshooting

'04-06 models

1. Turn the ignition switch ON (II) with a programmed key.
2. Check to see if the immobilizer indicator comes on.

   Does the indicator come on?

   YES - Go to step 3.

   NO - Go to step 12.

3. Check the immobilizer indicator operation.

   Does the indicator come on for 2 seconds, then go off?

   YES - Go to step 4.

   NO - Go to step 6.

4. Try to start the engine.

   Does the starter motor operate?

   YES - Go to step 5.

   NO - Check the starter motor.

5. Try to start the engine.

   Does the engine start?

   YES - If available, check the Status Log in the Immobilizer Info with the HDS (see STATUS LOG ). If the Status Log is all zeroes, the immobilizer system is OK at this time.

   NO - Go to step 25.

6. Check to see if the immobilizer indicator comes on and blinks.

   Does the indicator blink?

   YES - Go to step 25.

   NO - Go to step 7.

7. Disconnect the 7P connector from the immobilizer control unit-receiver.
8. Check to see if the immobilizer indicator goes off.

   Does the indicator go off?

   YES - Substitute a known-good immobilizer control unit-receiver and/or ECM/PCM.

   NO - Go to step 9.

9. Turn the ignition switch OFF.
10. Remove the gauge control module and disconnect its connectors (see GAUGE CONTROL MODULE REPLACEMENT ).
11. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 (IMOARM) terminal and body ground.

    Fig. 8: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 5 (IMOARM) Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair a short in the wire.

    NO - Faulty immobilizer indicator, replace the gauge control module.

12. Try to start the engine.

    Does the engine start?

    YES - Go to step 13.

    NO - Go to step 18.

13. Turn the ignition switch OFF.
14. Disconnect the 7P connector from the immobilizer control unit-receiver.
15. Measure the voltage between the immobilizer control unit-receiver 7P connector No. 7 (+B) terminal and body ground.

    Fig. 9: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 7 (+B) Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 16.

    NO - Faulty No. 7 (15 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the immobilizer control unit-receiver and under-dash fuse/relay box.

16. Remove the gauge control module and disconnect connector A (22P) (see GAUGE CONTROL MODULE REPLACEMENT ).
17. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 (IMOARM) terminal and gauge control module connector A (22P) No. 22 terminal.

    Fig. 10: Checking Continuity Between Immobilizer Control Unit-Receiver And Gauge Control Module Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Faulty immobilizer indicator, replace the gauge control module.

    NO - Repair an open in the wire.

18. Turn the ignition switch OFF.
19. Disconnect the 7P connector from the immobilizer control unit-receiver.
20. Turn the ignition switch ON (II).
21. Measure the voltage between the immobilizer control unit-receiver 7P connector No. 6 (IG1) terminal and body ground.

    Fig. 11: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 6 (IG1) Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 22.

    NO - Faulty No. 19 (15 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the immobilizer control unit-receiver and under-dash fuse/relay box.

22. Turn the ignition switch OFF.
23. Jump the SCS line with the HDS.
24. Disconnect connector E (31P) from the ECM/PCM.
25. Check for continuity between the immobilizer control unit-receiver 7P connector No. 1 (LG3) terminal and ECM/PCM connector E (31P) No. 3 terminal.

    Fig. 12: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM/PCM Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Check the immobilizer control unit-receiver.

    NO - Repair an open in the wire.

26. Turn the ignition switch OFF.
27. Connect the HDS to the data link connector.
28. Turn the ignition switch ON (II).
29. Look at the System Check in the Immobilizer Info with the HDS (see SYSTEM CHECK ).

    Is the immobilizer system normal?

    YES - Go back to step 1.

    NO - Go to step 29.

30. Verify the System Check display on the HDS.
    • Harness short from the ECM/PCM to the immobilizer unit. (IMOCD (S-net) line short)
    • The communication was not good between the ECM/PCM and the immobilizer unit by the battery voltage low.
    • The communication was not good between the immobilizer control unit-receiver and the ECM/PCM by influence of some noise.
    • Immobilizer control unit-receiver failure
    • ECM/PCM failure

    Does the HDS display the information?

    YES - Go to step 30.

    No - Go to step 34.

31. Turn the ignition switch OFF.
32. Disconnect the 7P connector from the immobilizer control unit-receiver.
33. Jump the SCS line with the HDS.
34. Disconnect ECM/PCM connector E (31P).
35. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 (IMOCD (S-NET)) terminal and body ground.

    Fig. 13: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 2 Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair a short in the wire.

    No - Substitute a known-good immobilizer control unit-receiver and/or ECM/PCM.

36. Verify the System Check display on the HDS.
    • Blown fuse
    • Harness open from the ECM/PCM and the immobilizer unit.
    • The communication was not good between the ECM/PCM and the immobilizer unit by battery voltage low.
    • The communication was not good between the immobilizer unit and the ECM/PCM by influence of some noise.
    • Immobilizer unit failure
    • ECM/PCM failure

    Does the HDS display the information?

    YES - Go to step 35.

    No - Check the Possible Failures shown on the System Check display (see SYSTEM CHECK ).

37. Turn the ignition switch OFF.
38. Disconnect the 7P connector from the immobilizer control unit-receiver.
39. Jump the SCS line with the HDS.
40. Disconnect ECM/PCM connector E (31P).
41. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 IMOCD (S-NET) terminal and ECM/PCM connector E (31P) No. 27 terminal.

    Fig. 14: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM/PCM Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Check the immobilizer control unit-receiver and ECM/PCM.

    NO - Repair an open in the wire.

'07-08 models

1. Turn the ignition switch ON (II) with a programmed key.
2. Check to see if the immobilizer indicator comes on.

   Does the indicator come on?

   YES - Go to step 3.

   NO - Go to step 12.

3. Check the immobilizer indicator operation.

   Does the indicator come on for 2 seconds, then go off?

   YES - Go to step 4.

   NO - Go to step 6.

4. Try to crank the engine.

   Does the starter motor operate?

   YES - Go to step 5.

   NO - Check the starter motor.

5. Try to start the engine.

   Does the engine start?

   YES - Check the Status Log in the Immobilizer Info with the HDS (see STATUS LOG ). Troubleshoot the line with the highest count first. If all lines are zero, the immobilizer system is not the problem.

   NO - Go to step 32.

6. Check to see if the immobilizer indicator comes on and blinks.

   Does the indicator blink?

   YES - Go to step 29.

   NO - Go to step 7.

7. Disconnect the 7P connector from the immobilizer control unit-receiver.
8. Check to see if the immobilizer indicator goes off.

   Does the indicator go off?

   YES - Substitute a known-good immobilizer control unit-receiver and/or ECM/PCM.

   NO - Go to step 9.

9. Turn the ignition switch OFF.
10. Remove the gauge control module and disconnect its connectors (see GAUGE CONTROL MODULE REPLACEMENT ).
11. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 (IMOLMP) terminal and body ground.

    Fig. 15: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 5 Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair a short to ground in the wire.

    NO - Faulty immobilizer indicator, replace the gauge control module.

12. Try to start the engine.

    Does the engine start?

    YES - Go to step 13.

    NO - Go to step 19.

13. Turn the ignition switch OFF.
14. Disconnect the 7P connector from the immobilizer control unit-receiver.
15. Measure the voltage between the immobilizer control unit-receiver 7P connector No. 7 (+B) terminal and body ground.

    Fig. 16: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 7 (+B) Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 16.

    NO - Faulty No. 7 (15 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the immobilizer control unit-receiver and under-dash fuse/relay box.

16. Using a jumper wire, connect the immobilizer control unit-receiver No. 5 (IMOLMP) terminal to ground.

    Fig. 17: Checking Immobilizer Control Unit-Receiver No. 5 (IMOLMP) Terminal To Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the indicator come on?

    YES - Replace the immobilizer control unit-receiver.

    NO - Go to step 17.

17. Remove the gauge control module and disconnect its 22P connector (see GAUGE CONTROL MODULE REPLACEMENT ).
18. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 (IMOLMP) terminal and gauge control module connector A (22P) No. 22 terminal.

    Fig. 18: Checking Continuity Between Immobilizer Control Unit-Receiver And Gauge Control Module Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Faulty immobilizer indicator, replace the immobilizer indicator bulb or gauge control module.

    NO - Repair an open in the wire.

19. Turn the ignition switch OFF.
20. Disconnect the 7P connector from the immobilizer control unit-receiver.
21. Turn the ignition switch ON (II).
22. Measure the voltage between the immobilizer control unit-receiver 7P connector No. 6 (IG1) terminal and body ground.

    Fig. 19: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 6 (IG1) Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 23.

    NO - Faulty No. 19 (15 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the immobilizer control unit-receiver and under-dash fuse/relay box.

23. Measure the voltage between the immobilizer control unit-receiver 7P connector No. 1 (LG3) and No. 6 (IG1) terminals.

    Fig. 20: Measuring Voltage Between Immobilizer Control Unit-Receiver 7P Connector No. 1 (LG3) And No. 6 (IG1) Terminals
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Substitute a known-good immobilizer control unit-receiver control, and recheck.

    NO - Go to step 24.

24. Turn the ignition switch OFF.
25. Jump the SCS line with the HDS.
26. Disconnect the ECM/PCM connector E (31P).
27. Check for continuity between the immobilizer control unit-receiver 7P connector No. 1 (LG3) terminal and ECM connector E (31P) No. 3 (LG3) terminal.

    Fig. 21: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 28.

    NO - Repair an open in the wire.

28. Check for continuity between the imoes unit 5P connector No. 1 (LG3) terminal and ECM/PCM connector E (31P) No. 3 (LG3) terminal.

    Fig. 22: Checking Continuity Between Imoes Unit 5P And ECM/PCM Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Substitute a known-good immobilizer control unit-receiver and/or imoes unit, and recheck.

    NO - Repair an open in the wire.

29. Turn the ignition switch OFF.
30. Connect the HDS to the data link connector.
31. Turn the ignition switch ON (II).
32. Look at the System Check in the Immobilizer Info with the HDS (see SYSTEM CHECK ).

    Is the immobilizer system normal?

    YES - Go to Fuel and Emissions Systems symptom troubleshooting (see SYMPTOM TROUBLESHOOTING INDEX ).

    NO - Go to step 33.

33. Verify the System Check display on the HDS.
    • Harness short from the ECM/PCM to the immobilizer control unit-receiver. (IMOCD (S-NET) line short)
    • The communication was not good between the ECM/PCM and the immobilizer control unit-receiver by the battery voltage low.
    • The communication was not good between the immobilizer control unit-receiver and the ECM/PCM by influence of some noise.
    • Immobilizer control unit-receiver failure
    • ECM/PCM failure

    Does the HDS display any of the preceding information?

    YES - Go to step 34.

    NO - Go to step 40.

34. Turn the ignition switch OFF.
35. Disconnect the 7P connector from the immobilizer control unit-receiver.
36. Jump the SCS line with the HDS.
37. Disconnect ECM/PCM connector E (31P).
38. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 IMOCD (S-NET) terminal and body ground.

    Fig. 23: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector No. 2 IMOCD Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair a short to ground in the wire.

    NO - Go to step 39.

39. Check for continuity between the imoes unit 5P connector No. 2 IMOCD (S-NET) terminal and body ground.

    Fig. 24: Checking Continuity Between Imoes Unit 5P Connector No. 2 IMOCD (S-Net) Terminal And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair a short to ground in the wire.

    NO - Substitute a known-good imoes unit, ECM/PCM and/or immobilizer control unit-receiver, and recheck.

40. Verify the Status Log display on the HDS.
    • Blown fuse
    • Harness open from the ECM/PCM and the immobilizer control unit-receiver.
    • The communication was not good between the ECM/PCM and the immobilizer control unit-receiver by battery voltage low.
    • The communication was not good between the immobilizer control unit-receiver and the ECM/PCM by influence of some noise.
    • Immobilizer control unit-receiver failure
    • ECM/PCM failure

    Does the HDS display any of the preceding information?

    YES - Check the Possible Failures shown on the Status Log display (see STATUS LOG ).

    NO - Go to step 41.

41. Turn the ignition switch OFF.
42. Disconnect the 7P connector from the immobilizer control unit-receiver.
43. Jump the SCS line with the HDS.
44. Disconnect ECM/PCM connector E (31P).
45. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 IMOCD (S-NET) terminal and ECM/PCM connector E (31P) No. 27 (IMOCD) terminal.

    Fig. 25: Checking Continuity Between Immobilizer Control Unit-Receiver And ECM/PCM Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 46.

    NO - Repair an open in the wire.

46. Check for continuity between the IMOES unit 5P connector No. 2 IMOCD (S-NET) terminal and ECM/PCM connector E (31P) No. 27 (IMOCD) terminal.

    Fig. 26: Checking Continuity Between IMOES Unit 5P And ECM/PCM Connector Terminal
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Substitute a known-good imoes unit and/or immobilizer control unit-receiver, and recheck the system. If the imoes unit and/or immobilizer control unit-receiver is OK, substitute a known-good ECM/PCM, and recheck.

    NO - Repair an open in the wire.

Imoes Unit Input Test/Replacement

'07-08 models

1. Disconnect the 5P connector (A) from the imoes unit (B).

   Fig. 27: Identifying Imoes Unit 5P Connector Terminal
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

2. Inspect the connector and socket terminals to be sure they are all making good contact.
   • If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.
   • If the terminals look OK, go to step 3.
3. With the connectors still disconnected, make these input tests at the connector.
   • If any test indicates a problem, find and correct the cause, then recheck the system.
   • If all the input tests prove OK, replace the imoes unit, then do the imoes unit registration with the HDS, and make sure the immobilizer indicator blinks correctly.

     TEST CONDITION REFERENCE CHART
     

     Cavity	Wire (Signal)	Test condition	Test: Desired result	Possible cause if desired result is not obtained
     1	BRN/YEL (LG3)	Jump the SCS line with the HDS. Disconnect ECM/PCM connector E (31P).	Check for continuity between the No. 1 terminal and ECM/PCM connector E (31P) No. 3 terminal: There should be continuity.	An open in the wire
     5	RED (+B)	Under ail conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 15 (40 A) fuse in the under-hood fuse/relay box Blown No. 7 (15 A) fuse in the under-dash fuse/relay box An open in the wire
     3	BLK/YEL (IG1)	Ignition switch ON (ID	Measure the voltage to ground: There should be battery voltage.	Blown No. 19 (15 A) fuse in the under-dash fuse/relay box An open in the wire
     4	RED (KEY SW)	Ignition key is in the ignition switch	Measure the voltage to ground: There should be less than 1 V.	Faulty ignition key switch An open in the wire Poor ground (G501, G601)
     		Ignition key is removed from the ignition switch	Measure the voltage to ground: There should be battery voltage.	Faulty ignition key switch A short to ground in the wire
     2	RED (IMOCD) (S-NET)	Jump the SCS line with the HDS. Disconnect ECM/PCM connector E (31P).	Check for continuity between the No. 2 terminal and ECM/PCM connector E (31P) No. 27 terminal: There should be continuity.	An open in the wire
     			Check for continuity between the No. 2 terminal and body ground: There should be continuity.	A short to ground in the wire

System Check

1. Connect the HDS to the data link connector.
2. Turn the ignition switch ON (II).
3. Monitor the System Check in the Immobilizer Info with the HDS.
4. If the HDS displays the "Immobilizer system is normal", the immobilizer system is OK. If the HDS displays any other messages, check as follows:

   IMMOBILIZER SYSTEM REFERENCE CHART
   

   Status Log No.	System Check	Possible Failures
   A-1	Immobilizer system is not normal	This key is not registered in the immobilizer control unit-receiver. Try to register keys by using "KEYS". The communication Was not good between the antenna and the immobilizer key by influence of metal such as key chains. The communication was not good between the antenna and the immobilizer key by battery voltage low.
   A-2	Immobilizer system is not normal	Intermittent interruption between transponder and immobilizer control unit-receiver. The immobilizer key type is different. It is not for this vehicle but for another one or for other company's one. Key failure (transponder failure) The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains. The communication was not good between the antenna and the immobilizer key by battery voltage low.
   A-3	Immobilizer system is not normal	The ignition switch was turned on with a non-immobilizer key. The immobilizer key type is different. It is not for this vehicle but for another one or for other company's one. Key failure (transponder failure) The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains. The communication was not good between the antenna and the immobilizer key by battery voltage low. Immobilizer control unit-receiver failure
   B-1	Immobilizer system is not normal	The ECM/PCM was not registered. Try to register the ECM/PCM by using "REPLACE ECM/PCM". The communication was not good between the ECM/PCM and the immobilizer control unit-receiver by battery voltage low. The communication was not good between the immobilizer control unit-receiver and the ECM/PCM by influence of some noise.
   B-2	Immobilizer system is not normal	The ECM/PCM was not registered. Try to register the ECM/PCM by using "REPLACE ECM/PCM". The communication was not good between the ECM/PCM and the immobilizer control unit-receiver by battery voltage low. The communication was not good between the immobilizer control unit-receiver and the ECM/PCM by influence of some noise.
   C-1	Immobilizer system is not normal	The imoes unit was not registered. Try to register the imoes unit by using "REPLACE MICU/ imoes".
   C-2	Immobilizer system is not normal	The imoes unit was not registered. Try to register the imoes unit by using "REPLACE MICU/imoes". The communication was not good between the immobilizer control unit-receiver and the imoes unit by influence of some noise.
   D-1	Immobilizer system is not normal	Harness short from the ECM/PCM to the immobilizer control unit-receiver. (IMOCD (S-NET) line short) The communication was not good between the ECM/PCM and the immobilizer control unit-receiver by battery voltage low. The communication was not good between the immobilizer control unit-receiver and the ECM/PCM by influence of some noise. Immobilizer control unit-receiver failure ECM/PCM failure
   D-2	Immobilizer system is not normal	Blown fuse Harness open from the immobilizer control unit-receiver and the imoes unit. The communication was not good between the immobilizer control unit-receiver and the imoes by influence of some noise.
   D-3	Immobilizer system is not normal	Blown fuse Harness open from the ECM/PCM to the immobilizer control unit-receiver. The communication was not good between the ECM/PCM and the immobilizer control unit-receiver by battery voltage low. The communication was not good between the immobilizer control unit-receiver and the ECM/PCM by influence of some noise. Immobilizer control unit-receiver failure ECM/PCM failure

Status Log

If you suspect there is an immobilizer system problem, cheek the status log.

NOTE:

Status log may not be available for all models. If you have an updated immobilizer control unit-receiver ('04 models) or a '05-08 models, status log should be available.

1. Connect the HDS to the data link connector.
2. Turn the ignition switch ON (II).
3. On the HDS screen, select Honda systems, select immobilizer set-up, select immobilizer information, then select status log.
4. Check the Status log count. Troubleshoot the status with the highest count first. If no counts are listed, the immobilizer system is OK. Continue with normal symptom troubleshooting.

   IMMOBILIZER SYSTEM REFERENCE CHART
   

   Status Log No.	Detected Item	Probable Cause
   A-1	KEY CODE MISMATCH (Code format normal, but code data is mismatch)	The key was not registered Interference from metal such as key chains Low battery voltage
   A-2	KEY CODE MISMATCH (Code format failure)	Ignition switch was turned on with another type of immobilizer key or aftermarket key Interference from metal such as key chains Low battery voltage
   A-3	KEY CODE MISMATCH (No key code or non-immobilizer key)	Ignition switch was turned on with another type of immobilizer key or aftermarket key Interference from metal such as key chains Low battery voltage Key failure Immobilizer control unit-receiver failure
   B-1	ECM/PCM CODE MISMATCH (Code format normal, but code data is mismatch)	ECM/PCM was not registered correctly Low battery voltage Poor or loose terminal connections at the immobilizer control unit-receiver Communication line electrical noise
   B-2	ECM/PCM MISMATCH (Code format failure)	ECM/PCM was not registered correctly Low battery voltage Poor or loose terminal connections at the immobilizer control unit-receiver Communication line electrical noise
   D-1	IMOCD (S-NET) LINE PROBLEM (Short to ground)	Low battery voltage Poor or loose terminal connections at the immobilizer control unit-receiver and the ECM/PCM Communication line electrical noise
   D-3	IMOCD (S-NET) LINE PROBLEM (Open line or ECM/PCM failure)	Open or short in the harness from the ECM/PCM to the immobilizer control unit-receiver Low battery voltage Poor or loose terminal connections at the immobilizer control unit-receiver and the ECM/PCM Communication line electrical noise

Immobilizer Key Registration

NOTE:

The HDS is required for registration of the immobilizer keys. Check for aftermarket electrical equipment that can cause problems with transponder operation. The immobilizer control unit-receiver can store up to six immobilizer Keys.

Add one new key

1. Have a registered key, a new immobilizer key, and the first pass word from the iN system.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch ON (II).
4. Select "IMMOBILIZER" from the "SYSTEM SELECT" menu.
5. Select "Add and Delete Keys", then "Add 1 key".
6. Do the registration according to the instructions on the HDS screen.
7. Check if the engine can be started by the newly registered key.

Delete or add multiple Keys

NOTE:

If any of the registered keys were lost, do the following procedure to delete the lost registered key.

1. Have all registered keys, all new keys, and the first password.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch ON (II).
4. Select "IMMOBILIZER" from the "SYSTEM SELECT" menu.
5. Select "Add and Delete Keys", or "Delete or Add Multiple Keys".
6. Do the registration according to the instruction of HDS screen.
7. Check if the engine can be started by all the registered keys.

All keys are lost

1. Prepare all new keys and have the immobilizer PCM code.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch ON (II).
4. Select "IMMOBILIZER" from the "SYSTEM SELECT" menu.
5. Select "Add and Delete Keys", then "ALL KEYS LOST".
6. Do the registration according to the instruction of HDS screen.
7. Check if the engine can be started by all the registered keys.

Immobilizer Control Unit-Receiver Replacement

1. Remove the dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
2. Remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
3. Disconnect the 7P connector (A) from the immobilizer control unit-receiver (B).

   Fig. 28: Identifying Immobilizer Control Unit-Receiver 7P Connector Terminal
   Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Remove the two screws and the immobilizer control unit-receiver from the ignition key cylinder (C).
5. Install the immobilizer control unit-receiver in the reverse order of removal.
6. After replacement, check the immobilizer system.

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