Yandex MC
2004-08 ENGINE Fan Controls - TSX <meta name="InColGX" content=""> </head> <body bgcolor="white" text="black"> <h1>2004-08 ENGINE</h1> <h1>Fan Controls - TSX</h1><a name="S34886983142008080900000"></a><h2 class="clsHeadOne">Component Location Index</h2> <p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490340" name="S38431977612008080900000">Fig. 1: Identifying Fan Controls Component Location</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p><a name="S32988035352008080900000"></a><h2 class="clsHeadOne">Symptom Troubleshooting Index</h2> <p><span class="clsEmphBOLD">'04-05 models</span> </p> <p><span class="clsArticleTable"><a name="S23442212842008080900000"></a><span class="clsTableTitle">SYMPTOM TROUBLESHOOTING CHART - 04-05 MODELS</span><br><table cellspacing="0" class="clsArticleTable58"> <colgroup> <col span="1" id="COL1" align="LEFT"> <col span="1" id="COL2" align="LEFT"> <col span="1" id="COL3" align="LEFT"> </colgroup> <thead> <tr class="clsTblHead"> <th align="CENTER" class="clsCellNormal">Symptom</th> <th align="CENTER" class="clsCellNormal">Diagnostic procedure</th> <th align="CENTER" class="clsCellNormal">Also check for</th> </tr> </thead> <tbody> <tr> <td align="LEFT" class="clsCellNormal">Engine overheats</td> <td align="LEFT" class="clsCellNormal"> <ol class="clsARABICNUM"> <li>Check the coolant level.</li> <li>Check for coolant leakage (from gaskets, hoses, O-rings, etc.).</li> <li>Check for dirt, leaves, or insects on radiator and condenser.</li> <li>Check for deteriorated coolant.</li> <li>Check for damaged or deformed fan shrouds.</li> <li>Inspect the fan motors (see <a class="clsExtHyperlink" id="A00293816_S04061564452008080900000">FAN MOTOR TEST</a> ) or fan relays (see <a class="clsExtHyperlink" id="A00293832_S41533820332008080900000">POWER RELAY TEST</a> ).</li> <li>Check the radiator cap (see <a class="clsExtHyperlink" id="A00293816_S31160123212008080900000">RADIATOR CAP TEST</a> ).</li> <li>Check the thermostat (see <a class="clsExtHyperlink" id="A00293816_S10420813792008080900000">THERMOSTAT TEST</a> ).</li> <li>Inspect the water pump (see <a class="clsExtHyperlink" id="A00293816_S02118602042008080900000">WATER PUMP INSPECTION</a> ).</li> <li>Check for plugged or deteriorated radiator hoses.</li> <li>Check for plugged heater core or hose(s).</li> <li>Check for a damaged cylinder head gasket.</li> </ol> </td> <td align="LEFT" class="clsCellNormal"> </td> </tr> <tr> <td align="LEFT" class="clsCellNormal">The radiator fan does not run at all</td> <td align="LEFT" class="clsCellNormal">Radiator fan circuit troubleshooting (see <a class="clsHyperlink" href="#S14042747632008080900000">RADIATOR FAN CIRCUIT TROUBLESHOOTING</a> ).</td> <td align="LEFT" class="clsCellNormal">Cleanliness and tightness of all connectors</td> </tr> <tr> <td align="LEFT" class="clsCellNormal">The radiator fan does not run for engine cooling, but it runs with the A/C on</td> <td align="LEFT" class="clsCellNormal">Radiator fan switch circuit troubleshooting (Open) (see <a class="clsHyperlink" href="#S22787702612008080900000">RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (OPEN)</a> ).</td> <td align="LEFT" class="clsCellNormal">Cleanliness and tightness of all connectors</td> </tr> <tr> <td align="LEFT" class="clsCellNormal">The radiator fan runs with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 199°F (93°C)</td> <td align="LEFT" class="clsCellNormal">Radiator fan switch circuit troubleshooting (Short) (see <a class="clsHyperlink" href="#S17319554162008080900000">RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (SHORT)</a> ).</td> <td align="LEFT" class="clsCellNormal">Cleanliness and tightness of all connectors</td> </tr> <tr> <td align="LEFT" class="clsCellNormal">The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on)</td> <td align="LEFT" class="clsCellNormal">A/C condenser fan circuit troubleshooting (see <a class="clsExtHyperlink" id="A00293823_S28159211412008080900000">A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING</a> ).</td> <td align="LEFT" class="clsCellNormal"> <ul class="clsBULLET"> <li>HVAC DTCs (see <a class="clsExtHyperlink" id="A00293823_S15710764712008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> ).</li> <li>Cleanliness and tightness of all connectors</li> </ul> </td> </tr> <tr> <td align="LEFT" class="clsCellNormal">Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on)</td> <td align="LEFT" class="clsCellNormal">Radiator and A/C condenser fan common circuit troubleshooting (see <a class="clsExtHyperlink" id="A00293823_S02017488482008080900000">RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING</a> ).</td> <td align="LEFT" class="clsCellNormal"> <ul class="clsBULLET"> <li>HVAC DTCs (see <a class="clsExtHyperlink" id="A00293823_S15710764712008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> ).</li> <li>Cleanliness and tightness of all connectors</li> </ul> </td> </tr> </tbody> </table></span></p> <p><span class="clsEmphBOLD">'06-08 models</span> </p> <p><span class="clsArticleTable"><a name="S41004910822008080900000"></a><span class="clsTableTitle">SYMPTOM TROUBLESHOOTING CHART - 06-08 MODELS</span><br><table cellspacing="0" class="clsArticleTable58"> <colgroup> <col span="1" id="COL1" align="LEFT"> <col span="1" id="COL2" align="LEFT"> <col span="1" id="COL3" align="LEFT"> </colgroup> <thead> <tr class="clsTblHead"> <th align="CENTER" class="clsCellNormal">Symptom</th> <th align="CENTER" class="clsCellNormal">Diagnostic procedure</th> <th align="CENTER" class="clsCellNormal">Also check for</th> </tr> </thead> <tbody> <tr> <td align="LEFT" class="clsCellNormal">Engine overheats</td> <td align="LEFT" class="clsCellNormal"> <ol class="clsARABICNUM"> <li>Check the coolant level.</li> <li>Check for coolant leakage (from gaskets, hoses, O-rings, etc.).</li> <li>Check for dirt, leaves, or insects oh radiator and A/C condenser.</li> <li>Check for deteriorated coolant.</li> <li>Check for damaged or deformed fan shrouds.</li> <li>Inspect the fan motors (see <a class="clsExtHyperlink" id="A00293816_S04061564452008080900000">FAN MOTOR TEST</a> ) or fan relays (see <a class="clsExtHyperlink" id="A00293832_S41533820332008080900000">POWER RELAY TEST</a> ).</li> <li>Check the radiator cap (see <a class="clsExtHyperlink" id="A00293816_S31160123212008080900000">RADIATOR CAP TEST</a> ).</li> <li>Check the thermostat (see <a class="clsExtHyperlink" id="A00293816_S10420813792008080900000">THERMOSTAT TEST</a> ).</li> <li>Inspect the water pump (see <a class="clsExtHyperlink" id="A00293816_S02118602042008080900000">WATER PUMP INSPECTION</a> ).</li> <li>Check for plugged or deteriorated radiator hoses.</li> <li>Check for plugged heater core or hoses.</li> <li>Check for a damaged cylinder head gasket.</li> </ol> </td> <td align="LEFT" class="clsCellNormal"> </td> </tr> <tr> <td align="LEFT" class="clsCellNormal">The radiator fan does not run at all</td> <td align="LEFT" class="clsCellNormal"> <ol class="clsARABICNUM"> <li>Check for PGM-FI DTCs (see <a class="clsExtHyperlink" id="A00293834_S37308099622008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> ).</li> <li>Radiator fan circuit troubleshooting (see <a class="clsHyperlink" href="#S14042747632008080900000">RADIATOR FAN CIRCUIT TROUBLESHOOTING</a> ).</li> </ol> </td> <td align="LEFT" class="clsCellNormal">Cleanliness and tightness of all connectors</td> </tr> <tr> <td align="LEFT" class="clsCellNormal">Both the radiator fan and the A/C condenser fan run with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 199°F (93°C)</td> <td align="LEFT" class="clsCellNormal">Remove the radiator fan relay, and test.<br><ul class="clsBULLET"> <li>If the relay is faulty, replace it.</li> <li>If the relay is OK, repair a short in the wire between radiator fan relay 4P socket terminal No. 4 and ECM/PCM connector terminal E12.</li> </ul> </td> <td align="LEFT" class="clsCellNormal">Cleanliness and tightness of all connectors</td> </tr> <tr> <td align="LEFT" class="clsCellNormal">The A/C condenser fan does not run at all (but the radiator fan runs with the A/C on)</td> <td align="LEFT" class="clsCellNormal">A/C condenser fan circuit troubleshooting (see <a class="clsExtHyperlink" id="A00293823_S28159211412008080900000">A/C CONDENSER FAN CIRCUIT TROUBLESHOOTING</a> ).</td> <td align="LEFT" class="clsCellNormal"> <ul class="clsBULLET"> <li>HVAC DTCs (see <a class="clsExtHyperlink" id="A00293823_S15710764712008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> )</li> <li>Cleanliness and tightness of all connectors</li> </ul> </td> </tr> <tr> <td align="LEFT" class="clsCellNormal">Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on)</td> <td align="LEFT" class="clsCellNormal">Radiator and A/C condenser fan common circuit troubleshooting (see <a class="clsExtHyperlink" id="A00293823_S02017488482008080900000">RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING</a> ).</td> <td align="LEFT" class="clsCellNormal"> <ul class="clsBULLET"> <li>HVAC DTCs (see <a class="clsExtHyperlink" id="A00293823_S15710764712008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> )</li> <li>Cleanliness and tightness of all connectors</li> </ul> </td> </tr> <tr> <td align="LEFT" class="clsCellNormal">The A/C compressor clutch does not engage (but both the radiator fan and the A/C condenser fan run with the A/C on)</td> <td align="LEFT" class="clsCellNormal">A/C compressor clutch circuit troubleshooting (see <a class="clsExtHyperlink" id="A00293823_S05499421592008080900000">A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING</a> ).</td> <td align="LEFT" class="clsCellNormal"> <ul class="clsBULLET"> <li>HVAC DTCs (see <a class="clsExtHyperlink" id="A00293823_S15710764712008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> )</li> <li>Cleanliness and tightness of all connectors</li> </ul> </td> </tr> </tbody> </table></span></p><a name="S27999422532008080900000"></a><h2 class="clsHeadOne">Circuit Diagram</h2> <p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490341" name="S20193209282008080900000">Fig. 2: Fan Controls Circuit Diagram</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p><a name="S14042747632008080900000"></a><h2 class="clsHeadOne">Radiator Fan Circuit Troubleshooting</h2><a name="S21195775632008080900000"></a><h2 class="clsHeadTwo">'04-05 models</h2> <p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td>Before beginning this troubleshooting procedure, refer to the <a class="clsHyperlink" href="#S32988035352008080900000">SYMPTOM TROUBLESHOOTING INDEX</a>.</td> </tr> </table></span></p> <ol class="clsARABICNUM"> <li>Check the No. 11 (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.<p><span class="clsEmphITAL">Are the fuses OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 2.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the f use(s) and recheck.</p> </li> <li>Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see <a class="clsExtHyperlink" id="A00293832_S41533820332008080900000">POWER RELAY TEST</a> ).<p><span class="clsEmphITAL">Is the relay OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 3.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the radiator fan relay.</p> </li> <li>Measure the voltage between radiator fan relay 4P socket terminal No. 2 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490342" name="S10204325722008080900000">Fig. 3: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 2 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there battery voltage?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 4.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the under-hood fuse/relay box.</p> </li> <li>Connect radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490343" name="S39998552592008080900000">Fig. 4: Connecting Radiator Fan Relay 4P Socket Terminal No. 1 And No. 2 With Jumper Wire</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Does the radiator fan run?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 5.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step <a class="clsListItemLink" href="#S14771699242008080900000">6</a>.</p> </li> <li>Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490344" name="S34448673192008080900000">Fig. 5: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 3 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there battery voltage?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step <a class="clsListItemLink" href="#S31526428732008080900000">9</a>.</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.</p> </li><a name="S14771699242008080900000"></a><li>Disconnect the radiator fan motor 2P connector.</li> <li>Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490345" name="S12973744342008080900000">Fig. 6: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 1 And Radiator Fan Motor 2P Terminal No. 2</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there continuity?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 8.</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.</p> </li> <li>Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490346" name="S36712889302008080900000">Fig. 7: Checking Continuity Between Radiator Fan Motor 2P Connector Terminal No. 1 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there continuity?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Replace the radiator fan motor (see <a class="clsExtHyperlink" id="A00293816_S26446280022008080900000">RADIATOR AND FAN REPLACEMENT</a> ).</p> <p><span class="clsEmphBOLD">NO</span> -Repair open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.</p> </li><a name="S31526428732008080900000"></a><li>Reinstall the radiator fan relay.</li> <li>Disconnect the radiator fan switch 2P connector.</li> <li>Connect radiator fan switch 2P connector terminal No. 1 and No. 2 with a jumper wire.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490347" name="S09276149052008080900000">Fig. 8: Connecting Radiator Fan Switch 2P Connector Terminal No. 1 And No. 2 With Jumper Wire</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Does the radiator fan run?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Replace the radiator fan switch (see <a class="clsHyperlink" href="#S25476967062008080900000">RADIATOR FAN SWITCH REPLACEMENT</a> ).</p> <p><span class="clsEmphBOLD">NO</span> - Go to step 12.</p> </li> <li>Remove the jumper wire, and measure the voltage between radiator fan switch 2P connector terminal No. 2 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490348" name="S36518141342008080900000">Fig. 9: Measuring Voltage Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there battery voltage?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Repair open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between radiator fan switch 2P connector terminal No. 2 and the under-hood fuse/relay box.</p> </li> </ol><a name="S41083426332008080900000"></a><h2 class="clsHeadTwo">'06-08 models</h2> <p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td>Before beginning this troubleshooting procedure, refer to the <a class="clsHyperlink" href="#S32988035352008080900000">SYMPTOM TROUBLESHOOTING INDEX</a>.</td> </tr> </table></span></p> <ol class="clsARABICNUM"> <li>Check for the PGM-FI DTCs (see <a class="clsExtHyperlink" id="A00293834_S37308099622008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> ).</li> <li>Check the No. 11 (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.<p><span class="clsEmphITAL">Are the fuses OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 3.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the fuse(s) and recheck.</p> </li> <li>Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see <a class="clsExtHyperlink" id="A00293832_S41533820332008080900000">POWER RELAY TEST</a> ).<p><span class="clsEmphITAL">Is the relay OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 4.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the radiator fan relay.</p> </li> <li>Measure the voltage between radiator fan relay 4P socket terminal No. 2 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490349" name="S16869155412008080900000">Fig. 10: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 2 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there battery voltage?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 5.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the under-hood fuse/relay box.</p> </li> <li>Connect radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490350" name="S20716805932008080900000">Fig. 11: Connecting Radiator Fan Relay 4P Socket Terminal No. 1 And No. 2 With A Jumper Wire</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Does the radiator fan run?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 6.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step <a class="clsListItemLink" href="#S20260649602008080900000">7</a>.</p> </li> <li>Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490351" name="S01953122952008080900000">Fig. 12: Checking Voltage Between Radiator Fan Relay 4P Socket Terminal No. 3 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there battery voltage?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step <a class="clsListItemLink" href="#S15844099472008080900000">10</a>.</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.</p> </li><a name="S20260649602008080900000"></a><li>Disconnect the radiator fan motor 2P connector.</li> <li>Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490352" name="S01169842492008080900000">Fig. 13: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 1 And Radiator Fan Motor 2P Terminal No. 2</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there continuity?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 9.</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.a</p> </li> <li>Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490353" name="S12289488952008080900000">Fig. 14: Checking Continuity Between Radiator Fan Motor 2P Connector Terminal No. 1 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there continuity?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Replace the radiator fan motor (see <a class="clsExtHyperlink" id="A00293816_S26446280022008080900000">RADIATOR AND FAN REPLACEMENT</a> ).</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.</p> </li><a name="S15844099472008080900000"></a><li>Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on <a class="clsExtHyperlink" id="A00293834_S11861548792008080900000">HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)</a> ).</li> <li>Turn the ignition switch ON (II).</li> <li>'07-08 models: Make sure the HDS communicates with the vehicle and the engine control module (ECM)/power train control module (PCM). If it doesn't communicate, troubleshoot the DLC circuit (see <a class="clsExtHyperlink" id="A00293835_S15368038812008080900000">'07-08 MODELS</a> ).</li> <li>Jump the SCS line with the HDS, then turn the ignition switch OFF.<p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td>This step must be done to protect the ECM/PCM from damage.</td> </tr> </table></span></p> </li> <li>Disconnect ECM/PCM connector E (31P).</li> <li>Disconnect under-hood fuse/relay box connector E (16P).</li> <li>Check for continuity between ECM/PCM connector terminal E12 and under-hood fuse/relay box terminal E14.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490354" name="S05697463002008080900000">Fig. 15: Checking Continuity Between ECM/PCM Connector Terminal E12 And Under-Hood Fuse/Relay Box Terminal E14</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there continuity?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Circuit is OK. Update the ECM/PCM if it does not have the latest software (see <a class="clsExtHyperlink" id="A00293834_S22898398782008080900000">UPDATING THE ECM/PCM</a> ), or substitute a known-good ECM/PCM (see <a class="clsExtHyperlink" id="A00293834_S18023811032008080900000">SUBSTITUTING THE ECM/PCM</a> ), then recheck. if the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see <a class="clsExtHyperlink" id="A00293835_S29762031112008080900000">ECM/PCM REPLACEMENT</a> ).</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between the under-hood fuse/relay box and the ECM/PCM.</p> </li> </ol><a name="S22787702612008080900000"></a><h2 class="clsHeadOne">Radiator Fan Switch Circuit Troubleshooting (Open)</h2><a name="S16593221822008080900000"></a><h2 class="clsHeadTwo">'04-05 models</h2> <p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td>Before beginning this troubleshooting procedure, refer to the <a class="clsHyperlink" href="#S32988035352008080900000">SYMPTOM TROUBLESHOOTING INDEX</a>.</td> </tr> </table></span></p> <ol class="clsARABICNUM"> <li>Disconnect the radiator fan switch 2P connector.</li> <li>Turn the ignition switch ON (II).</li> <li>Measure voltage between radiator fan switch 2P connector terminal No. 2 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490355" name="S17804784712008080900000">Fig. 16: Measuring Voltage Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there battery voltage?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 4.</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.</p> </li> <li>Turn the ignition switch OFF, and check for continuity between radiator fan switch 2P connector terminal No. 1 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490356" name="S17853245592008080900000">Fig. 17: Checking Continuity Between Radiator Fan Switch 2P Connector Terminal No. 1 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there continuity?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Replace the radiator fan switch (see <a class="clsHyperlink" href="#S25476967062008080900000">RADIATOR FAN SWITCH REPLACEMENT</a> ).</p> <p><span class="clsEmphBOLD">NO</span> - Repair open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.</p> </li> </ol><a name="S17319554162008080900000"></a><h2 class="clsHeadOne">Radiator Fan Switch Circuit Troubleshooting (Short)</h2><a name="S27399116672008080900000"></a><h2 class="clsHeadTwo">'04-05 models</h2> <p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td>Before beginning this troubleshooting procedure, refer to the <a class="clsHyperlink" href="#S32988035352008080900000">SYMPTOM TROUBLESHOOTING INDEX</a>.</td> </tr> </table></span></p> <ol class="clsARABICNUM"> <li>Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see <a class="clsExtHyperlink" id="A00293832_S41533820332008080900000">POWER RELAY TEST</a> ).<p><span class="clsEmphITAL">Is the relay OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 2.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the radiator fan relay.</p> </li> <li>Remove the radiator fan switch, and test it (see <a class="clsHyperlink" href="#S11507895052008080900000">RADIATOR FAN SWITCH TEST</a> ).<p><span class="clsEmphITAL">Is the radiator fan switch OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 3.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the radiator fan switch (see <a class="clsHyperlink" href="#S25476967062008080900000">RADIATOR FAN SWITCH REPLACEMENT</a> ).</p> </li> <li>Disconnect the under-hood fuse relay box 20P connector.</li> <li>Check for continuity between radiator fan switch 2P connector terminal No. 2 and body ground.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490357" name="S35693093792008080900000">Fig. 18: Checking Continuity Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> <p><span class="clsEmphITAL">Is there continuity?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Repair short in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.</p> <p><span class="clsEmphBOLD">NO</span> - Replace the under-hood fuse/relay box.</p> </li> </ol><a name="S11507895052008080900000"></a><h2 class="clsHeadOne">Radiator Fan Switch Test</h2><a name="S07903545402008080900000"></a><h2 class="clsHeadTwo">'04-05 models</h2> <p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td>Bleed air from the cooling system after installing the radiator fan switch (see <a class="clsExtHyperlink" id="A00293816_S34016141732008080900000">COOLANT REPLACEMENT</a> ).</td> </tr> </table></span></p> <ol class="clsARABICNUM"> <li>Remove the radiator fan switch from the radiator (see <a class="clsHyperlink" href="#S25476967062008080900000">RADIATOR FAN SWITCH REPLACEMENT</a> ).</li> <li>Suspend the radiator fan switch (A) in a container of water as shown.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490358" name="S04223178542008080900000">Fig. 19: Suspending Radiator Fan Switch In Container Of Water</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> </li> <li>Heat the water, and check the temperature with a thermometer. Do not let the thermometer (B) touch the bottom of the hot container.</li> <li>Measure the continuity between terminal No. 1 and terminal No. 2 according to <a class="clsGraphicLink" onclick="return ajaxHrefModalImg(event,$(this))" href="#S35632906932008080900000">Fig. 20</a>.<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490359" name="S35632906932008080900000">Fig. 20: Measuring Continuity Between Terminal No. 1 And Terminal No. 2</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> </li> </ol><a name="S25476967062008080900000"></a><h2 class="clsHeadOne">Radiator Fan Switch Replacement</h2><a name="S02926656282008080900000"></a><h2 class="clsHeadTwo">'04-05 models</h2> <ol class="clsARABICNUM"> <li>Drain the engine coolant (see <a class="clsExtHyperlink" id="A00293816_S34016141732008080900000">COOLANT REPLACEMENT</a> ).</li> <li>Remove the splash shield (see step 26 on <a class="clsExtHyperlink" id="A00293817_S20144997912008080900000">TRANSMISSION REMOVAL</a> ).</li> <li>Disconnect the radiator fan switch connector (A), then remove the radiator fan switch (B).<p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490360" name="S13213876582008080900000">Fig. 21: Identifying Radiator Fan Switch Connector And Radiator Fan Switch W/Torque Specification</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p> </li> <li>Install the radiator fan switch with a new O-ring (C).</li> <li>Refill the radiator with engine coolant, and bleed air from the cooling system with the heater valve open (see <a class="clsExtHyperlink" id="A00293816_S34016141732008080900000">COOLANT REPLACEMENT</a> ).</li> </ol> </body> </html>

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ENGINE COOLING FAN CONTROLS

  • HEADINGS
    • Component Location Index
    • Symptom Troubleshooting Index
    • Circuit Diagram
    • Radiator Fan Circuit Troubleshooting
      • '04-05 models
      • '06-08 models
    • Radiator Fan Switch Circuit Troubleshooting (Open)
      • '04-05 models
    • Radiator Fan Switch Circuit Troubleshooting (Short)
      • '04-05 models
    • Radiator Fan Switch Test
      • '04-05 models
    • Radiator Fan Switch Replacement
      • '04-05 models
  • FIGURES
    • Fig. 1: Identifying Fan Controls Component Location
    • Fig. 2: Fan Controls Circuit Diagram
    • Fig. 3: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 2 And Body Ground
    • Fig. 4: Connecting Radiator Fan Relay 4P Socket Terminal No. 1 And No. 2 With Jumper Wire
    • Fig. 5: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 3 And Body Ground
    • Fig. 6: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 1 And Radiator Fan Motor 2P Terminal No. 2
    • Fig. 7: Checking Continuity Between Radiator Fan Motor 2P Connector Terminal No. 1 And Body Ground
    • Fig. 8: Connecting Radiator Fan Switch 2P Connector Terminal No. 1 And No. 2 With Jumper Wire
    • Fig. 9: Measuring Voltage Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground
    • Fig. 10: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 2 And Body Ground
    • Fig. 11: Connecting Radiator Fan Relay 4P Socket Terminal No. 1 And No. 2 With A Jumper Wire
    • Fig. 12: Checking Voltage Between Radiator Fan Relay 4P Socket Terminal No. 3 And Body Ground
    • Fig. 13: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 1 And Radiator Fan Motor 2P Terminal No. 2
    • Fig. 14: Checking Continuity Between Radiator Fan Motor 2P Connector Terminal No. 1 And Body Ground
    • Fig. 15: Checking Continuity Between ECM/PCM Connector Terminal E12 And Under-Hood Fuse/Relay Box Terminal E14
    • Fig. 16: Measuring Voltage Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground
    • Fig. 17: Checking Continuity Between Radiator Fan Switch 2P Connector Terminal No. 1 And Body Ground
    • Fig. 18: Checking Continuity Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground
    • Fig. 19: Suspending Radiator Fan Switch In Container Of Water
    • Fig. 20: Measuring Continuity Between Terminal No. 1 And Terminal No. 2
    • Fig. 21: Identifying Radiator Fan Switch Connector And Radiator Fan Switch W/Torque Specification
  • TABLES
    • SYMPTOM TROUBLESHOOTING CHART - 04-05 MODELS
    • SYMPTOM TROUBLESHOOTING CHART - 06-08 MODELS

2004-08 ENGINE

Fan Controls - TSX

Component Location Index

Fig. 1: Identifying Fan Controls Component Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Symptom Troubleshooting Index

'04-05 models

SYMPTOM TROUBLESHOOTING CHART - 04-05 MODELS
Symptom Diagnostic procedure Also check for
Engine overheats
  1. Check the coolant level.
  2. Check for coolant leakage (from gaskets, hoses, O-rings, etc.).
  3. Check for dirt, leaves, or insects on radiator and condenser.
  4. Check for deteriorated coolant.
  5. Check for damaged or deformed fan shrouds.
  6. Inspect the fan motors (see FAN MOTOR TEST ) or fan relays (see POWER RELAY TEST ).
  7. Check the radiator cap (see RADIATOR CAP TEST ).
  8. Check the thermostat (see THERMOSTAT TEST ).
  9. Inspect the water pump (see WATER PUMP INSPECTION ).
  10. Check for plugged or deteriorated radiator hoses.
  11. Check for plugged heater core or hose(s).
  12. Check for a damaged cylinder head gasket.
 
The radiator fan does not run at all Radiator fan circuit troubleshooting (see RADIATOR FAN CIRCUIT TROUBLESHOOTING ). Cleanliness and tightness of all connectors
The radiator fan does not run for engine cooling, but it runs with the A/C on Radiator fan switch circuit troubleshooting (Open) (see RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (OPEN) ). Cleanliness and tightness of all connectors
The radiator fan runs with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 199°F (93°C) Radiator fan switch circuit troubleshooting (Short) (see RADIATOR FAN SWITCH CIRCUIT TROUBLESHOOTING (SHORT) ). 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 ).
Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on) Radiator and A/C condenser fan common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING ).

'06-08 models

SYMPTOM TROUBLESHOOTING CHART - 06-08 MODELS
Symptom Diagnostic procedure Also check for
Engine overheats
  1. Check the coolant level.
  2. Check for coolant leakage (from gaskets, hoses, O-rings, etc.).
  3. Check for dirt, leaves, or insects oh radiator and A/C condenser.
  4. Check for deteriorated coolant.
  5. Check for damaged or deformed fan shrouds.
  6. Inspect the fan motors (see FAN MOTOR TEST ) or fan relays (see POWER RELAY TEST ).
  7. Check the radiator cap (see RADIATOR CAP TEST ).
  8. Check the thermostat (see THERMOSTAT TEST ).
  9. Inspect the water pump (see WATER PUMP INSPECTION ).
  10. Check for plugged or deteriorated radiator hoses.
  11. Check for plugged heater core or hoses.
  12. Check for a damaged cylinder head gasket.
 
The radiator fan does not run at all
  1. Check for PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  2. Radiator fan circuit troubleshooting (see RADIATOR FAN CIRCUIT TROUBLESHOOTING ).
Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan run with the ignition switch ON (II), the A/C off, and the engine coolant temperature below 199°F (93°C) Remove the radiator fan relay, and test.
  • If the relay is faulty, replace it.
  • If the relay is OK, repair a short in the wire between radiator fan relay 4P socket terminal No. 4 and ECM/PCM connector terminal E12.
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 ).
Both the radiator fan and the A/C condenser fan do not run with the A/C on (but the A/C compressor runs with the A/C on) Radiator and A/C condenser fan common circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN COMMON CIRCUIT TROUBLESHOOTING ).
The A/C compressor clutch does not engage (but both the radiator fan and the A/C condenser fan run with the A/C on) A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING ).

Circuit Diagram

Fig. 2: Fan Controls Circuit Diagram
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Radiator Fan Circuit Troubleshooting

'04-05 models

NOTE: Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX.

  1. Check the No. 11 (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 f use(s) and recheck.

  2. Remove the radiator 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 radiator fan relay.

  3. Measure the voltage between radiator fan relay 4P socket terminal No. 2 and body ground.

    Fig. 3: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 2 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.

  4. Connect radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire.

    Fig. 4: Connecting Radiator Fan Relay 4P Socket Terminal No. 1 And No. 2 With Jumper Wire
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the radiator fan run?

    YES - Go to step 5.

    NO - Go to step 6.

  5. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground.

    Fig. 5: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 3 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 9.

    NO - Repair open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.

  6. Disconnect the radiator fan motor 2P connector.
  7. Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.

    Fig. 6: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 1 And Radiator Fan Motor 2P Terminal No. 2
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 8.

    NO - Repair open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.

  8. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground.

    Fig. 7: Checking Continuity Between Radiator Fan Motor 2P Connector Terminal No. 1 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Replace the radiator fan motor (see RADIATOR AND FAN REPLACEMENT ).

    NO -Repair open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.

  9. Reinstall the radiator fan relay.
  10. Disconnect the radiator fan switch 2P connector.
  11. Connect radiator fan switch 2P connector terminal No. 1 and No. 2 with a jumper wire.

    Fig. 8: Connecting Radiator Fan Switch 2P Connector Terminal No. 1 And No. 2 With Jumper Wire
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the radiator fan run?

    YES - Replace the radiator fan switch (see RADIATOR FAN SWITCH REPLACEMENT ).

    NO - Go to step 12.

  12. Remove the jumper wire, and measure the voltage between radiator fan switch 2P connector terminal No. 2 and body ground.

    Fig. 9: Measuring Voltage Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Repair open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.

    NO - Repair open in the wire between radiator fan switch 2P connector terminal No. 2 and the under-hood fuse/relay box.

'06-08 models

NOTE: Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX.

  1. Check for the PGM-FI DTCs (see GENERAL TROUBLESHOOTING INFORMATION ).
  2. Check the No. 11 (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 3.

    NO - Replace the fuse(s) and recheck.

  3. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see POWER RELAY TEST ).

    Is the relay OK?

    YES - Go to step 4.

    NO - Replace the radiator fan relay.

  4. Measure the voltage between radiator fan relay 4P socket terminal No. 2 and body ground.

    Fig. 10: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 2 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 5.

    NO - Replace the under-hood fuse/relay box.

  5. Connect radiator fan relay 4P socket terminal No. 1 and No. 2 with a jumper wire.

    Fig. 11: Connecting Radiator Fan Relay 4P Socket Terminal No. 1 And No. 2 With A Jumper Wire
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the radiator fan run?

    YES - Go to step 6.

    NO - Go to step 7.

  6. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between radiator fan relay 4P socket terminal No. 3 and body ground.

    Fig. 12: Checking Voltage Between Radiator Fan Relay 4P Socket Terminal No. 3 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 10.

    NO - Repair open in the wire between the under-hood fuse/relay box and under-dash fuse/relay box.

  7. Disconnect the radiator fan motor 2P connector.
  8. Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.

    Fig. 13: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 1 And Radiator Fan Motor 2P Terminal No. 2
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Go to step 9.

    NO - Repair open in the wire between the under-hood fuse/relay box and radiator fan motor 2P connector terminal No. 2.a

  9. Check for continuity between radiator fan motor 2P connector terminal No. 1 and body ground.

    Fig. 14: Checking Continuity Between Radiator Fan Motor 2P Connector Terminal No. 1 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Replace the radiator fan motor (see RADIATOR AND FAN REPLACEMENT ).

    NO - Repair open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.

  10. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ).
  11. Turn the ignition switch ON (II).
  12. '07-08 models: Make sure the HDS communicates with the vehicle and the engine control module (ECM)/power train control module (PCM). If it doesn't communicate, troubleshoot the DLC circuit (see '07-08 MODELS ).
  13. Jump the SCS line with the HDS, then turn the ignition switch OFF.

    NOTE: This step must be done to protect the ECM/PCM from damage.

  14. Disconnect ECM/PCM connector E (31P).
  15. Disconnect under-hood fuse/relay box connector E (16P).
  16. Check for continuity between ECM/PCM connector terminal E12 and under-hood fuse/relay box terminal E14.

    Fig. 15: Checking Continuity Between ECM/PCM Connector Terminal E12 And Under-Hood Fuse/Relay Box Terminal E14
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Circuit is OK. Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. if the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

    NO - Repair open in the wire between the under-hood fuse/relay box and the ECM/PCM.

Radiator Fan Switch Circuit Troubleshooting (Open)

'04-05 models

NOTE: Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX.

  1. Disconnect the radiator fan switch 2P connector.
  2. Turn the ignition switch ON (II).
  3. Measure voltage between radiator fan switch 2P connector terminal No. 2 and body ground.

    Fig. 16: Measuring Voltage Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage?

    YES - Go to step 4.

    NO - Repair open in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.

  4. Turn the ignition switch OFF, and check for continuity between radiator fan switch 2P connector terminal No. 1 and body ground.

    Fig. 17: Checking Continuity Between Radiator Fan Switch 2P Connector Terminal No. 1 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Replace the radiator fan switch (see RADIATOR FAN SWITCH REPLACEMENT ).

    NO - Repair open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.

Radiator Fan Switch Circuit Troubleshooting (Short)

'04-05 models

NOTE: Before beginning this troubleshooting procedure, refer to the SYMPTOM TROUBLESHOOTING INDEX.

  1. Remove the radiator fan relay from the under-hood fuse/relay box, and test it (see POWER RELAY TEST ).

    Is the relay OK?

    YES - Go to step 2.

    NO - Replace the radiator fan relay.

  2. Remove the radiator fan switch, and test it (see RADIATOR FAN SWITCH TEST ).

    Is the radiator fan switch OK?

    YES - Go to step 3.

    NO - Replace the radiator fan switch (see RADIATOR FAN SWITCH REPLACEMENT ).

  3. Disconnect the under-hood fuse relay box 20P connector.
  4. Check for continuity between radiator fan switch 2P connector terminal No. 2 and body ground.

    Fig. 18: Checking Continuity Between Radiator Fan Switch 2P Connector Terminal No. 2 And Body Ground
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity?

    YES - Repair short in the wire between radiator fan switch 2P connector terminal No. 2 and under-hood fuse/relay box.

    NO - Replace the under-hood fuse/relay box.

Radiator Fan Switch Test

'04-05 models

NOTE: Bleed air from the cooling system after installing the radiator fan switch (see COOLANT REPLACEMENT ).

  1. Remove the radiator fan switch from the radiator (see RADIATOR FAN SWITCH REPLACEMENT ).
  2. Suspend the radiator fan switch (A) in a container of water as shown.

    Fig. 19: Suspending Radiator Fan Switch In Container Of Water
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

  3. Heat the water, and check the temperature with a thermometer. Do not let the thermometer (B) touch the bottom of the hot container.
  4. Measure the continuity between terminal No. 1 and terminal No. 2 according to Fig. 20.

    Fig. 20: Measuring Continuity Between Terminal No. 1 And Terminal No. 2
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

Radiator Fan Switch Replacement

'04-05 models

  1. Drain the engine coolant (see COOLANT REPLACEMENT ).
  2. Remove the splash shield (see step 26 on TRANSMISSION REMOVAL ).
  3. Disconnect the radiator fan switch connector (A), then remove the radiator fan switch (B).

    Fig. 21: Identifying Radiator Fan Switch Connector And Radiator Fan Switch W/Torque Specification
    Courtesy of AMERICAN HONDA MOTOR CO., INC.

  4. Install the radiator fan switch with a new O-ring (C).
  5. Refill the radiator with engine coolant, and bleed air from the cooling system with the heater valve open (see COOLANT REPLACEMENT ).
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