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Radiator Fan High Speed Circuit Troubleshooting

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index.
  • Before performing symptom troubleshooting, check for powertrain DTCs.
  1. Check the No. 30 (30 A) fuse in the under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step 2.

    NO  -Replace the fuse. If the fuse continues to blow, locate and repair the short in the circuit between the under-dash fuse/relay box and radiator fan motor.

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

    Is the relay OK? 

    YES  -Go to step 3.

    NO  -Replace the relay(s).

  3. Check the radiator fan motor.

    Is the relay OK? 

    YES  -Go to step 4.

    NO  -Replace the radiator fan motor (see FAN, FAN MOTOR, AND SHROUD REMOVAL AND INSTALLATION ).

  4. Measure the voltage between radiator fan relay 4P socket terminal No. 2 and body ground.
    Fig 1: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 2 And Body Ground
    G06429140Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 5.

    NO  -Repair an open in the wire between radiator fan relay 4P socket terminal No. 2 and the under-dash fuse/relay box.

  5. Turn the ignition switch to ON (II).
  6. Measure voltage between radiator fan relay 4P socket terminal No. 4 and body ground.
    Fig 2: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 4 And Body Ground
    G06429142Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 7.

    NO  -Repair an open in the wire between radiator fan relay 4P socket terminal No. 4 and the under-dash fuse/relay box.

  7. Measure the voltage between fan control relay 5P socket terminal No. 5 and body ground.
    Fig 3: Measuring Voltage Between Fan Control Relay 5P Socket Terminal No. 5 And Body Ground
    G00496879Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 8.

    NO  -Repair an open in the wire between fan control relay 5P socket terminal No. 5 and the auxiliary under-hood relay box.

  8. Turn the ignition switch to LOCK (0).
  9. Disconnect the radiator fan motor 2P connector.
  10. Check for continuity between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.
    Fig 4: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 1 And Radiator Fan Motor 2P Connector Terminal No. 2
    G00496880Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 11.

    NO  -Repair an open in the wire between radiator fan relay 4P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 2.

  11. Check for continuity between fan control relay 5P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 1.
    Fig 5: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 1 And Radiator Fan Motor 2P Connector Terminal No. 1
    G00496881Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 12.

    NO  -Repair an open in the wire between fan control relay 5P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 1.

  12. Check for continuity between fan control relay 5P socket terminal No. 2 and body ground.
    Fig 6: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 2 And Body Ground
    G00496882Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

    NO  -Repair an open in the wire between fan control relay 5P socket terminal No. 2 and body ground G401.

  13. Connect the HDS to the DLC.
  14. Turn the ignition switch to ON (II).
  15. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
  16. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
    NOTE: This step must be done to protect the PCM from damage.
  17. Disconnect PCM connector A (44P).
  18. Check for continuity between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal No. A4.
    Fig 7: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 3 And PCM Connector Terminal No. A4
    G00496883Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 19.

    NO  -Repair an open in the wire between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal No. A4.

  19. Check for continuity between fan control relay 5P socket terminal No. 3 and PCM connector terminal No. A5.
    Fig 8: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 3 And PCM Connector Terminal No. A5
    G00496884Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the PCM (see PCM UPDATE ) if it does not have the latest software, or substitute a know-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom goes away with a know-good PCM, replace the original PCM (see PCM REPLACEMENT ).

    NO  -Repair an open in the wire between fan control relay 5P socket terminal No. 3 and PCM connector terminal No. A5.

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