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Radiator Fan High Speed Circuit Troubleshooting

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the No. 16 (30 A) fuse in the under-hood fuse/relay box and the No. 7 (7.5 A) fuse in the under-dash fuse/relay box.

    Are the fuse(s) OK? 

    YES  -Reinstall the fuse(s), then go to step 2.

    NO  -Replace the fuse(s) and recheck. If the fuse(s) blow again, repair the short to ground on the No. 16 (30A) fuse and the No. 7 (7.5A) fuse circuit.

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

    Are the relays OK? 

    YES  -Go to step 3.

    NO  -Replace the radiator fan relay and/or fan control relay.

  3. Measure the voltage between radiator fan relay 4P socket terminal No. 1 and body ground.
    Fig 1: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 1 And Body Ground
    G08052403Courtesy 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 fan control relay 5P socket terminals No. 1 and No. 2 with a jumper wire.
    Fig 2: Connecting Fan Control Relay 5P Socket Terminals No. 1 And No. 2 With Jumper Wire
    G08052404Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Connect radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
    Fig 3: Connecting Radiator Fan Relay 4P Socket Terminals No. 1 And No. 2 With Jumper Wire
    G08052405Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the radiator fan run at high speed? 

    YES  -Remove the jumper wire, the go to step  10.

    NO  -Remove the jumper wire, the go to step 6.

  6. Test the radiator fan motor (see FAN MOTOR TEST ).

    Is the fan motor OK? 

    YES  -Go to step 7.

    NO  -Replace the radiator fan motor (see RADIATOR AND FAN REPLACEMENT ).

  7. Check for continuity between fan control relay 5P socket terminal No. 2 and body ground.
    Fig 4: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 2 And Body Ground
    G08052406Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 8.

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

  8. Check for continuity between radiator fan relay 4P socket terminal No. 2 and radiator fan motor 2P connector terminal No. 2.
    Fig 5: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 2 And Radiator Fan Motor 2P Connector Terminal No. 2
    G08052407Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 9.

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

  9. Check for continuity between fan control relay 5P socket terminal No. 1 and radiator fan motor 2P connector terminal No. 1.
    Fig 6: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 1 And Radiator Fan Motor 2P Connector Terminal No. 1
    G08052408Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 10.

    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.

  10. Turn the ignition switch to ON (II).
  11. Measure the voltage between fan control relay 5P socket terminal No. 5 and body ground.
    Fig 7: Measuring Voltage Between Fan Control Relay 5P Socket Terminal No. 5 And Body Ground
    G08052409Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 12.

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

  12. Turn the ignition switch to LOCK (0).
  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 (49P).
  18. Check for continuity between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal A5.
    Fig 8: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 3 And PCM Connector Terminal A5
    G08052410Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 19.

    NO  -Repair an open the wire between radiator fan relay 4P socket terminal No. 3 and PCM connector terminal A5.

  19. Check for continuity between fan control relay 5P socket terminal No. 3 and PCM connector terminal A5.
    Fig 9: Checking Continuity Between Fan Control Relay 5P Socket Terminal No. 3 And PCM Connector Terminal A5
    G08052411Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the PCM if it does not have the latest software (see KNOCK SENSOR REPLACEMENT ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom/indication goes away with a known-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 A5.

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