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Blower Motor Circuit Troubleshooting

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition switch to ON (II) and the heater fan switch ON.

    Does the blower motor run at each speed? 

    YES  - Go to step  2.

    NO  - Go to step  4.

  2. Turn the heater fan switch OFF.
  3. Make sure the ignition switch is ON (II).

    Does the blower motor run? 

    YES  - Go to step  27.

    NO  - Intermittent problem. Check for loose wire or poor connections on the blower motor circuit.

  4. Measure the voltage between blower motor 2P connector terminal No. 1 and body ground.

    Is there battery voltage? 

    YES  - Go to step  5.

    NO  - Go to step  9.

    Fig 1: Measuring Voltage Between Blower Motor 2P Connector Terminal No. 1 & Body Ground
    G05959757Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Turn the ignition switch to LOCK (0).
  6. Ground blower motor connector terminal No. 2 with a jumper wire.
    Fig 2: Connecting Blower Motor Connector Terminal No. 2 To Ground With Jumper Wire
    G05959758Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Turn the ignition switch to ON (II).

    Does the blower motor run? 

    YES  - Go to step  17.

    NO  - Replace the blower motor (see BLOWER UNIT COMPONENT REPLACEMENT ).

  8. Turn the ignition switch to LOCK (0).
  9. Check the No. 57 (30 A) and the No. 10 (7.5 A) fuses in the under-dash fuse/relay box.

    Are the fuses OK? 

    YES  - Go to step  10.

    NO  - Replace the blown fuses, and recheck. If either fuse blows again, check for a short in the No. 57 (30 A) or the No. 10 (7.5 A) fuse circuits.

  10. Measure the voltage between blower motor relay 4P socket terminal No. 1 and body ground.

    Is there battery voltage? 

    YES  - Go to step  11.

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

    Fig 3: Measuring Voltage Between Blower Motor Relay 4P Socket Terminal No. 1 & Body Ground
    G05959759Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Turn the ignition switch to ON (II).
  12. Measure the voltage between blower motor relay 4P socket terminal No. 4 and body ground.
    Fig 4: Measuring Voltage Between Blower Motor Relay 4P Socket Terminal No. 4 & Body Ground
    G00509503Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  - Go to step  13.

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

  13. Turn the ignition switch to LOCK (0).
  14. Check for continuity between blower motor relay 4P socket terminal No. 3 and body ground.

    Is there continuity? 

    YES  - Go to step  15.

    NO  - Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G501 (see CONNECTOR TO FUSE/RELAY BOX INDEX ).

    Fig 5: Checking Continuity Between Blower Motor Relay 4P Socket Terminal No. 3 & Body Ground
    G00509504Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Turn the ignition switch to ON (II).
  16. Measure the voltage between blower motor relay 4P socket terminal No. 2 and body ground.

    Is there battery voltage? 

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

    NO  - Replace the blower motor relay.

    Fig 6: Measuring Voltage Between Blower Motor Relay 4P Socket Terminal No. 2 & Body Ground
    G05959762Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Turn the ignition switch to LOCK (0).
  18. Disconnect the jumper wire.
  19. Disconnect the blower resistor 4P connector.
  20. Test the blower resistor (see BLOWER RESISTOR TEST  ).

    Is the blower resistor OK? 

    YES  - Go to step  21.

    NO  - Replace the blower resistor.

  21. Reconnect the blower resistor 4P connector.
  22. Disconnect the heater fan switch 8P connector.
  23. Turn the ignition switch to ON (II).
  24. Ground each of the heater fan switch 8P connector terminals individually in the following order: No. 4, 7, 8, and 2.
    Fig 7: Connecting Heater Fan Switch 8P Connector Terminals To Ground
    G05959763Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the blower motor run at progressively higher speeds? 

    YES  - Go to step  25.

    NO  - Repair open in the wires between the blower resistor and the heater fan switch.

  25. Turn the ignition switch to LOCK (0).
  26. Check for continuity between heater fan switch 8P connector terminal No. 1 and body ground.
    Fig 8: Checking Continuity Between Heater Fan Switch 8P Connector Terminal No. 1 & Body Ground
    G05959764Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Replace the heater fan switch (see HEATER CONTROL PANEL DISASSEMBLY AND REASSEMBLY  ).

    NO  - Check for an open in the wire between the heater fan switch and body ground. If the wire is OK, check for poor ground at G502: With navigation (see CONNECTOR TO FUSE/RELAY BOX INDEX ), Without navigation (see CONNECTOR TO FUSE/RELAY BOX INDEX ).

  27. Turn the ignition switch to LOCK (0).
  28. Disconnect the blower motor 2P connector.
  29. Disconnect the blower resistor 4P connector.
  30. Disconnect the heater fan switch 8P connector.
  31. Check for continuity between body ground and heater fan switch 8P connector terminals No. 2, 4, 7, and 8 individually.
    Fig 9: Checking Continuity Between Heater Fan Switch 8P Connector Terminals No. 2, 4, 7, 8 & Body Ground
    G05959765Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short to body ground in the wires between the blower motor, the blower resistor, and the heater fan switch.

    NO  - Replace the heater fan switch (see HEATER CONTROL PANEL DISASSEMBLY AND REASSEMBLY  ).

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