Checking the heater fan drive motor and the condition of its electrical circuit, replacing components (Honda Civic 6)

Examination

1. Check the condition of the fuses and all terminal connections of the corresponding electrical circuit. Make sure the battery is fully charged.

2. Shift the transmission into position "P", set the parking brake and turn the ignition key to the ON position without starting the engine.

2. Shift the transmission into position «P», set…

3. Without disconnecting the heater fan motor, connect the jumper wire to the blue/black wire terminal on the back of the motor connector (see accompanying illustration), ground the opposite end of the wire to ground. If the motor starts, then the cause of the failure lies in the faulty switch, resistors or connecting wiring.

4. If the motor does not operate with the blue/black wire terminal grounded, remove the jumper wire, disconnect the connector and use a voltmeter to measure the voltage between the blue/black wire terminal and ground (see illustration above). On all models, if the voltmeter registers battery voltage and the motor does not operate in any of the speed modes, replace the motor (see Removal and installation the electric motor of the heater fan drive). If there is no voltage, check the condition of the motor relay and connecting wiring (see Chapter On-board electrical equipment).

4. If the motor does not operate with the…

5. The resistor assembly is located on the casing of the fan drive motor (see accompanying illustration). The board assembly contains several resistors that provide the ability to select low and medium speed modes for the fan.

6. If the motor rotates, but there is no possibility to select one of the speed modes, remove the resistor assembly from the heater casing and visually inspect it for damage. Using an ohmmeter, check the resistance between terminals 2 and 4 (see accompanying illustration). If the resistance of any of the resistors is below normal or equal to infinity, replace the assembly.