Honda Accord: Power Transistor Test - Heating/Air Conditioning - Heating, Ventilation, and Air Conditioning - Honda Accord MK8 2008-2012 Service ManualHonda Accord: Power Transistor Test

1. Remove the passenger's dashboard undercover (see page 20-170).

2. Disconnect the 4P connector from the power transistor.

3. Measure the resistance between terminals No. 3 and No. 4 of the power transistor. It should be about 1.5 kO.

• If the resistance is within the specifications, go to step 4.

• If the resistance is not within the specifications, replace the power transistor.

NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.


4. Carefully release the lock tab on terminal No. 1 (PUR)

4. Carefully release the lock tab on terminal No. 1 (PUR) (A) in the 4P connector, then remove the terminal and insulate it from body ground.

(To 12 V Power source on vehicle)

(To 12 V Power source on vehicle)

5. Reconnect the 4P connector to the power transistor.

6. Make sure the PUR wire is completely isolated, then supply 12 V to cavity No. 1 with a jumper wire.

7 Turn the ignition switch to ON (II), and check that the blower motor runs.

• If the blower motor does not run, replace the power transistor.

NOTE: A faulty blower motor can cause the power transistor to fail. If the power transistor is replaced, also check the blower motor for binding, and replace it if necessary.

• If the blower motor runs, the power transistor is OK.

    Evaporator Temperature Sensor Test
    NOTE: Before testing the sensor, check for HVAC DTCs (see page 2 1 - 9). 1. Remove the evaporator temperature sensor (see page 21-67). 2. Dip the sensor in ice water, and measure the resistan ...

    Air Mix Control Motor Test
    NOTE: Before testing the motor, check for HVAC DTCs (see page 21-9). 1. Disconnect the 7P connector from the air mix control motor. Incorrectly applying power and ground to the air mix contro ...

    See also:

    Rear Door Glass Outer Weatherstrip Replacement
    4-door NOTE: - Put on gloves to protect your hands. - Take care not to scratch the door. 1. Remove these items: - Door panel {see page 20-38) - Plastic cover, as needed (see step 3 on page 2 ...

    Spark Plug Inspection
    1. Remove the ignition coils (see page 4-20). 2. Remove the spark plugs, then inspect the electrodes and the ceramic insulator. - Burned or worn electrodes may be caused by these conditions: ...

    Oil Pressure Test
    NOTE: If the low oil pressure warning indicator stays on with the engine running, check the engine oil level. If the oil level is correct, do the following test. 1. With the engine stopped, remov ...