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.

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