Blower Power Transistor Test

Blower Power Transistor Test

1. Disconnect the 5P connector from the power transistor.

2. Measure the resistance between power transistor terminals No. 1 and No. 4. It should be about 1.4-1.5 kOhms.
NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.

- If the resistance is within the specifications, go to step 3.

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





3. Carefully release the lock tab on terminal No. 3 (BLU/YEL) (A) in the 5P connector, then remove the terminal and insulate it from body ground.

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

5. Supply 12 V to cavity No. 3 with a jumper wire.

6. 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.