Blower Power Transistor Test

Blower Power Transistor Test

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

2. Measure the resistance between power transistor terminals No. 3 and No. 4. It should be about 1.4-1.5 kOhms.

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






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





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

5. Supply 12 V to cavity No. 1 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.
- If the blower motor runs, the power transistor is OK.