Blower Power Transistor Test

Blower Power Transistor Test

1. Remove the passenger's dashboard undercover. Passenger's Dashboard Undercover Removal/Installation

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

3. Measure the resistance between terminals No. 1 and No. 4 of the power transistor. It should be about 1.5 kOhms.
- 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. 3 (RED/BLK) (A) in the 5P connector, then remove the terminal and insulate it from body ground.

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

6. Make sure the RED/BLK wire is completely isolated, then supply 12 V to cavity No. 3 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.