Blower Power Transistor Test

Blower Power Transistor Test

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

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 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. 1 (YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground.

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

6. Make sure the YEL 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.

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