Blower Power Transistor Test

Blower Power Transistor Test

1. Remove the passenger's dashboard undercover. Passenger's 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 as specified go to step 4.

- If the resistance is not as specified replace the power transistor.
NOTE: Also check the blower motor. Power transistor failure can be caused by a defective blower motor.





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

5. Disconnect climate control unit connector A (28P) and B (12P).

6. Connect climate control unit connector A (28P) terminal No. 9 and climate control unit connector B (12P) terminal No. 5 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.