Power Transistor HVAC: Testing and Inspection

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. Reconnect the 5P connector to the power transistor.

5. Disconnect climate control unit connector A (32P).

6. Connect climate control unit connector A (32P) terminals No. 15 and No. 28 with a jumper wire.





7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, 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.