CHECK POWER TRANSISTOR.

1) Connect the disconnected connectors.

2) Turn the ignition switch to ON.

3) Use a tester to measure the voltage between the power transistor connector and chassis ground.

Connector & terminal

(B57) No. 2 (+) — Chassis ground (−):

QUESTION

Is the voltage approx. 10 V when fan dial in 1st, and approx. 1 V when fan dial in 7th?

Yes No

Replace the power transistor.