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 approx. 10 V detected when the fan dial is set to 1st, and approx. 1 V when it is set to 7th?

Yes No

Replace the power transistor.