Power Transistor HVAC: Testing and Inspection

1. Disconnect the 5P connector from the power transistor.




2. Measure the resistance between the No.1 and No.4 terminals of the power transistor. It should be approximately 1.5 k Ohm ± 1 %.




3. Carefully release the lock tab on the No.3 terminal (ORN/BLK) (A) in the 5P connector, then remove the terminal and insulate it from body ground.
4. Connect a 1.2 - 3.4 W bulb (B) between the No.3 and the No.4 cavity on the 5P connector.
5. Reconnect the 5P connector to the power transistor.
6. Turn the ignition switch ON (II), and check that the blower motor runs.