Power Transistor HVAC: Testing and Inspection
Power Transistor Test1. Disconnect the 3P connector from the power transistor.
2. Carefully release the lock tab on the No. 2 terminal (BLU/RED) (A) in the 3P connector, then remove the terminal and insulate it from body ground.
3. Connect a 1.2 - 3.4 W bulb (B) between the No. 1 and the No. 2 cavity on the 3P connector.
4. Reconnect the 3P connector to the power transistor.
5. Turn the ignition switch ON (II), and check that the blower motor runs.
- If the blower motor runs, replace the heater control panel.
- If the blower motor does not run, replace the power transistor.