Power Transistor HVAC: Testing and Inspection
Power Transistor Test1. Disconnect the 4P connector from the power transistor.
2. Measure the resistance between the No.3 and No.4 (4-door) or No.1 and No.2 (2-door) terminals of the power transistor. It should be about 1.4 - 1.5 kOhms.
- If the resistance is within the specifications, go to step 3.
- If the resistance is not within the specifications, replace the power transistor.
3. Carefully release the lock tab on the No.1 (4-door) or No.4 (2-door) terminal (BLU/YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground.
4. Reconnect the 4P connector to the power transistor.
5. Supply 12 volts to the No.1 (4-door) or No.4 (2-door) cavity of the power transistor connector with a jumper wire.
6. Turn the ignition switch ON (II), and check that the blower motor runs.
- If the blower motor does not run, replace the power transistor.
- If the blower motor runs, the power transistor is OK.