Power Window Motor: Testing and Inspection

Before you proceed with this diagnosis, confirm proper power window switch operation. The front door power window switches are integral to the door modules. The rear door power window switches stand alone.

1. Disconnect and isolate the battery negative cable. Remove the trim panel from the door with the inoperative power window.
2. Disconnect the door wire harness connector from the power window motor pigtail wire connector. Apply 12 volts to the two power window motor pigtail wire connector terminals to check the operation of the motor in one direction. Reverse the connections to the motor connector terminals to check the operation in the other direction. Remember, if the window is in the full up or full down position, the power window motor will not operate in that direction by design. If OK, repair the circuits between the power window motor and the door module (front door) or the power window switch (rear door) as required. If not OK, replace the faulty power window regulator.
3. If the power window motor operates in both directions, check the operation of the window glass and lift mechanism through its complete up and down travel. There should be no binding or sticking of the window glass or lift mechanism through the entire travel range. If not OK, inspect and repair the window glass installation, glass guide hardware, and lift mechanism as required.