GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to the ACC or on position.
  2. Operate each window, up and down from the LF window switch.

Each window operates quietly and smoothly, without sticking.

2

Momentarily press the LF window switch DOWN past the first defeat.

The LF window continues to the fully down position.

Power Window Express Down Function Inoperative

3

  1. Make sure window lockout switch is off.
  2. Operate each window from its individual switch.

Each window operates quietly and smoothly, without sticking.

4

  1. Press the lock out switch to the LOCK position on the LF power window switch.
  2. Attempt to operate each window from its individual switch.
    • Windows do not operate from their individual switches.
    • Windows only operate from the LF window switch.

Power Window Lockout Function Inoperative

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.