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 RUN position.
  2. Operate each window up and down from the left front window switch.

Each window operates quietly and smoothly, without sticking.

2

With the LF window up, press the left front window switch down past the first defeat

The left front window moves to the fully down position.

Power Window Express Down Function Inoperative

3

  1. Make sure the lockout switch is in the OFF position on the LF power window switch.
  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 left front window switch.
  2. Attempt to operate each window from its individual switch.
    • Window do not operate from their individual switches.
    • Windows only operate from the left front switch.

Power Window Lockout Function Inoperative

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