GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Verify that the rear window lockout function does not work properly.

Does the lockout function operate properly?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Important: Verify the power window switch lockout is not engaged.

  1. Turn OFF the ignition.
  2. Disconnect the front power window switch.
  3. Test the front power window switch lockout signal circuit for a short to voltage.

Did you find and correct the condition?

--

Go to Step 5

Go to Step 4

4

Replace the front power window switch.

Is the repair complete?

--

Go to Step 5

--

5

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2