GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the PWR WINDOWS PWR SUNROOF Circuit Breaker for an open.

Is the Circuit Breaker open?

--

Go to Step 7

Go to Step 2

2

  1. Disconnect the LF window switch.
  2. Turn the ignition switch to the RUN position.
  3. Using a test light, backprobe between the LF window switch harness connector C1 terminal G and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 6

3

Using a test light, backprobe between the LF widow switch harness connector C1 terminal G to terminal B.

Does the test light illuminate?

--

Go to Step 4

Go to Step 5

4

Replace the LF window switch. Refer to Front Side Door Window Switch Replacement .

Is the repair complete and the system rechecked?

--

Go to Power Windows System Check

--

5

Repair a poor connection or an open in circuit 750 between C1 terminal B and G301.

Is the repair complete and the system rechecked?

--

Go to Power Windows System Check

--

6

Repair a poor connection or an open in circuit 143 between the fuse block terminal L2 and the LF window switch harness connector C1 terminal G.

Is the repair complete and the system rechecked?

--

Go to Power Windows System Check

--

7

Repair a short to ground in circuit 143.

Is the repair complete and the system rechecked?

--

Go to Power Windows System Check

--