GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check PWR WINDOWS PWR SUNROOF circuit breaker for an open.

Is the circuit breaker tripped?

--

Go to Step 7

Go to Step 2

2

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

Is the test light on?

--

Go to Step 3

Go to Step 6

3

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

Is the test light on?

--

Go to Step 4

Go to Step 5

4

Replace the LF window switch. Refer to Door Lock and Side Window and Outside Rearview Mirror Remote Control Switch Replacement in Doors for service procedure.

Is the repair complete?

--

Go to Power Windows System Check

--

5

Repair poor connection or open in circuit 750 between the LF window switch and G301.

Is the repair complete?

--

Go to Power Windows System Check

--

6

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

Is the repair complete?

--

Go to Power Windows System Check

--

7

Repair short to ground in circuit 143.

Is the repair complete?

--

Go to Power Windows System Check

--