GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the power windows circuit breaker C for an open.

Is the circuit breaker open?

--

Go to Step 7

Go to Step 2

2

  1. Disconnect the left front window switch.
  2. Turn the ignition switch to the RUN position.
  3. Connect a test lamp.
  4. Backprobe between the left front window switch harness connector C1 terminal C and ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 6

3

  1. Connect a test lamp.
  2. Backprobe between the left front window switch harness connector C1 terminal C and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

4

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

Have the repairs been made and the system rechecked?

--

System OK

--

5

Repair a poor connection or an open in circuit 750 between the left front window switch harness connector C1 terminal A and G302.

Have the repairs been made and the system rechecked?

--

System OK

--

6

Repair a poor connection or an open in circuit 143.

Have the repairs been made and the system rechecked?

--

System OK

--

7

Repair a short to ground in circuit 143.

Have the repairs been made and the system rechecked?

--

System OK

--