GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the power windows circuit 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 terminal H and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 6

3

  1. Connect a test lamp.
  2. Backprobe between the left front window switch harness connector terminal H to terminal G.

Does the test light illuminate?

--

Go to Step 4

Go to Step 5

4

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

Has the repair 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 terminal G and G302.

Has the repair been made and the system rechecked?

--

--

System OK

6

Repair a poor connection or an open in circuit 143 between the fuse block terminal M1 and the left front window switch connector terminal H.

Has the repair been made and the system rechecked?

--

--

System OK

7

Repair a short to ground in circuit 143.

Has the repair been made and the system rechecked?

--

--

System OK