GM Service Manual Online
For 1990-2009 cars only

All Power Window Are Inoperative

Step

Action

Value(s)

Yes

No

1

Is the vehicle a 2 door?

--

Go to Step 2

Go to Step 8

2

Check PWR WINDOWS Circuit Breaker C for an open.

Is the Circuit Breaker open?

--

Go to Step 14

Go to Step 3

3

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

Does the test light illuminate?

--

Go to Step 4

Go to Step 7

4

Using a test light, backprobe between the LR window switch harness connector terminal H and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 6

5

Relace the LF window switch. Refer to Power Window Switch in Doors.

Has the repair been made and the system rechecked?

--

System OK

--

6

Repair a poor connection or an open in circuit 750 between the LF window switch harness connecotr terminal G and G302.

Has the repair been made and the system rechecked?

--

System OK

--

7

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

Has the repair been made and the system rechecked?

--

System OK

--

8

Check PWR WINDOWS Circuit Breaker C for an open.

Is the Circuit Breaker tripped?

--

Go to Step 14

Go to Step 9

9

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

Does the test light illuminate?

--

Go to Step 10

Go to Step 13

10

Using a test light, backprobe between the LF window switch harness connector C1 terminal C and ground.

Does the test light illuminate?

--

Go to Step 11

Go to Step 12

11

Replace the LF window switch. Refer to Power Window Switch in Doors.

Has the repair been made and the system rechecked?

--

System OK

--

12

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

Has the repair been made and the system rechecked?

--

System OK

--

13

Repair a poor connection or an open in circuit 143.

Has the repair been made and the system rechecked?

--

System OK

--

14

Repair a short to ground in circuit 143.

Has the repair been made and the system rechecked?

--

System OK

--