GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the system check performed?

--

Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

Inspect the LF power window switch.

Does the LR window operate from the LF power window switch?

--

Go to Step 18

Go to Step 3

3

  1. Turn the ignition to the ON position.
  2. Connect a test lamp.
  3. Backprobe the LF power window switch between terminal D of connector C2 and ground.
  4. Press the LR switch in the LF power window switch to the UP position.

Does the test lamp light?

--

Go to Step 4

Go to Step 6

4

  1. Connect a test lamp.
  2. Backprobe the LF power window switch between terminal C of connector C2 and ground.
  3. Press the LR switch in the LF power window switch to the DOWN position.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

  1. Connect a test lamp.
  2. Backprobe the LR power window switch between terminal A and ground.
  3. Press the LR switch in the LF power window switch to the UP position.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

6

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

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

7

  1. Connect a test lamp.
  2. Backprobe the LR power window switch between terminal E and ground.
  3. Press the LR switch in the LF power window switch to the DOWN position.

Does the test lamp light?

--

Go to Step 9

Go to Step 10

8

Repair the open in CKT 168 between the LF power window switch and the RR power window switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

9

  1. Connect a test lamp.
  2. Backprobe the LR power window switch between terminal D and ground.
  3. Press the LR switch in the LF power window switch to the UP position.

Does the test lamp light?

--

Go to Step 11

Go to Step 13

10

Repair the open in CKT 169 between the LF power window switch and the LR power window switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

11

  1. Connect a test lamp.
  2. Backprobe the LR power window switch between terminal H and ground.
  3. Press the LR switch in the LF power window switch to the DOWN position.

Does the test lamp light?

--

Go to Step 12

Go to Step 13

12

  1. Disconnect the LR power window motor.
  2. Connect a test lamp.
  3. Backprobe between terminal A of the LR power window motor connector and ground.
  4. Press the LR switch in the LF power window switch to the UP position.

Does the test lamp light?

--

Go to Step 14

Go to Step 15

13

Replace the LR power window switch. Refer to Rear Side Door Window Switch Replacement .

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

14

  1. Connect a test lamp.
  2. Backprobe between terminal B of the LR power window motor connector and ground.
  3. Press the LR switch in the LF power window switch to the DOWN position.

Does the test lamp light?

--

Go to Step 16

Go to Step 17

15

Repair the open in CKT 668 between the LR power window motor and the LR power window switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

16

Repair the LR power window motor.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

17

Repair the open in CKT 669 between the LR power window motor and the LR power window switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

18

  1. Connect a test lamp.
  2. Backprobe the LF power window switch between connector C2 terminal A and ground.

Does the test lamp light?

--

Go to Step 19

Go to Step 21

19

  1. Connect a test lamp.
  2. Backprobe the LR power window switch between terminal B and ground.

Does the test lamp light?

--

Go to Step 20

Go to Step 22

20

Replace the LR window switch.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

21

Replace the LF power window switch.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--

22

Repair the open in CKT 1307 between the LF power window switch and the LR power window switch.

Is the repair complete?

--

Go to Diagnostic System Check - Power Door Systems

--