GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Power Window Schematics

Connector End View Reference: Power Door Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition with, the engine OFF.
  2. Ensure the window lockout function is disabled.
  3. Operate the power window from both the passenger window switch and the driver window switch.

Does the power window operate properly from both switches?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Is the power window inoperative from the driver switch only?

Go to Step 5

Go to Step 4

4

Is the power window inoperative from the passenger switch only?

Go to Step 33

Go to Step 8

5

  1. Disconnect the driver power window switch.
  2. Connect a test lamp between the driver window switch ignition 3 voltage circuit at the window switch harness connector and ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 28

6

  1. Connect the driver power window switch.
  2. Disconnect the passenger power window switch.
  3. Connect a test lamp between the power window up signal circuit at the passenger power window switch harness connector and ground.
  4. Actuate the driver power window switch in the up position.

Did the test lamp illuminate?

Go to Step 7

Go to Step 18

7

  1. Connect a test lamp between the power window down signal circuit at the passenger power window switch harness connector and ground.
  2. Actuate the driver power window switch in the down position.

Does the test lamp illuminate?

Go to Step 24

Go to Step 19

8

  1. Disconnect the passenger power window switch.
  2. Connect a test lamp between the power window lockout signal circuit at the passenger power window switch harness connector and ground.

Did the test lamp illuminate?

Go to Step 22

Go to Step 9

9

Connect a test lamp between the ignition 3 voltage circuit at the passenger power window switch harness connector and ground.

Did the test lamp illuminate?

Go to Step 10

Go to Step 14

10

Connect a test lamp between battery positive voltage and the ground circuit at the passenger power window switch harness connector.

Did the test lamp illuminate?

Go to Step 11

Go to Step 27

11

  1. Connect the passenger power window switch.
  2. Disconnect the passenger power window motor.
  3. Connect a test lamp between the power window motor up circuit at the power window motor harness connector and ground.
  4. Place the passenger power window switch in the up position.

Did the test lamp illuminate?

Go to Step 12

Go to Step 20

12

  1. Connect a test lamp between the power window motor down circuit at the power window motor harness connector and ground.
  2. Actuate the passenger power window switch in the down position.

Did the test lamp illuminate?

Go to Step 13

Go to Step 21

13

  1. Connect a test lamp between the power window motor up and down circuits at the power window motor harness connector.
  2. Place the passenger power window switch in the up and down positions.

Did the test lamp illuminate in both directions?

Go to Step 25

Go to Step 24

14

  1. Remove the power window relay.
  2. Connect a test lamp between the power window relay battery positive voltage circuit at the relay center and ground.

Does the test lamp illuminate?

Go to Step 15

Go to Step 29

15

  1. Turn ON the ignition with, the engine OFF.
  2. Connect a test lamp between the power window relay ignition 1 voltage circuit at the relay center and ground.

Does the test lamp illuminate?

Go to Step 16

Go to Step 31

16

Connect a test lamp between battery positive voltage and the power window relay ground circuit at the relay center.

Does the test lamp illuminate?

Go to Step 17

Go to Step 30

17

  1. Connect a fused jumper across the battery positive voltage circuit and the ignition 3 voltage circuit at the relay block.
  2. Operate the power window from the power window switches.

Did the power window operate properly?

Go to Step 26

Go to Step 28

18

Test for the following in the power window up signal circuit:

    • An open
    • A short to ground
    • A short to battery positive voltage

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 23

19

Test for the following in the power window down signal circuit:

    • An open
    • A short to ground
    • A short to battery positive voltage

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 23

20

Test for an open or short to ground in the power window motor up circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 24

21

Test for an open or short to ground in the power window motor down circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 24

22

Test for a short to battery positive voltage in the power window lockout signal circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 23

23

Inspect for poor connections at the driver power window switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 32

24

Inspect for poor connections at the passenger power window switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 33

25

Inspect for poor connections at the power window motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 34

26

Inspect for poor connections at the power window relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 36

Go to Step 35

27

Repair the poor connection or an open in the passenger power window switch ground circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 36

--

28

Repair the open in the ignition 3 voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 36

--

29

Repair the poor connection or an open in the power window relay battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 36

--

30

Repair the poor connection or an open in the power window relay ground circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 36

--

31

Repair the poor connection or an open in the power window relay ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 36

--

32

Replace the driver power window switch. Refer to Front Side Door Window Switch Replacement .

Did you complete the repair?

Go to Step 36

--

33

Replace the passenger power window switch. Refer to Front Side Door Window Switch Replacement .

Did you complete the repair?

Go to Step 36

--

34

Replace the power window motor. Refer to Window Regulator Replacement - Left Side .

Did you complete the repair?

Go to Step 36

--

35

Replace the power window relay. Refer to Relay Replacement .

Did you complete the repair?

Go to Step 36

--

36

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2