GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the left front window regulator motor.
  2. Using a test light, frontprobe the left front window regulator motor harness connector between terminal A and terminal B.
  3. Turn the ignition switch to the RUN position.
  4. Press the left front window switch to the UP position, and then to the DOWN position.

Does the test light illuminate in both cases?

--

Go to Step 15

Go to Step 2

2

  1. Disconnect the left front window switch.
  2. Using a digital multimeter (DMM), test circuit 165 for continuity between the left front window switch harness connector C1 terminal D and the left front window regulator motor harness connector terminal A.

Is there continuity in circuit 165?

--

Go to Step 3

Go to Step 4

3

Using a test light, frontprobe between the left front widow switch harness connector C1 terminal D and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 6

4

Repair a poor connection or an open in circuit 165.

Is the repair complete?

--

Go to Power Windows System Check

--

5

Repair a short to B+ on circuit 165.

Is the repair complete?

--

Go to Power Windows System Check

--

6

Using a test light, frontprobe between B+ and the left front window switch harness connector C1 terminal D.

Does the test light illuminate?

--

Go to Step 7

Go to Step 8

7

Repair a short to ground in circuit 165.

Is the repair complete?

--

Go to Power Windows System Check

--

8

Using a digital multimeter (DMM), test circuit 164 for continuity between the left front window switch harness connector C1 terminal E and the left front window regulator motor harness connector terminal B.

Is there continuity in circuit 164?

--

Go to Step 10

Go to Step 9

9

Repair a poor connection or an open in circuit 164.

Is the repair complete?

--

Go to Power Windows System Check

--

10

Using a test light, frontprobe between the left front window switch harness connector C1 terminal E and the ground.

Does the test light illuminate?

--

Go to Step 11

Go to Step 12

11

Repair a short to B+ on circuit 164.

Is the repair complete?

--

Go to Power Windows System Check

--

12

Using a test light, frontprobe between B+ and the left front window switch harness connector C1 terminal E.

Does the test light illuminate?

--

Go to Step 13

Go to Step 14

13

Repair a short to ground in circuit 164.

Is the repair complete?

--

Go to Power Windows System Check

--

14

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

Is the repair complete?

--

Go to Power Windows System Check

--

15

Replace the left front window regulator motor. Refer to Rear Side Door Window Regulator Motor Replacement .

Is the repair complete?

--

Go to Power Windows System Check

--