GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the LF window regulator motor.
  2. Using a test light, frontprobe the LF window regulator motor harness connector between terminal A and terminal B.
  3. Turn the ignition switch to the RUN position.
  4. Press the LF window switch to the UP, 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 LF window switch.
  2. Using a digital multimeter J 39200, check circuit 165 for continuity between the LF window switch harness connector C1 terminal D and the LF 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 LF 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.

Has the repair been completed?

--

Go to Power Windows System Check

--

5

Repair a short to B+ on circuit 165.

Has the repair been completed?

--

Go to Power Windows System Check

--

6

Using a test light, frontprobe between B+ and the LF 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.

Has the repair been completed?

--

Go to Power Windows System Check

--

8

Using a digital multimeter J 39200, check circuit 164 for continuity between the LF window switch harness connector C1 terminal E and the LF 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.

Has the repair been completed?

--

Go to Power Windows System Check

--

10

Using a test light, frontprobe between the LF 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.

Has the repair been completed?

--

Go to Power Windows System Check

--

12

Using a test light, frontprobe between B+ and the LF 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.

Has the repair been completed?

--

Go to Power Windows System Check

--

14

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

Has the repair been completed?

--

Go to Power Windows System Check

--

15

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

Has the repair been completed?

--

Go to Power Windows System Check

--