GM Service Manual Online
For 1990-2009 cars only

Test Description

The Number(s) below refer to the step number(s) on the diagnostic table.

  1. Determines if this is the correct chart for the symptom.

  2. This step isolates which module and/or associated window battery supply circuit is shorted to ground.

  3. Replace the circuit breaker if it was found to be open

Step

Action

Yes

No

DEFINITION: Each door module has its own battery supply circuit, but the circuits are all fed by the same power window circuit breaker located in the rear fuse (bussed) block. Refer to Power Distribution Schematics in Wiring Systems and Door Control Module Schematics .

1

Did you perform the Diagnostic System Check - Power Door Systems?

Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to operate the power windows from both the driver door switch assembly, and, from each one of the window switches mounted to the passenger doors.

Does any window operate?

Go to Symptoms

Go to Step 3

3

  1. Remove the power window circuit breaker from the rear fuse (bussed) block.
  2. Probe the power window circuit breaker battery supply terminal of the rear fuse (bussed) block with a test lamp connected to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 8

4

Test the power window circuit breaker for an open or high resistance.

Was the circuit breaker found to be open or have a high resistance?

Go to Step 5

--

5

  1. Turn OFF the ignition.
  2. Disconnect all of the door modules. Refer to Door Control Module Replacement .
  3. Test the battery positive window supply circuits for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

  1. Replace the power window circuit breaker.
  2. Turn ON the ignition, with the engine OFF.
  3. Reconnect the door modules, one at a time, attempting to operate each window associated with each module as each module is reconnected.
  4. If, after reconnecting a module, the associated window operates, proceed to reconnecting the next module.

Did any window not operate after its module was reconnected?

Go to Step 7

--

7

Inspect for poor connections/terminal tension at the harness connector of the inoperative door module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Repair the open in the power window circuit breaker battery supply circuit. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 10

--

9

Replace the door module that is internally shorted to ground. Refer to Door Control Module Replacement .

Did you complete the repair

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2