GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you review the Charging System Description and the Charging System Circuit Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Engine Electrical

2

Verify that the charge indicator is always on.

Is the charge indicator always on?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Disconnect the generator connector.
  2. Turn the ignition switch to ON.

Does the charge indicator light?

Go to Step 5

Go to Step 4

4

Repair or replace the generator. Refer to Generator Replacement and Generator Overhaul .

Is the repair complete?

Go to Step 10

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5

  1. Turn the ignition switch to LOCK.
  2. Disconnect the DRL control module connector.
  3. Turn the ignition switch to ON.

Does the charge indicator light?

Go to Step 7

Go to Step 6

6

Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement in Lighting Systems.

Is the repair complete?

Go to Step 10

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7

Test for a short to ground in the WHT/RED wire between the instrument panel cluster and the generator.

Is a short to ground present?

Go to Step 8

Go to Step 9

8

Repair the short. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 10

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9

Repair or replace the instrument cluster printed circuit.

Is the repair complete?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3