GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the charging system operation and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

2

Verify that the charge indicator is always on.

Does the charge indicator operate normally?

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

Go to Step 3

3

Using the scan tool, inspect for any DTCs.

Are any DTCs present?

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Go to the Appropriate DTC

Go to Step 4

4

  1. Using the scan tool, perform the IPC Indicator Bulb Check.
  2. Turn the indicator bulbs ON and OFF.

Do all of the indicator bulbs turn ON and OFF properly?

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Go to Step 5

Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console

5

Disconnect the generator connector.

Is the battery indicator still ON?

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Go to Step 6

Go to Step 9

6

  1. Disconnect connector C3 from the VCM.
  2. Disconnect the connector from the generator.
  3. Using a digital multimeter (DMM), test for continuity from pin B to ground.

Is continuity present?

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Go to Step 7

Go to Step 8

7

Repair the short to ground Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 11

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8

Using the DMM, measure the voltage at the battery stud on the generator.

Is the voltage within the specified range?

9-16 V

Go to Step 9

Go to Step 10

9

Repair or replace the generator Refer to Generator Replacement .

Is the repair complete?

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Go to Step 11

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10

Repair the open in CKT 2 (RED) Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3