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 - Engine Electrical

2

Verify that the charge indicator is inoperative.

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 DTCs.

Are any DTCs present?

--

Go to the Appropriate DTC

Go to Step 4

4

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

Do all of the indicators 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

Test for voltage at pin B of the generator.

Is the voltage within the specified range?

9-16 V

Go to Step 6

Go to Step 7

6

Replace the generator Refer to Generator Replacement .

Is the repair complete?

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Go to Step 8

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7

Locate and repair the open in CKT 225 (RED) between the generator and the PCM/VCM Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3