GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check - Instrument Cluster ?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Turn ON the ignition, with the engine OFF.

Is the charge indicator on?

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Go to Intermittents and Poor Connections Diagnosis in Wiring Systems

Go to Step 3

3

Install a scan tool.

  1. Turn ON the ignition, with the engine OFF.
  2. View the IPC Data List Input ALT L TERMINAL on the scan tool.

Does the scan tool display ON?

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Go to Step 5

Go to Step 4

4

  1. Start the engine.
  2. View the IPC Data List Input ALT L TERMINAL on the scan tool.

Does the scan tool display OFF?

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Go to Step 4

Go to Generator Not Operating Properly

5

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Did you complete the repair?

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Go to Step 6

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6

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3