GM Service Manual Online
For 1990-2009 cars only

Electrical Information Reference

    •  Diagnostic System Check - Vehicle.
    •  Circuit Testing.
    •  Testing for Intermittent Conditions and Poor Connections.

The alternator warning indicator is only illuminated for 6 seconds after the ignition is switched to the ON position with the engine OFF.

    Caution: Refer to Safety Glasses Caution in the Preface section.

  1. Carry out the Diagnostic System Check.
  2. Ignition on alternator warning light should illuminate for 6 second.
  3. If the alternator warning does not illuminate, connect the scan tool and command the alternator warning light ON.
    If the light does not illuminate replace instrument panel cluster.

Repair Instructions

Instrument Cluster Replacement.