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.