GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provide an overview of each diagnostic category.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Entertainment/Communication Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing

  1. Disconnect the harness connector at the voice recorder.
  2. Ignition ON, verify a testlamp illuminates between both terminals on the voice recorder harness connector.
  3. If the test lamp does not illuminate, test the circuits for a short to voltage, short to ground, or an open/high resistance.
  4. If all circuits test normal, replace the voice recorder.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Personal Message Player/Recorder Replacement