GM Service Manual Online
For 1990-2009 cars only

Schematic Reference: Radio/Audio System Schematics

Connector End View Reference: Entertainment Connector End Views

Diagnostic System Check - Vehicle

Always perform the Diagnostic System Check - Vehicle before proceeding with these diagnostic procedures. Refer to Diagnostic System Check - Vehicle .

All Speakers Inoperative Only on Digital Radio

Important: The following information lists the most probable cause of the concern to the least probable cause followed by the appropriate test for that condition. If the list leads to the replacement of a component, always inspect for a poor connection before proceeding with the replacement. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

  1. Right or left audio signal circuit shorted to battery positive voltage--Test all audio signal circuits for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs .
  2. No audio output from the digital radio receiver--Replace the digital radio receiver. Refer to Control Module References .