Schematic Reference: Radio/Navigation System Schematics

Connector End Views Reference: Entertainment/Communication Connector End Views

Perform the Diagnostic System Check - Vehicle before proceeding with these diagnostic procedures.

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

With RPO U87

1. Low level audio circuit open. Test the appropriate low level audio circuit for an open. Refer to Circuit Testing and Wiring Repairs .
2. Defective speaker - Replace the appropriate speaker. Refer to Speaker Replacement Reference .

With RPO U2K

Audio output signal circuit from digital radio receiver open. Test left, right, and audio common signal circuits for opens. Refer to Circuit Testing and Wiring Repairs .