Schematic Reference: Radio/Audio System Schematics

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

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 in Wiring Systems.

Without RPO UQA

1. Speaker output circuit high resistance. Test the appropriate speaker output circuits for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. Defective speaker - Replace the appropriate speaker. Refer to Speaker Replacement Reference .

With RPO UQA (Bose)

1. Speaker output circuit high resistance. Test the appropriate speaker output circuits for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. Front low level audio circuit open. Test the appropriate low level audio circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
3. Defective speaker - Replace the appropriate speaker. Refer to Speaker Replacement Reference .

With RPO U2K

1. Audio common circuit open. Test the audio common circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. Replace the Digital Radio Receiver. Refer to Control Module References in Computer/Integrating Systems.