Schematic Reference: Radio/Audio System Schematics

Connector End Views Reference: Entertainment Connector End Views

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

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.

RPO U66

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. 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 .

RPO U57

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

Important: The following procedure assumes all speakers are operative for all modes of operation except digital radio.

With RPO U2K and U57

1. Audio common circuit open. Test the audio common circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. No audio output from the digital radio receiver. Replace the digital radio receiver. Refer to Digital Radio Receiver Replacement and Digital Radio Receiver Setup .
3. No digital radio audio output from the radio. Replace the radio. Refer to Radio Replacement .

Important: The following procedure assumes all speakers are operative for all modes of operation except rear DVD audio selected as source for vehicle speakers.

With RPO U42 and U57

1. Audio common circuit open. Test the audio common circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. No audio output from the disc player and video display. Replace the disc player and video display. Refer to Video with DVD Display Replacement .
3. No rear DVD audio output from the radio. Replace the radio. Refer to Radio Replacement .