Schematic Reference: Radio/Audio System Schematics

Connector End Views Reference: Entertainment Connector End Views

Always perform the Diagnostic System Check - Vehicle 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.

1. Speaker output open or shorted--Test the appropriate speaker output circuits for an open or short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. No audio output from the amplifier--Test for any AC voltage between the appropriate speaker output circuits at the speaker harness connector, disconnected with the radio volume adjusted to an audible level. If AC voltage is present, replace the speaker. Refer to Speaker Replacement Reference . If no AC voltage is present, replace the amplifier. Refer to Control Module References in Computer/Integrating Systems.
3. Defective speaker--Replace the inoperative speaker. Refer to Speaker Replacement Reference .

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 in Wiring Systems.

RPO U66

1. Low level audio signal circuit open or shorted--Test all low level audio signal circuits for an open or short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. No audio output from the amplifier--Replace the amplifier. Refer to Control Module References in Computer/Integrating Systems.

RPO U57

1. Rear midrange speaker output shorted--Test all rear midrange speaker output circuits for a short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. No audio output from the amplifier--Replace the amplifier. Refer to Control Module References in Computer/Integrating Systems.

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

With RPO U2K and U57

1. Audio signal circuit open--Test the appropriate audio signal 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 Control Module References in Computer/Integrating Systems.
3. No digital radio audio output from the radio--Replace the radio. Refer to Control Module References in Computer/Integrating Systems.

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

With RPO U2K and U66

1. Audio signal circuit short to ground--Test the appropriate audio signal circuit for a short to ground. 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 Control Module References in Computer/Integrating Systems.
3. No digital radio audio output from the radio--Replace the radio. Refer to Control Module References in Computer/Integrating Systems.

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 signal circuit open--Test the appropriate audio signal 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 digital radio audio output from the radio--Replace the radio. Refer to Control Module References in Computer/Integrating Systems.

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

With RPO U42 and U66

1. Audio signal circuit short to ground--Test the appropriate audio signal circuit for a short to ground. 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 digital radio audio output from the radio--Replace the radio. Refer to Control Module References in Computer/Integrating Systems.