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 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 Circuit Testing and Wiring Repairs in Wiring Systems.

All Radios

1. Battery positive voltage circuit to the amplifier open--Test the battery positive voltage circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. Ground circuit to the amplifier open--Test the ground circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
3. 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 shorted--Test the audio signal circuits for a short. 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 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 U57

1. Audio signal circuit shorted--Test the audio signal circuits for a short. 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 Control Module References in Computer/Integrating Systems.