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 .

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 .

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 .
2. Ground circuit to the amplifier open--Test the ground circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs .
3. Amp mute signal shorted to ground--Test the amp mute signal for a short to ground. Refer to Circuit Testing and Wiring Repairs .
4. No audio output from the amplifier--Replace the amplifier. Refer to Control Module References .

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

With RPO U2K

1. Audio signal circuit shorted--Test the audio signal circuits for a short. Refer to Circuit Testing and Wiring Repairs .
2. No audio output from the digital radio receiver--Replace the digital radio receiver. Refer to Control Module References .
3. No digital radio audio output from the radio--Replace the radio. Refer to Control Module References .