Schematic Reference: Radio/Audio System Schematics

Connector End Views Reference: Entertainment Connector End Views

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

Without RPO U88

1. No audio output from the radio--Test for any AC voltage between the audio signal circuits at the affected speaker connector with the radio volume adjusted to 50 percent. If no AC voltage is present, check for shorts to battery positive voltage or shorts to ground on all affected speaker output circuits from the radio. If no shorts are located, replace the radio. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
2. Speaker output open--Test the appropriate speaker outputs 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 U88

1. Speaker output from amplifier open--Test the appropriate speaker outputs for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. Defective speaker--Replace the appropriate speaker. Refer to Speaker Replacement Reference .
3. No audio output from the radio--Test for any AC voltage between the audio signal circuits at the affected speaker connector with the radio volume adjusted to 50 percent. If no AC voltage is present, check for shorts to battery positive voltage or shorts to ground on all affected speaker output circuits from the radio. If no shorts are located, replace the radio. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
4. No audio output from the amplifier--Test for any AC voltage between the audio signal circuits at the affected speaker connector with the radio volume adjusted to 50 percent. If no AC voltage is present, check for shorts to battery positive voltage or shorts to ground on the affected speaker outputs. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. If no shorts are located, replace the amplifier. Refer to Radio Speaker Amplifier Replacement .