All Speakers Inoperative

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 Diagnostic Aids for Circuit Testing and Wiring Repair procedures and Connector Repairs in Diagnostic Aids.

With RPO UQ2
1. Speaker output shorted - Test all speaker outputs for a short. Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.
2. Defective Radio - Replace Radio. Refer to Radio Replacement.

With RPO U85
1. Battery Positive Voltage circuit to the amplifier open. Test the Battery Positive Voltage circuit to the amplifier for an open. Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.
2. Amplifier Control circuit to the amplifier open or shorted to ground. Test Amplifier Control circuit for an open or short to ground. Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.
3. No low level audio output from the radio. Test for any AC voltage between the Left Front Low Level Audio Signal circuits at the amplifier harness connector, disconnected with the radio volume adjusted to 50 percent. If no AC voltage is present, replace the radio.
4. No audio output from the amplifier. Replace the amplifier.

For a description of the RPO Code(s) shown in this article/images refer to the RPO Code List found at Vehicle/Application ID RPO Codes