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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1418 (Entertainment System) >> Diagnostic Information and Procedures >> Speakers Inoperative - One or More >> All Speakers Inoperative >> With RPO U85

With RPO U85

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  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. Low Level Audio Signal circuit shorted. Test all Low Level Audio Signal circuits for a short to ground or short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  3. Radio On Signal circuit open or shorted to ground. Test the Radio On Signal circuit for an open or short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  4. 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. Refer to Radio Replacement .
  5. No audio output from the amplifier. Replace the amplifier. Refer to Amplifier Replacement .
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