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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 653 (Entertainment System) >> Diagnostic Information And Procedures >> Speakers Inoperative - One or More >> Without RPO U80

Without RPO U80

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Speaker output shorted - Test all speaker outputs for a short. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  2. Defective radio - Replace the radio. Refer to Radio Replacement (w/o UM8)  or Radio Replacement (w UM8)  .


  1. Speaker output open. Test the appropriate speaker output circuits for an open. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  2. No audio output from the radio. Test for any AC voltage between the appropriate speaker output circuits at the speaker harness connector, disconnected with the radio volume adjusted to an audible level. If AC voltage is present, replace the speaker. Refer toSpeaker Replacement Reference  . If no AC voltage is present, replace the radio. Refer to Radio Replacement (w/o UM8)  or Radio Replacement (w UM8)  .


  1. Speaker output circuit high resistance. Test the appropriate speaker output circuits for high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  2. Defective speaker - Replace the appropriate speaker. Refer to Speaker Replacement Reference  .
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