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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 745 (Entertainment System) >> Diagnostic Information and Procedures >> Speakers Inoperative - One or More >> With RPO U79

With RPO U79

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. 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 radio. Refer to Radio Replacement .


  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 50 percent. If AC voltage is present, replace the speaker. Refer to Speaker Replacement - Rear  or Speaker Replacement - Front Door  . If no AC voltage is present, replace the radio. Refer to Radio Replacement .


  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 - Rear  or Speaker Replacement - Front Door  .
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