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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 617 (Entertainment System) >> Diagnostic Information and Procedures >> Speakers Inoperative - One or More >> With RPO U85 (Speaker System 8, Quad Front Door Mounted)

With RPO U85 (Speaker System 8, Quad Front Door Mounted)

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. 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 to WIRING REPAIRS .
  2. Ground circuit to the amplifier open. Test the ground circuit to the amplifier for an open. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
  3. Low level audio signal circuit shorted. Test all low level audio signal outputs for a short to ground and a short to voltage. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
  4. No audio output from the radio. Test for any AC voltage between the appropriate low level audio signal circuits and the amplifier connector, disconnected with the radio volume adjusted to 50 percent. If AC voltage is present, replace the amplifier. Refer to Amplifier Replacement . If no AC voltage is present, replace the radio. Refer to Radio Replacement .


  1. Speaker output circuit from amplifier open or shorted. Test the appropriate speaker output circuits for an open, a short to ground, and a short to voltage. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
  2. No audio output from the amplifier. 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 to Speaker Replacement - Front Door  . If no AC voltage is present, replace the amplifier. Refer to Amplifier Replacement .


  1. Amplifier present signal circuit shorted. Test the amplifier present signal for a short to ground and a short to voltage. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
  2. Low level audio signal circuit open. Test the appropriate low level audio signal circuits from the radio for an open. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
  3. Speaker output circuit high resistance. Test the appropriate speaker output circuits for high resistance. Refer to CIRCUIT TESTING and to WIRING REPAIRS .
  4. Defective speaker - Replace the appropriate speaker. Refer to Speaker Replacement - Rear  or to Speaker Replacement - Front Door  .
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