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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 UQ3

With RPO UQ3

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. 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 .
  2. 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 .
  3. No audio output from the amplifier. Replace the amplifier. Refer to Amplifier Replacement .


  1. Speaker output circuit from amplifier open or shorted. Test the appropriate speaker output circuits for an open or short. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  2. Low level audio circuit open. Test the appropriate low level audio circuit for an open. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  3. No low level audio output from the radio. Test for any AC voltage between the appropriate 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 .
  4. 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 an audible level. 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 amplifier. Refer to Amplifier Replacement .


  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. Speaker output circuit high resistance. Test the appropriate speaker output circuits for high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  3. Low level audio circuit open. Test the appropriate low level audio circuit for an open. Refer to CIRCUIT TESTING and WIRING REPAIRS .
  4. Defective speaker - Replace the appropriate speaker. Refer to Speaker Replacement - Rear  or Speaker Replacement - Front Door  .
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