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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 717 (Entertainment System) >> Diagnostic Information and Procedures >> Speakers Inoperative - One or More >> With RPO U85

With RPO U85

WARNING: This page is about a different car, the 2003 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.
  2. Low level audio signal circuit shorted. Test all low level audio signal circuits for a short to ground or short to voltage.
  3. Radio on signal circuit open or shorted to ground. Test the radio on signal circuit for an open or short to ground.
  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  .


  1. Speaker output circuit from amplifier open or shorted. Test the appropriate speaker output circuits for an open or short.
  2. Low level audio circuit open. Test the appropriate low level audio circuit for an open.
  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 50 percent. If AC voltage is present, replace the speaker. Refer to SPEAKER REPLACEMENT REFERENCE  . If no AC voltage is present, replace the amplifier. Refer to AMPLIFIER REPLACEMENT  .


  1. Speaker output circuit high resistance. Test the appropriate speaker output circuits for high resistance.
  2. Low level audio circuit open. Test the appropriate low level audio circuit for an open.
  3. Defective speaker - Replace the appropriate speaker. Refer to SPEAKER REPLACEMENT REFERENCE  .
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