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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Entertainment Systems) >> Diagnostic Information and Procedures >> Speakers Inoperative - All >> Diagnostic System Check - Vehicle >> With RPO U88

With RPO U88

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Battery positive voltage to the amplifier open-Test the battery positive circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  2. Ground to the amplifier open-Test the ground circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  3. 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 connector with the radio volume adjusted to 50 percent. If no AC voltage is present, check for shorts to battery positive or shorts to ground on any speaker output circuit from the radio. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. If no shorts are located, replace the radio. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
  4. No radio on signal to the amplifier-Test the radio on signal circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  5. Defective amplifier-Replace the amplifier. Refer to Amplifier Replacement .
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