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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 867 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Speakers Inoperative - All >> Circuit/System Testing (With UQA+Y91 Amplifier)

Circuit/System Testing (With UQA+Y91 Amplifier)

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the C3 harness connector.
  2. Turn the Ignition ON and radio ON.
  3. At the amplifier C3 harness connector, test for AC voltage between the left front low level audio signal (+) and left front low level audio signal (-).
    • If AC voltage is not present, replace the radio.
  4. Disconnect the C1 amplifier harness connector.
  5. Connect a test lamp between the B+ circuit connector terminal 4 and ground. Verify the test lamp illuminates.
    • If the test lamp does not illuminate, repair open/high resistance.
  6. Connect a test lamp between the ground circuit connector terminal 8 and B+. Verify the test lamp illuminates.
  7. If all circuits test normal, replace the amplifier.
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