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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    To prevent misdiagnosis, the door chime must be OFF during testing. Ensure the driver door latch is closed during testing.

  1. Ignition OFF, disconnect the X3 harness connector at the T3 amplifier.
  2. Ignition ON, radio ON, mute ON, test for 7.5-8.5 V between the amplifier control circuit terminal 6 and ground.
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  3. Mute OFF, test for less than 1 V between the amplifier control circuit terminal 6 and ground.
    • If greater than the specified range, replace the A11 radio.
  4. If all circuits test normal, replace the T3 amplifier.
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