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Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the T3 amplifier.
  2. Ignition ON, radio ON, mute OFF, test for less than 1 V between the amplifier control circuit terminal 37 and ground.
    • 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 ON, test for 7.5-8.5 V between the amplifier control circuit terminal 37 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.
  4. If all circuits test normal, replace the T3 amplifier.
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