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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the noise compensation microphone.
  2. Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone supply voltage circuit terminal B and ground.
    • If less than the specified range, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the audio amplifier.
    • If greater than the specified range, test the voltage supply circuit for a short to voltage. If the circuit tests normal, replace the audio amplifier.
  3. Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone supply voltage circuit terminal B and the drain wire circuit terminal A.
    • If less than the specified range, test the drain wire circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the audio amplifier.
  4. If all circuits test normal, replace the noise compensation microphone.
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