Circuit/System Testing
IMPORTANT:
Noise compensated volume only available on vehicles equipped with Y91 or UQS.
- Turn the ignition ON. Disconnect the noise compensation microphone.
- Measure for 7-9 volts between the noise compensation microphone supply circuit terminal A and the drain circuit terminal B.
- If the voltage is less than the specified range, test the circuits for a short to ground, or an open/high resistance. If the circuit tests normal, replace the auido amplifier.
- If the voltage is greater than the specified range, test the circuits for a short to voltage. If the circuit tests normal, replace the audio amplifier.
- If all circuits test normal, replace the noise compensation microphone.