Circuit/System Testing

Note: Noise compensated volume only available on vehicles equipped with Y91.

1. Turn the ignition ON, Disconnect the noise compensation microphone.
2. Measure for 7 V to 9 V between the noise compensation microphone supply circuit and the drain circuit.
   • If the voltage is in between 9 to 7 V, replace the noise compensation microphone

• If the voltage is greater than 9 V or less than 7 V and a open, short to ground, or short to voltage can not be found, replace the radio.