Theory Of Operation

The Amplifier (AMP) may have an internal Active Noise Cancellation Module (ANC) if equipped with Sales Code JLW.

The Amplifier performs the creation of sound waves from the vehicle's speakers to cancel engine related noises from the passenger compartment. The module creates these sound waves in proportion to engine RPM and inputs from the interior microphones. The ANC module receives engine RPM signals from a direct hard wired engine RPM signal circuit from the PCM. The Radio has audio signal circuits coming from the radio to the Amplifier and then the Amplifier converts the signals to amplified signals to the individual speakers. The ANC module uses 4 microphones located in the headliner for ANC inputs to listen for engine noises in the interior compartment. The Amplifier controls and monitors the speaker output circuits for a concern when the ignition is cycled on.

The speakers are manufactured from different components, depending on the level of the audio system. Make sure any serviced speakers are similar to the one being removed. When the vehicle is identified and configured for use with a separate Amplifier, the Radio audio circuits feed into the Amplifier as audio inputs.

For additional information regarding the description and operation of the Audio System. Refer to DESCRIPTION AND OPERATION .