Module Network Input Messages - RCM

Module Network Input Messages - RCM

Accessory Delay Feature

The accessory delay feature is a BCM-controlled software function that allows the audio system to be operated for a preset period of time after the ignition is turned off and a front door has not been opened.

AM/ FM Radio

The AM/ FM on-glass antenna grid (coupe) or fender-mounted antenna (convertible) receives analog radio waves and sends them through the AM/ FM antenna amplifier (coupe) and AM/ FM antenna coaxial cable to the ACM. The radio waves are converted into fluctuating AC voltage and sent as left and right analog audio signals to the audio DSP module. For vehicles without Shaker, the audio DSP module processes the audio signals and sends them to the speakers as fluctuating AC voltage. For vehicles with Shaker, the audio DSP module processes the audio signals and sends them to the speakers and subwoofer amplifier as fluctuating AC voltage. The subwoofer amplifier processes the audio signals and sends them to the subwoofer speaker as fluctuating AC voltage.

ANC - 2.3L

ANC is an audio system feature that eliminates a certain range of low frequency engine noise within the passenger compartment typically induced under wide open throttle or heavy part-throttle conditions. The system uses two (coupe) or three (convertible) microphones, a DACMC (contained within the ACM), and the audio system speakers. The DACMC determines the noise frequency to be canceled based upon engine rotation speed data, engine torque data, and accelerator pedal position data from the PCM, as well as microphone input signals.

While the engine is running, the ANC microphones located in the overhead console and center rear of the headliner (coupe), or overhead console, RHR quarter panel, and LHR quarter panel (convertible) monitor the engine noise resonating in the passenger compartment. The microphones transmit this noise as analog signals to the DACMC (contained within the ACM), where they are converted into digital signals by the integrated analog/digital converter. The digital signals are processed and an inverted phase sound wave with the same amplitude as the original sound is created. This new sound is converted into an analog audio signal, transmitted to the DACMC internal tone generator, and output by the ACM to the audio DSP module as fluctuating AC voltage. The audio DSP module sends the signal to the LHF and RHF door woofer speakers, and right and left parcel shelf full-range (without Shaker) or coaxial (with Shaker) speakers (coupe) or RHR and LHR quarter panel full-range (without Shaker) or coaxial (with Shaker) speakers (convertible) as fluctuating AC voltage.

APIM Programming

The APIM requires specific programming procedures for correct operation when it is replaced, when upgrades are available and requested, or when directed by a TSB, FSA, SSM, or Electronic Field Communication (EFC) to resolve SYNC® performance concerns. For more information, Refer to: SYNC Module [APIM] Programming (415-00B Information and Entertainment System - General Information - Vehicles With: Touchscreen Display, General Procedures).

Audio Extended Play

This software feature allows the audio system to operate with the ignition OFF, regardless of door latch position.