AM/ FM Antenna Amplifier - Coupe

The ACM can be operated with the ignition in RUN, ACC, or OFF.

The ACM receives radio waves containing audio from the antenna coaxial cables and converts them into fluctuating AC voltage. The ACM receives stereo and mono audio signals from the APIM in the form of fluctuating AC voltage. The ACM processes all inputs, and depending on the input received, sends stereo or mono 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.

The ACM receives radio waves containing satellite radio and HD Radio® (with Shaker) data through the antenna coaxial cables. The data is sent to be displayed on the FDIM.

The ACM contains the CD player.

The ACM sends data to the APIM through the SDL circuits for the SIRIUS Travel Link features for vehicles with navigation.

The ACM contains the DACMC for vehicles with the 2.3L or 5.2L.

The ACM and DACMC require separate PMI procedures when the ACM is replaced.

AM/ FM Antenna Amplifier - Coupe

The AM/ FM antenna amplifier receives AM/ FM radio waves from the on-glass antenna grid. The AM/ FM antenna amplifier is powered by the ACM and amplifies AM audio signals to improve reception. The AM/ FM radio waves are sent through the AM/ FM antenna coaxial cable to the ACM.

ANC Microphones - 2.3L

For a coupe, two ANC microphones (overhead console-mounted and center rear headliner-mounted) measure the amplitude and phase of the engine noise inside the passenger compartment. For a convertible, three ANC microphones (overhead console-mounted, RHR quarter panel, and LHR quarter panel) measure the amplitude and phase of the engine noise inside the passenger compartment. The monitored sounds are converted into analog signals by the microphones and sent to the DACMC (contained within the ACM).

Antenna

The AM/ FM radio uses the on-glass (coupe) AM/ FM antenna grid or RHR fender-mounted (convertible) AM/ FM antenna to receive analog radio waves. The radio waves are sent through the AM/ FM antenna amplifier (coupe) or amplifier integrated into the antenna base (convertible) and AM/ FM antenna coaxial cable to the ACM. The ACM transmits these radio waves to the audio DSP module where they are further amplified.

To compensate for AM signal strength loss as the radio waves are transmitted from the antenna to the ACM, battery voltage is applied to the antenna amplifier (coupe) or amplifier integrated into the antenna base (convertible) to boost the AM radio signal. This allows the AM radio waves entering the ACM to be approximately the same strength as they were before amplification at the antenna.

For vehicles with Shaker, the HD Radio® uses the on-glass (coupe) AM/ FM antenna grid or RHR fender-mounted (convertible) AM/ FM antenna to receive radio waves containing digital audio and data. The radio waves are sent to the AM/ FM antenna amplifier (coupe) or amplifier integrated into the antenna base (convertible) where the radio waves containing digital audio are amplified to improve reception. The amplified radio waves containing audio and the radio waves containing data are sent through the AM/ FM antenna coaxial cable to the HD Radio® receiver built into the ACM. The ACM transmits these radio waves to the audio DSP module where the radio waves containing digital audio are further amplified, and the radio waves containing data are sent to be displayed on the FDIM.

The satellite radio uses the roof-mounted (coupe) or luggage compartment lid-mounted (convertible) satellite radio/GPS antenna to receive signals containing digital audio and data. These signals are sent through the satellite radio/ GPS coaxial cable, satellite radio/ GPS splitter, and satellite radio antenna coaxial cable to the satellite radio receiver built into the ACM.

The roof-mounted (coupe) or luggage compartment lid-mounted (convertible) satellite radio/GPS antenna contains a GPS antenna circuit board that receives radio waves containing GPS data. The data is sent through the satellite radio/ GPS coaxial cable, satellite radio/ GPS splitter, and GPS coaxial cable to the APIM.