Compass

The IPC sends the processed requests over the CAN to the ACM. The ACM outputs the left and right analog chime tones to the audio DSP module over dedicated chimes circuits as fluctuating AC voltage. The audio DSP module outputs the chime tones to the appropriate audio system speakers as fluctuating AC voltage.

For more information, Refer to: Warning Chimes - Overview (413-01 Instrumentation, Message Center and Warning Chimes, Description and Operation). For even more information, Refer to: Warning Chimes - System Operation and Component Description (413-01 Instrumentation, Message Center and Warning Chimes, Description and Operation).

Compass

The GPS antenna integral to the satellite radio antenna is used to acquire the compass heading. The compass heading is sent through the satellite radio/ GPS coaxial cable, satellite radio/ GPS splitter, and GPS coaxial cable to the APIM. The APIM uses this data in addition to wheel speed and wheel rotation direction CAN messages from the ABS module to calculate and provide accurate vehicle tracking. The APIM processes the data and transmits it though the LVDS (Low Voltage Differential Signaling) cable to be displayed on the FDIM. In the event that the GPS fix or signal is temporarily lost, the APIM will continue to use the CAN messages from the ABS module as well as information from the internal gyroscope and accelerometer to provide accurate vehicle tracking.

DSP

The Shaker audio system (if equipped) provides theater quality sound in the vehicle. Audio signals are sent from the ACM and APIM to the audio DSP module. The audio DSP module processes the audio signals and sends them to the speakers.

The audio DSP module determines the correct audio environment based on the audio signals and network messages it receives from other audio system modules. These messages include information such as fade/balance and speed compensated volume settings.

ESE - 2.3L And 5.2L

ESE is an audio system feature that enhances certain engine tones typically induced under wide open throttle or heavy part-throttle conditions. The system uses a DACMC (contained within the ACM) and the audio system speakers.

The DACMC determines the engine tone to enhance based upon engine rotation speed data, engine torque data, and accelerator pedal position data from the PCM. The data from the PCM is processed and 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 midwoofer (without Shaker) or woofer (with Shaker) speakers and right and left parcel shelf (with 5.2L) speakers as fluctuating AC voltage.

HD Radio® - With Shaker

HD Radio® is a subscription-free service.

HD Radio® technology allows an AM or FM radio station to duplicate their traditional analog channel with a matching digital channel. Some FM radio stations subdivide the digital output signal into multiple channels that are not duplicates of the analog channel. These extra multicast channels vary in availability and are called HD2, HD3 and HD4 channels.

The AM/ FM on-glass antenna grid (coupe) or fender-mounted antenna (convertible) receives radio waves containing metadata (information such as station call letters, artist, album title, song title, and genre) and digital HD Radio® audio. The radio waves are sent through the AM/ FM antenna amplifier (coupe) and AM/ FM antenna coaxial cable to the HD Radio® receiver built into the ACM. The metadata is separated from the audio. The metadata is sent to the APIM to be displayed on the FDIM, and the audio is 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.

For more information, refer to “HD Radio” in the Owner's Literature.

MyKey® Audio Operation