System Operation
Information and Entertainment Systems - Base
System Operation
System Diagram
Network Message Chart
Module Network Input Messages - ACM (Audio Control Module)
Module Network Input Messages - FCDIM (Front Control/Display Interface Module)
Module Network Input Messages - IPC (Instrument Panel Cluster)
AM - FM Radio
The roof-mounted antenna receives AM/FM (Amplitude Modulation/Frequency Modulation) radio waves. The audio signals are sent from the roof-mounted antenna, via the AM/FM (Amplitude Modulation/Frequency Modulation) antenna cable to the ACM (Audio Control Module). The ACM (Audio Control Module) converts the radio waves to a fluctuating AC (Alternating Current) output voltage to the system speakers. The ACM (Audio Control Module) powers the AM/FM (Amplitude Modulation/Frequency Modulation) antenna to amplify the AM (Amplitude Modulation) signal.
Speed Compensated Volume
The ACM (Audio Control Module) adjusts the audio system volume based on the VSS (Vehicle Speed Sensor) signal to compensate for speed and wind noise.
When a MyKey(R) is in use and the MyKey(R) radio volume limiter is enabled, the speed compensated volume is disabled.
Audio Input Jack Mode
When a portable MP3 (Moving Pictures Experts Group -1 Audio Layer 3) player is connected, audio from the MP3 (Moving Pictures Experts Group -1 Audio Layer 3) player can be played through the vehicle speakers. When a device is connected through the audio input jack, only the speaker volume can be controlled by the vehicle audio system. All other functions (such as seek, fast forward, pause) must be carried out on the device itself. Audio signals are sent from the audio input jack to the ACM (Audio Control Module). There are no external power or ground circuits to the audio input jack.
Steering Wheel Switch Function
The RH (Right Hand) upper steering wheel switch is a 5-way switch that operates the volume +/-, seek +/- and the audio mode.
Battery Load Shed
The BCM (Body Control Module) uses the battery current sensor to monitor the battery state of charge. The battery current sensor is attached to the battery ground cable. When the engine is off, and the BCM (Body Control Module) determines the battery state of charge is below 40%, 10% of the charge has been drained or 45 minutes have elapsed, a load shed message is sent over the CAN (Controller Area Network). This message turns off the audio system to save the remaining battery charge. Under this condition, SYS OFF TO SAVE BATT is displayed on the centerstack infotainment display to notify the driver that battery protection actions are active.
Engine off load shed occurs when the engine is not running, and the ignition is in the ACC or RUN position. To clear the load shed state, restart the engine.
MyKey(R)
Audio Operation
When a MyKey(R) is in use, the audio system is muted whenever the Belt-Minder(R) is activated until the safety belts are buckled. This is a standard setting and cannot be changed.
The MyKey(R) also has an optional setting that limits the audio system volume. The maximum volume of the audio system is limited to 45%. If there is an attempt to exceed the limited volume, the MyKey(R) VOLUME LIMITED message is displayed in the centerstack infotainment display.