Network Communication

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The following audio system components communicate via the MS-CAN :

ACM
Navigation ACM
SDARS module
Audio DSP module
GPSM

There are numerous messages internal to the audio system. The functions of these messages include (but are not limited to):

Changing the audio source
Changing equalizer settings
Updating the ACM display
Dialing phone numbers from the ACM (if equipped with the SYNC system)

In addition, the following messages are utilized by the audio system in conjunction with systems outside of the audio system:

AUDIO SYSTEM MESSAGE LIST

Message	Transmitting Module	Receiving Module(s)	Audio System Function
Accelerometer and Yaw Sensor Data	Instrument Cluster (IC)	GPSM	Provides vehicle yaw rate to the GPSM for use in vehicle tracking.
Accessory Delay Status	SJB	ACM APIM	When active, this signal allows the audio component to be operated after the vehicle is shut off.
Audio Volume Cutback	Parking Aid Module (PAM)	ACM	When this signal is active, the speaker output is reduced to allow the parking aid tone to be more easily heard.
Average Fuel Economy	IC	ACM	Indicates average fuel economy.
eCall Notification	Restraints Control Module (RCM)	APIM	Provides the eCall status to the APIM . This message is also used to confirm that the APIM and RCM are both configured for the eCall feature.
eCall Status	APIM	RCM	Provides the eCall status to the RCM . This message is also used to confirm that the APIM and RCM are both configured for the eCall feature.
English/Metric Mode	IC	ACM	Indicates whether English or metric units is currently selected.
Ignition Switch Position	SJB	ACM APIM Audio DSP module GPSM	Indicates the ignition position to the audio system modules in order to control power management.
Instrument Illumination Level	SJB	ACM	Controls the backlight intensity, based on the position of the dimmer switch.
Navigation Rolling Wheel Count	IC	ACM GPSM	Used by the ACM to more accurately track vehicle position when the GPS signal is temporarily unavailable. Used by the GPSM for vehicle tracking if the vehicle speed signal is lost.
Odometer Rolling Count	PCM	APIM	Provides the odometer reading to the APIM in order to initiate maintenance interval notifications.
TPMS Pressure Data	SJB	APIM	Provides status on the current tire pressures.
Transmission Selector (PRNDL) Status	IC	ACM GPSM	For the navigation system, this signal is used for more accurate navigation tracking. For the parking aid system, this signal is used by the ACM to determine if it should enable the speaker mute feature when a parking aid tone sounds. For vehicles with the SYNC system but not navigation, this signal is used by the GPSM for more accurate vehicle tracking.
Vehicle Identification Number (VIN) Information	IC	ACM APIM SDARS module	Provides the VIN to verify the correct modules are installed.
Vehicle Speed	IC	ACM Audio DSP module GPSM	Used by the ACM (or audio DSP module) for the speed-compensated volume function. Used by the GPSM for vehicle tracking.