Network Communication

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. 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
Audio DSP module (Sony® sound)
Audio DSP module (THX® sound)
FCIM
FDIM (vehicles without navigation)
APIM
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 FDIM display
Dialing phone numbers from the FCIM (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	Transmitting Module	Receiving Module(s)	Audio System Function
Accelerometer and Yaw Sensor Data	Instrument Panel Cluster (IPC)	GPSM	Provides vehicle yaw rate to the GPSM for use in vehicle tracking.
Accessory Delay Status	SJB	ACM APIM FCIM FDIM	When active, this signal allows the audio component to be operated after the vehicle is shut off.
Average Fuel Economy Data	IPC	ACM	Provides average fuel economy data to the ACM.
Belt-Minder® Status	IPC	ACM	When this signal is active, the speaker output is reduced to allow the Belt-Minder® tone to be more easily heard. This message only applies to vehicles with MyKey that have this feature currently enabled.
Climate Control Data (Hybrid only)	HVAC module	ACM	Provides the outside air temperature to the ACM.
Compass Display Status	IPC	FDIM	Indicates the compass heading or mode (calibration, zone). This message only applies to vehicles without navigation.
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	IPC	ACM	Indicates whether English or metric units is currently selected.
FCIM Button Press Data	FCIM	ACM APIM Audio DSP module IPC	Indicates when a button is pressed on the FCIM so the audio system can make the desired setting change.
Fuel Level (Instant)	IPC	APIM	Provides the instant fuel level to the APIM.
Historical Fuel Economy (Hybrid only)	IPC	ACM	Provides the historical fuel economy data to the ACM for display on the FDIM. This message only applies to vehicles with navigation.
HVAC Button Status (from ACM)	ACM	HVAC module	Indicates when a climate control setting is changed using the FDIM touchscreen (which is hardwired to the ACM) so the HVAC module can make the desired setting changes. This message only applies to vehicles with navigation.
HVAC Button Status (from FCIM)	FCIM	HVAC module	Indicates when a climate control button is pressed on the FCIM so the HVAC module can make the desired setting change.
HVAC Indicator Status (to ACM)	HVAC module	ACM	Indicates the mode of the HVAC module so the ACM can send the correct display information to the FDIM. This message only applies to vehicles with navigation.
HVAC Indicator Status (to FCIM)	HVAC module	FCIM	Indicates the mode of the HVAC module so the FCIM can illuminate the appropriate indicator on the bezel face.
HVAC Module Display Data	HVAC module	ACM (with navigation) FDIM (without navigation)	Indicates certain climate control settings such as temperature, fan speed, air distribution, and outside air temperature.
HVAC Voice Request	ACM	HVAC module	Provides climate control setting changes that are initiated through the voice recognition system. This message only applies to vehicles with navigation.
Ignition Switch Position	SJB	ACM APIM Audio DSP module FCIM FDIM GPSM	Indicates the ignition position to the audio system modules in order to control power management.
Instrument Illumination Level	SJB	ACM FCIM FDIM	Controls the backlight intensity, based on the position of the dimmer switch.
Navigation Rolling Wheel Count	IPC	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.
Park Brake Status	SJB	ACM	Provides the park brake status to the ACM.
Parking Aid Sounder Volume Cutback Request	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.
Power Flow Status (Hybrid only)	IPC	ACM	Provides the approximate power flow data to the ACM for display on the FDIM. This message only applies to vehicles with navigation.
TPMS Status (Hybrid only)	SJB	APIM	Provides the current tire pressure and TPMS warning indicator status to the APIM.
Transmission Selector (PRNDL) Status	IPC	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 a rear view camera, this signal is used by the ACM to determine if it should allow the video feed from the rear view camera to be shown on the FDIM. For vehicles with the SYNC® system but not navigation, this signal is used by the GPSM for more accurate vehicle tracking.
Vehicle Speed	IPC	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.
Vehicle Identification Number (VIN) Information	IPC	ACM APIM	Provides the VIN to verify the correct modules are installed.