Network Communication
WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
The following audio system modules communicate via the MS-CAN:
- ACM (with and without navigation)
- FCIM
- FDIM (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 APIM (with SYNC®)
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 |
|---|---|---|---|
| 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. |
| AFE (Average Fuel Economy) Data | Instrument Panel Cluster (IPC) | ACM | Provides average fuel economy data to the ACM. This message only applies to vehicles with navigation. |
| Brake Sensor Data | IPC | GPSM | Provides vehicle yaw rate to the GPSM for use in vehicle tracking. |
| Compass Display Data | 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 the 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 the RCM are both configured for the eCall feature. |
| English/Metric Mode | IPC | ACM | Indicates whether English or metric units is currently selected. |
| FCIM Button State | FCIM | ACM APIM IPC | Indicates when a button is pressed on the FCIM so the audio system can make the desired setting change. |
| HVAC System 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 System 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 System Indication Command (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 System Indication Command (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 System Voice Request Status | 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 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 | Used by the ACM (with navigation) to provide more accurate vehicle position tracking when the GPS signal is temporarily unavailable. |
| GPSM | 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. |
| Temperature Display Status | HVAC module | ACM (with navigation) FDIM (without navigation) | Indicates certain climate control settings such as temperature, fan speed, air distribution, and outside air temperature. |
| TPMS Status | 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 vehicles with 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 | Used by the ACM for the speed-compensated volume function. |
| APIM | Used by the APIM to prevent driver distraction by limiting certain SYNC® functions based on vehicle speed. | ||
| GPSM | 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. |