Network Message Chart
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
A missing network message is indicated by a U-code DTC. When a missing message DTC (U-code) sets, it is important to look for symptoms present in the audio system and throughout the vehicle, and to review the complete message list to determine which other modules rely on the same message. Refer to CAN Module Communication Message Chart in
Module Communications Network
. When the other modules have been identified, run the self-test for those modules. If the same message is missing from those modules, the identical, or similar lost communication DTCs may be set in those modules. Confirmation of missing messages common to multiple modules can indicate that the originating module is the source of the concern, or that the communication network may be at fault.
It is very important to understand the following:
- Where the input originates
- All of the information necessary for a feature to operate
- Which module(s) receive(s) the input or command message
- Which module controls the output of the feature
- If the module that receives the input controls the output of the feature, or whether it outputs a message over the CAN to another module.
Module Network Input Messages - ACM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Audio settings | IPC | Used to confirm the audio system data shown in the IPC |
| Beltminder warning status | RCM | Used to mute speaker output so the Belt-Minder ® tone can be more easily heard. The speaker output is muted until the safety belt(s) are buckled. This message only applies to vehicles with a MyKey ® that is enabled and in use. |
| Car mode | BCM | Used to disable certain audio system features when the vehicle is in transport or factory mode. |
| Day/night status | BCM | Used to adjust the AM radio reception sensitivity. |
| FCIM set volume | FCIM | Used to set the audio system volume from the FCIM. |
| Ignition status | BCM | Used to indicate the ignition state (OFF, ACCESSORY, RUN and START) required to support the audio system operating modes and fault reporting. |
| MyKey volume limit | IPC | Used to limit the maximum audio system volume when a MyKey ® restricted key is in use. |
| Steering wheel switch multimedia commands | SCCM | Used to control the audio system from the RH steering wheel switches. |
| Steering wheel switch volume command | SCCM | Used to set the audio system volume from the RH steering wheel switches. |
| Vehicle speed | PCM | Used to support the speed compensated volume feature. |
| Rear audio commands | Audio RCU module | Used to set the audio system volume, select media and utilize the seek +/- function from the rear seat audio controls. |
Module Network Input Messages - Audio RCU Module
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Ignition status | BCM | Used to indicate the ignition state (OFF, ACCESSORY, RUN and START) required to support the audio system operating modes and fault reporting. |
| ACM information and status | ACM | Used to display the current audio system media selection at the rear seat audio controls. |
Module Network Input Messages - APIM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Airbag deployment status | RCM | Used to monitor airbag deployment status for 911 assist. |
| Audio source | ACM | Used to monitor the current audio system media source selection. |
| Car mode | BCM | Used to disable certain audio system features when the vehicle is in transport or factory mode. |
| FCIM button press data | FCIM | Used to control the APIM media sources and interact with connected devices from the FCIM. |
| Ignition key type | BCM | Used to determine if a MyKey ® is enabled and in use. |
| Ignition status | BCM | Used to indicate the ignition state (OFF, ACCESSORY, RUN, and START) required for APIM operating modes and fault reporting. |
| Steering wheel switch multimedia commands | SCCM | Used to control the audio system from the RH steering wheel switches. |
Module Network Input Messages - FCDIM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| ACM signals | ACM | Used to display the ACM radio functions such as seek, tune and AM/FM stations on the FCDIM. |
| Audio source | ACM | Used to display the selected audio source on the FCDIM. |
| Car mode | BCM | Used to disable certain audio system features when the vehicle is in transport or factory mode. |
| CD status | ACM | Used to display CD information on the FCDIM |
| CD load/eject | ACM | Used to display the loaded or ejected CD status on the FCDIM. |
| Gear lever position | BCM | Used to verify the gear selector position for bezel diagnostics. |
| GPS compass direction | GPSM | Used to display the current vehicle compass heading on the FCDIM |
| Ignition status | BCM | Used to indicate the ignition state (OFF, ACCESSORY, RUN, and START) required for FCDIM operating modes and fault reporting. |
| Illumination dimming level | IPC | Used to control the backlight intensity of the FCDIM based on the dimmer switch input. |
| Language selection | IPC | Used to display information on the FCDIM in the selected language. |
| Voice recognition status | APIM | Used to display the voice recognition status in the FCDIM. |
Module Network Input Messages - FCIM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Climate control settings | HVAC module | Used to indicate the current climate control settings using the FCIM climate control button LEDs. |
| Ignition status | BCM | Used to indicate the ignition state (OFF, ACCESSORY, RUN, and START) required for FCIM operating modes and fault reporting. |
| Car mode | BCM | Used to disable certain audio system features when the vehicle is in transport or factory mode. |
Module Network Input Messages - GPSM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Ignition status | BCM | Used to indicate the ignition state (OFF, ACCESSORY, RUN, and START) required for GPSM operating modes and fault reporting. |
| Selector lever (PRNDL) status | BCM | Used to verify the gear lever position for vehicle direction data. |