Network Message Chart
WARNING: This page is about a different car, the 2016 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 |
|---|---|---|
| Accessory delay status | BCM | Used to allow the operation of the ACM after they ignition has been turned off, before a front door is opened. |
| Beltminder warning status | IPC | Used to mute speaker output so the Belt-Minder ® tone can be more easily heard. |
| 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. |
| 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. |
| Steering wheel switch multimedia commands | SCCM | On vehicles equipped with SYNC ®, used to control the audio system from the RH steering wheel switches. |
| Steering wheel switch volume command | SCCM | On vehicles equipped with SYNC ®, used to set the audio system volume from the RH steering wheel switches. |
| Vehicle speed | IPC | Used to support the speed compensated volume feature. |
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. |
| 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. |