Network Message Chart
WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
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: Communications Network - System Operation And Component Description .
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 Diagnostic Trouble Codes (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 Button State | Fcdim | The Fcdim Sends This Message To Indicate When A Button Is Pressed On The Fcim So The Audio System Can Make The Desired Setting Change. |
| Audio Display Request Mode | Fcdim | Used To Request A Display Mode From The Acm. |
| Audio Mute | Ipc | Used To Mute The Audio System So A Warning Notification From The Ipc Can Be Heard. |
| Belt-Minder® Mode | Ipc | When A Mykey® Is In Use, The Audio System Is Muted Until The Safety Belts Are Buckled. |
| Bezel Test Request | Fcdim | Used To Request The Bezel Test For The Audio System. |
| Chime Request | Ipc | Used To Mute The Audio System So A Chime From The Ipc Can Be Heard. |
| Display Set Volume Request | Fcdim | A Request For The Acm Set Volume To Be Displayed On The Fcdim. |
| Ignition Status | Bcm | Off, Accessory, Run, And Start Ignition States Required For Acm Operating Modes And Fault Reporting. |
| Mykey® Volume Limit Mode | Ipc | When A Mykey® Is In Use, Maximum Volume Of The Audio System Is Limited. |
| Steering Wheel Switch Data | Fcdim | Used For The Rh Steering Wheel Switch Input Signal To Operate The Volume +/- And Seek +/-. |
| Vehicle Configuration/Information | Ipc | Used For Vehicle Configuration Information To The Acm. |
| Vehicle Speed | Pcm | Used For The Speed Compensated Volume Function. |
Module Network Input Messages - Apim
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Acm Configuration | Acm | Used To Verify The Correct Configuration And Modules Are Installed. |
| Airbag Deployment Ecall Notification | Rcm | Used To Indicate That Air Bag Deployment Has Occurred. |
| Airbag Deployment Status | Rcm | Used To Monitor Air Bag Deployment Status For 911 Assist. |
| Ecall Notification | Rcm | Used To Notify Of A 911 Assist Call Being Initiated Due To Air Bag Deployment. |
| Gps Data | Gpsm | Used For Vehicle Positioning, Heading, And Direction For Navigation And 911 Assist. |
| Ignition Status | Bcm | Off, Accessory, Run, And Start Ignition States Required For The Apim Operating Modes And Fault Reporting. |
| Selector Lever (Prndl) Status | Bcm | Used To Verify The Gear Lever Position For Vehicle Direction Data For Navigation. |
| Steering Wheel Switch Data | Fcdim | Used For The Rh Steering Wheel Switch Input Signal To Operate Sync® Functions. |
| Vehicle Configuration Data | Bcm | Used To Verify Vehicle Configuration Data Such As Vin And System Module Configuration. |
| Vehicle Speed | Pcm | Used For Navigation Functionality. |
Module Network Input Messages - Fcdim
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Acm Cd Data | Acm | Used To Display Cd Data On The Fcdim. |
| Acm Configuration | Acm | Used To Verify The Correct Configuration And Modules Are Installed. |
| Acm Radio Functions | Acm | Used To Display The Acm Radio Functions Such As Seek, Tune And Am/ Fm Stations On The Fcdim. |
| Acm Volume And Mode Status | Acm | Used To Display Audio Volume And Mode Status. |
| Cd Load/Eject | Acm | Used To Display The Loaded Or Ejected Cd Status On The Fcdim. |
| Day/Night Status | Bcm | Used For Day/Night Illumination Status For The Fcim. |
| Ignition Status | Bcm | Off, Accessory, Run, And Start Ignition States Required For Fcim Operating Modes And Fault Reporting. |
| Illumination Dimming Level | Bcm | Controls The Backlight Intensity, Based On The Input From The Dimmer Switch. |
| Satellite Radio Status | Acm | Used To Display The Satellite Radio Modes And Functions. |
Module Network Input Messages - Gpsm
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Ignition Status | Bcm | Off, Accessory, Run, And Start Ignition States Required For Gpsm Operating Modes And Fault Reporting. |
| Navigation Wheel Rotation Count And Direction | Bcm | Used To Provide More Accurate Tracking Of The Vehicle Position When The Gps Signal Is Temporarily Unavailable. |
| Selector Lever (Prndl) Status | Bcm | Used To Verify The Selector Lever Status For Navigation. |
| Vehicle Yaw Rate | Rcm | Used To Verify The Vehicle Acceleration Data For Navigation. |
Module Network Input Messages - Ipc
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Acm Configuration | Acm | Used To Verify The Correct Configuration And Modules Are Installed. |
| Acm Status | Acm | Used For The Mykey® Status To Limit Volume In Belt-Minder® Mode. |