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Symptom Chart: Communication Network

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.

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to Diagnostic Methods for information regarding Ford-specific diagnostic practices.

Condition Possible Sources Actions
The vehicle does not start with the diagnostic scan tool connected to the Data Link Connector (DLC) and/or multiple malfunction indicators are only on when the diagnostic scan tool is connected to the DLC Refer to the Pinpoint Test GO to Pinpoint Test AI .
The Powertrain Control Module (PCM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test A .
The Anti-Lock Brake System (ABS) module does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test B .
The Restraints Control Module (RCM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test C .
The Steering Column Control Module (SCCM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test D .
The Instrument Panel Cluster (IPC) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test E .
The Body Control Module (BCM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test F .
The Heating Ventilation Air Conditioning (HVAC) module does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test G .
The Rear Heating Ventilation Air Conditioning (RHVAC) module does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test H .
The Front Control/Display Interface Module (FCDIM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test I .
The Front Controls Interface Module (FCIM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test J .
The Audio Front Control Module (ACM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test K .
The Audio RCU does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test L .
The audio Digital Signal Processing (DSP) module does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test M .
The Headlamp Control Module (HCM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test N .
The LTM does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test O .
The Driver Seat Module (DSM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test P .
The Front Seat Climate Control Module (SCME) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test Q .
The Global Positioning System Module (GPSM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test R .
The Accessory Protocol Interface Module (APIM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test S .
The Parking Aid Module (PAM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test T .
The Side Obstacle Detection Control Module - Left (SOD-L) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test U .
The Side Obstacle Detection Control Module - Right (SOD-R) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test V .
The Radio Transceiver Module (RTM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test W .
The Remote Function Actuator (RFA) module does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test X .
The Power Steering Control Module (PSCM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test Y .
The Transfer Case Control Module (TCCM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test Z .
The Trailer Brake Control (TBC) module does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test AA .
The Power Running Board (PRB) module does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test AB .
The Trailer Module (TRM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test AC .
The Vehicle Dynamics Module (VDM) does not respond to the diagnostic scan tool Refer to the Pinpoint Test GO to Pinpoint Test AD .
The Rear Fog Lamp Control Module (RFLM) does not respond to the diagnostic scan tool (China only) Refer to the Pinpoint Test GO to Pinpoint Test AE .
No HS-CAN communication, all modules are not responding Refer to the Pinpoint Test GO to Pinpoint Test AF .
No MS-CAN communication, all modules are not responding Refer to the Pinpoint Test GO to Pinpoint Test AG .
No I-CAN communication, all modules are not responding Refer to the Pinpoint Test If the IPC does not pass a network test, DIAGNOSE IPC first. GO to Pinpoint Test E .
GO to Pinpoint Test AH .
No power to the DLC Refer to the Pinpoint Test GO to Pinpoint Test AI .
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