Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2021EXPLORER XLT, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 52 (MODULE COMMUNICATIONS NETWORK)
2021 Ford Explorer XLT, RWD
Section 52 (Module Communications Network)
2021 Ford Explorer XLT, RWDSECTION Section 52 (Module Communications Network)
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
- Description And Operation
- Communications Network - Overview
- Communications Network - System Operation and Component Description
- System Operation
- System Diagram
- Network Termination
- Gateway Module
- High Speed Controller Area Network 1 and 2 (HS-CAN1, HS-CAN2)
- High Speed Controller Area Network 3 (HS-CAN3)
- Medium Speed Controller Area Network (MS-CAN, MS-CAN2)
- Controller Area Network (CAN) Fault Tolerance
- Controller Area Network (CAN) Multiplex Messages
- System Operation
- Diagnosis And Testing
- Communications Network
- DTC Chart: Gateway Module (GWM)
- Symptom Chart: Communication Network
- Pinpoint Tests
- Pinpoint Test A : The Powertrain Control Module (Pcm) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test B : The TCM (Transmission Control Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test C : The Anti-Lock Brake System (Abs) Module Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test D : The Restraints Control Module (RCM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test E : The BECMB (Extended Power Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test F : The SCCM (Steering Column Control Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test G : The SASM (Steering Angle Sensor Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test H : The Instrument Panel Cluster (IPC) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test I : The Body Control Module (BCM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test J : The BCMB (Body Control Module B) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test K : The FCIM (Front Controls Interface Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test L : The Audio Front Control Module (ACM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test M : The Image Processing Module A (IPMA) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test N : The Image Processing Module B (IPMB) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test O : The Global Positioning System Module (GPSM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test P : The FCDIM (Front Control/Display Interface Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Q : The Accessory Protocol Interface Module (APIM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test R : The DSP (Audio Digital Signal Processing Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test S : The RTM (Radio Transceiver Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test T : The Driver Seat Module (DSM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test U : The Driver Door Module (DDM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test V : The Passenger Door Module (PDM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test W : The Side Obstacle Detection Control Module LH (Sod-L) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test X : The Side Obstacle Detection Control Module RH (Sod-R) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Y : The Cruise Control Module (CCM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Z : The Head Up Display (HUD) Module Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Aa : The HSWM (Heated Steering Wheel Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Ab : The SCME (Front Seat Climate Control Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Ac : The SCMG (Driver Multi-Contour Seat Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Ad : The SCMH (Passenger Multi-Contour Seat Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test AE : The TRM (Trailer Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test AF : The TBM (Trailer Brake Control Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Ag : The RBM (Running Board Control Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Ah : The TCCM (Transfer Case Control Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Ai : The GFM (Generic Function Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test AJ : The GFM2 (Generic Function Module 2) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test AK : The Gateway Module (GWM) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Al : No High Speed Controller Area Network 1 (HS-Can1) Communication, All Modules Are Not Responding
- Pinpoint Test Am : No High Speed Controller Area Network 2 (HS-Can2) Communication, All Modules Are Not Responding
- Pinpoint Test An : No High Speed Controller Area Network 3 (HS-Can3) Communication, All Modules Are Not Responding
- Pinpoint Test AO : No Medium Speed Controller Area Network (Ms-Can) Communication, All Modules Are Not Responding
- Pinpoint Test AP : No Medium Speed Controller Area Network 2 (Ms-Can2) Communication, All Modules Are Not Responding
- Pinpoint Test AQ : No Power To The Data Link Connector (DLC)
- Communications Network
- General Procedures
- Removal And Installation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.