Pinpoint Test Ad : The TCU (TELEMATIC Control Unit Module) Does Not Respond To The Diagnostic Scan Tool: Notes
WARNING: This page is about a different car, the 2015 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
The Telematics Control Unit (TCU) Does Not Respond To The Diagnostic Scan Tool
Refer to Wiring Diagrams MODULE COMMUNICATIONS NETWORK for schematic and connector information.
Refer to Wiring Diagrams AUDIO SYSTEM/NAVIGATION - WITHOUT THX for schematic and connector information.
Refer to Wiring Diagrams AUDIO SYSTEM/NAVIGATION - WITH THX for schematic and connector information.
Normal Operation and Fault Conditions
The TCU communicates on the HS-CAN3 and communicates with the diagnostic scan tool through the HS-CAN2. Diagnostic messages are sent/received through the HS-CAN2 circuits at the DLC, and translated through the GWM to the HS-CAN3.
Visual Inspection and Diagnostic Pre-checks
Verify BCM fuse 17 (5A) is OK.