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I don't know how much he's posting in this forum lately, but the guy with the most info on this subject is Rambunctious. Rob's a "Chief Engineer, New Product Strategy and Business Development" for the overhead systems at Johnson Controls Interiors (who make these things for Ford).
I'm not sure exactlly what info you want but here is the info i have
The CAN has an unshielded twisted pair cable, data bus plus, circuit 1827 (WH/L) and data bus minus, circuit 1828 (PK/LG).
The CAN permits inter-module communication between the DLC, PCM, instrument cluster and the ABS module. When the diagnostic tool communicates to modules on the CAN, the diagnostic tool must request all information or initiate module commands Hope this helps.
In older vehicles the communication protocol based on J1850 standart was used.
Do you know if the CAN is a J1979 or J1939 protocol (os is this only a typo?)?