JeremyW wrote:It's likely the CAR CAN bus has been removed from the OBD connector, and replaced with a new "diagnostic bus" that talks just to the VCM, which can relay the message onto the requested module by decoding the query address and sending it onward to the appropriate bus where the module is located.
That's basically what's done on most all vehicles since 2005, i.e. using a single CAN bus with a central gateway (CG) that communicates
with the multiple buses (high speed engine/ABS & low speed single-ended comfort control) to access the various vehicle ECUs. Typically the
CG also controls which ECUs are active in the network, e.g. what comfort features the vehicle has installed.