The telematics are on a layer above J1939. If you think of J1939 like HTTP/REST (and standard response formatting), then the telematics would be a client on the

The telematics are on a layer above J1939. If you think of J1939 like HTTP/REST (and standard response formatting), then the telematics would be a client on the vehicle. You could find the telematics control unit and unplug it, I suppose. Many fleet owners buy vehicles without default optioned telematics and pick their own. I don't think the argument is the invasion of privacy with telematics, but rather, that mechanic shops would like to access the vehicle data for diagnostics, which they can do if it is according to a standard.