Cannot get comms with any controller, this has sat nav fitted, it has not been removed, and yes I can control heater settings, wipers, indicators, lights, windows , central locking, all OK I was thinking it was a supply or earthing problem, as when I have had issues with can systems, I have been able to get comms with some of the systems. Autodiagnos and Enginuity both report no comms is ignition on etc.