Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hi there. I am Cam.I think you are on the right track with the unit itself. The system does not use a different input for ignition, rather it uses network messages to operate. When it fails, this and many other issues can be the result. You do need to replace the head unit and have it unlocked/programmed at the dealership. AS for compatibility, that you need to ask a dealer who has access to the required part number to answer. I do not have that information available.