Tell us about yourself!
So, the small board is the guts of a CDMA cellphone which you disconnected with the header plug, This disabled connectivity with Onstar Central but also eliminated Diagnotics, GPS, Compass and WiFi hotspot. Control and interface with the user Cellphone are unaffected. Maybe I would still have Android Auto, a superior alternative. As you say, no compass on the dash. Please let me know if I've got it right. Thanks.Also, I built a simple and trouble free stop-start defeat for my 2017 Cad XT5 that has worked for better than a year. The soldering put Cad owners off. Can't see that it would be of general interest but I'd post it.