Can the DCM use WiFi or is it cellular only?
I'm in a cellular dead zone so wondering if I connect to my home WiFi will allow the DCM to send its spy data on me successfully, possibly helping the 12v drain. It occurs to me that it might only transmit over cellular, which would doom that experiment.
The only downside would be wireless CarPlay not connecting when I enter the vehicle but I'm happy to just plug my phone into USB-C.