The lights are monitored and actuated by the vehicle's SAM, it's not, strictly speaking, a CANbus function.I would agree reversing lights are unlikely to be linked to Adaptive Brakes ... what I meant was I suspect having ILS and Adaptive Braking lights means its likely the whole lighting system is quite advanced i.e. its not a simple on off switch delivering enough amps to light a 5W bulb.
OK it might not throw the usual Canbus broken bulb messgae, but it sure is doing other things, not normally associated with a simple boot light!
Boot light would have a pretty simple ON/OFF on contact, and OFF on timer algorithm, all handled by the SAM.