That why I’m wondering why somebody messing with mirrors caused a problem. The indicators for Blind Spot are in the mirrors so I’m pretty sure they are tied into the system.
The blind spot sensor error would come from the radar units at the back corners.
Hard to say more without additional info.
The mirror leds are driven from the corresponding radar unit at the back corner.
Possible that if something happened to the leds or wiring, it may mess up the radar functionality, but they usually engineer protection in for shorts and opens. Perhaps that's the source of the error
The mirror leds are driven from the corresponding radar unit at the back corner.
This is the schematic from my old Venue. Probably the modules are same or similar enough to use for reference.