To be honest, I don't really know how the trailer connection was made as the tow bar was already on the car when I bought it.

All lights on the car are working correctly.

Given everything else on the car, I suspect it may have been connected directly, especially if it is an aftermarket tow bar and not genuine BMW!

I don't even know if the lights of the trailer are faulty or if the car wiring is faulty!

A curious thing though - I don't get any error message about the indicators, but they were also not working on the trailer.

Any way of telling without dismantling the whole rear end?



Any easy re-set method I can try first?