XHP stage 3 possible problem ?

Subwoofer

Sergeant
Jan 9, 2020
267
48
0
Ride
335i
So now this is an important update. None of the steering wheel buttons work, the up shift on paddles don’t work, there is no lights on the buttons at night and when I put the stick across In sport there is no light on...

I think I need a new wiring harness, any ideas ?