This is a disclaimer, do this at your own risk, if you don’t want to short any wires then disconnect battery leads.
This is a short tutorial on how to retrofit a mute button to your bmw parking sensor audio output, note if you have a reverse camera it will just be plug and play, if you don’t have a reverse camera then you’ll need to add this cable / wire from pin 1 to 28.
This only took me an hour, but could have been completed quicker if I’d removed rear vent and ducting from the beginning.
Good luck!
