Worked on my AVM70, no more audio cutout with turn signals. Luckily the USB port is on the front so didn't have to remove the unit. Only annoying thing is that after the turn signal is cancelled and the screen returns from the side-view camera display, the unit resets the audio balance/fade to original. So if you have the audio only playing to rear (the speakers in the living area in my case) it's plaing on the E450 doors (front) and the rear (living area).