1.Mercedes-Benz, BMW (automatic), Audi models to install the reverse camera wiring method is the same, no matter where you buy the camera, the camera power supply should be connected to the Android power line out of the "CMA 12V", can not be connected to the reversing lights.
Please see the picture below:
2.As BMW manual cars are special, the "CAMERA DETECT" wire on the RCA cable needs to be connected to the reverse light, and the wiring elsewhere is the same as the automatic.
Please see the picture below:
Note: If the wiring method is correct, but the reverse screen does not switch when reversing, you will need to check the machine settings and fiber optics.