Switching The Video Sources; By Infotainment Buttons - r.LiNK 27-590 Manual

3. Switching the video sources

By infotainment button
3.1.
Switching the video sources can be done by pressing the vehicle's „Call-off" button.
Each press will switch to the next enabled input. If all inputs are enabled the order is:
Factory video video IN1 video IN2 factory video ...
   
Disabled inputs will be skipped.
Switchover by vehicle buttons isn't possible in all vehicles. In some vehicles the external
keypad has to be used.