Interface Operation; By Factory Touch Screen - Car-Interface.com CI-RL4-PCM50 Manual

3. Interface operation

3.1.

By factory touch screen

To switch the interface's activated video sources, the factory touch screen can be used.
Long press the left top corner of the factory touch screen to switch the video-source.
Long pressing the left top corner of the factory touch screen switches the input from the
factory video to the inserted video sources. If all inputs are activated by dip switch settings,
the order is the following:
  
Factory video Video IN 1 Video IN 2 factory video
Each press will switch to the next enabled input. Inputs which are not enabled will be
skipped.
Switchover by factory touch screen isn't possible in all vehicles. In some vehicles the
external keypad has to be used.
Version 17.03.2020 HW: CAM(V98)/UP(V20) CI-RL4-PCM50