Thank you so much.
I would ask you an other thing. You have an Kufatec Multimedia Interface Plus witch Rear view Cam, right? Douse your A4 switche the Video Signal via Can Message? In my car the switch over from Viedeo imput to Rear View Cam dousn´t work. I beleave my car will not send the “drive backwards” Signal via Can Message to Multimediainterface.