Amundsen reverse camera issue. Need some help

Hi,

yesterday i installed a reverse camera in my 2012MY superb. I wired everything as it should be but i face some problems that i cannot solve.

The screen of my Amundsen+ (RnS315) stays black when i put the car in reverse, it only says "Look? Safe to move". And there is the options button but i cannot click it. It seems to be "frozen". The amundsen knows i am clicking on it because it gives the usual 'beep' but nothing happens then.

The camera is an boot handle camera with RCA plug. I use an interface as converter for the rca to the amundsen pin plugs. I already tested everything with a multimeter and everything should be fine. 

I already found some topics on the web with people who have exactly the same issues but nobody seemed to be able to help.

Maybe here?

greets