The car might be using the display of the HU to show stuff, or allow the HU to display information on a larger/more centrally placed display. Sometimes things like door chimes etc are going through the stereo...

So I hope that by replacing the head unit I am not preventing some relevant info to be shown on the display...

Also, it then seems to me a pretty good install... At this point I am starting to regret I did not have the Bose system installed, which is supposedly even better.

I hope now I can connect the empef to the amp in the car (I assume there's an amp?!).