Thanks, I've already seen this. But I'd like to know if others have some solutions, too. I'd like to implement the best (and simplest) solution in my car.

As many cars have a board-computer which interprets the signals of the control stick and gives them to the factory radio it's maybe something similar to a serial interface. But I'm not too sure about that and didn't get some spec's from the manufactorer of my car. So maybe someone's out there which knows a bit more about communication between control-stick and board computer and factory radio...

TeeMcBee
Got my Mk2! # 080000143