Moin, I got into my head to install a CD changer in the middle console in addition to the CD changer in the trunk. Let’s put it that way, just see it as a craft project For me, the question now arises, how I can switch between the two changers back and forth. At Ebay there is a cable with switch, but that should cost 40€. Yes, no, doesn’t have to be. I’ve also made around with a few electronic parts in the last time and in the end I am on d The problem with this thing: it can only switch in one direction. Does anyone know if the communication with the CD changer is bidirectional or do the data/control signals always go in one direction? Say: I assume that the audio signals always go from the CD changer to the radio, otherwise no sense is made.