Im planning to connect my carpc to my Mercedes-Benz head unit. This head unit is made by grindig, so it uses grundig CD-box protocol. Does anybody knows how can i activate this input ? It does not work as input when CD-Box is not connected to the head unit, but is it somehow possible to cheat head unit like it is with sony unilink (http://gnunilink.sourceforge.net/). Have you seen devices like that for grundig ?