So I just bought a 2006 MCS and it has nav and the HK stereo. I just installed a aux input which was taken from a 2008 model it has three wires a yellow black and clear. I saw a post on which pins to connect them to and to move my nav voice to the same connection and it worked... PROBLEM... I am only getting the vocals from the passenger side. Mid range and bass are working but not vocal. It works perfect with a cd mp3 and the radio but not with the aux.... Any suggestions?