mtalking

Ok, I know this has been asked about before but I have a slightly different question. Aside from the NAV disks and the radio not working, would the unit play CD's and control the US model CD changers. Also, what if any are the connection differences? The reason I ask is that I have spoken to my audio installer who knows a little about the system and said that he could get it to accpet a video and audio signal from a dvd player, etc. So if it will play cd's I am going to give it a try. Thanks for the help.