Hi all this is my first post after my intro one so here goes. I got all parts for the touch screen nav fit, also got the harness from the DVD drive to the front and the connection from that to the rear nav screen, there were cables over g/blk to w/brown, blk to blk, y/g to y/g(all these into cd loom, then the green to green in main harness, there is also a connection under rear seat blue plug, this is in the rear to front loom. Now turn power on have nav screen and menu screen but that's it, press audio button I get "communication fault consult dealer", and press climate button I get "ignition off, no AC control" plz any ideas what's wrong??. Any help very much appreciated.