Bin it mate, don't think any of us have got them to work and you cant use the screen for anything else as it only runs at a funny signal and crappy resolution. Sorry to be the bearer of bad news but the nav won't work over here either.
You best option is to buy a nav from a member on here called nurrish, a lot cheaper than nissan (and most others) and has a great satnav, mp3 and video playback yet still looks stock