porsche 996 sat nav problem

[simone]

I have a 996 carrera R reg with the factory fitted pcm1 screen and navigation I brought an adaptor from Nav TV that gives you a video input to the screen to do this you have to cut the cable that goes from the navigation unit to the screen and connect the unit between them the problem is I tried this and it didn’t work I have conned the wires back up but now only the top light on my navigation unit lights up and it doesn’t load the navigation disk do I have to buy a new lead and navigation unit or is there anywhere for me to take it to get fixed I don’t mind changing replacing it with the Becker navigation but will it work with the pcm1 screen