Again This is UNHOOKING THE GPS which i stated you can do. But the N2 has a Gyro so i know it doesnt work on that.

The relay setup has been discussed but you wont have GPS. I know you can do it this way. Its common electronics. But Unlike most units you can just ground this takes alot more. and Since when did they need to see 12V ? its always ground on the N2 D1 and the AVH5700DVD. D1 needs double trigger ground and N2 need ground. D1 if not grounded all GPS options are locked out. So there is no way to make it all work together, until the D2 is release with a built in DVD player and editable EPROM Software.