This forum absolutely rocks!
If you did this hack and it does not work for you....YOU DID SOMETHING WRONG! EITHER THAT OR THE CONNECTION CAME LOOSE!
It's so simple that I screwed up the first time, thinking it can't be that easy. Just like how everyone else does it, ground parking brake wire form the rca harness, move guide-on wire (yellow/blk stripe) to different location (pin is on opposite side of the nav connection <-this is where I screwed up as there are two sets of balck wires with an empty slot in the middle) and away you go. I connected the guide-on wire (after moving it) to the parking brake wire, then grounded them both to the black ground wire in the harness. Works like a charm. This was done on an N5 with a build date of Sept. 2008.
If you have problems later on, SOMETHING CAME LOOSE! The unit will NOT LEARN about the hack.
Thank you AVIC411!
If anyone is having problems, shoot me an email or pm.