dude i'm a little pissed. i bought the NN04B and there is no orange wire. here's a link for the EXACT one i got:
Scosche NN04B Nissan 2007+ Radio/Stereo Wire Harness - eBay (item 350245442189 end time Sep-26-09 16:04:57 PDT)
as you can see even in the pictures there's no pic. if you then go to schosche.com and look at their application guide, THEIR picture of the NN04b has no orange wire in ITS picture either!