gquiring, Fold the rear seats flat, then lift up on the carpeted and rubber dividers where the seat meets the cargo area. You'll see the harness there. It's the white one that isn't plugged into anything on my '05.
Alan, I ran my harness wires all the way up to the glove box so I simply open it up and unplug it. It's also nice there as it is a completely hidden installation with no tell tale wires hanging around the dash. You need to find out from Brian (JerseyParts) how long each wire harness is to make sure the Titan harness is long enough to do this. I ran mine under the rear seat to the door trim on the passenger side and up to the glove box from there. All this trim is removed with a simple tug staight up/out and pops back in when you're done.
ddibrano, the Pac provides line in sound to the Nissan radio if it has a plug for SAT on the rear of the radio. I believe even the non-BOSE radio has this feature. If your radio has a SAT button on the front, then you have the plug in the back. The Pac has to be installed on the back of the radio and then you need to plug an RCA/mini jack cord to get sound out of the IPOD. I started with this, but then got frustrated with changing songs without having wires all over my beautiful interior. I added the Griffen Airclick (like Alanpgh) but then thought "Why do I have all these buttons on my steering wheel that aren't useable anymore?" When this moduule came out, it gave me everything I wanted. Control on stock steering wheel buttons, display of music titles on stock screen, plus complete navigation of IPOD functions with stock radio buttons and no dash tear apart needed. Keep in mind, us '05 and older Mo's can't even play an MP3 disc in our radios!