Have you pulled the radio out?? I haven't personally seen the back of the 7th Gen radios, but I highly doubt that it would have an AUX Input. Ive seen a mod somewhere to turn a factory CD changer control port to an AUX Input. The 7th Gen actually has a radio relocation kit through scosche that allows you to keep the factory LCD screen. You have NAV though, Pioneer has a badass double DIN NAV setup. Its the AVIC-D1. Heres the link to it on scosche for the relocation kit for anyone w/o NAV
http://scosche.com/scosche_caraudio....&CategoryID=78