It might be possible according to this thread --->
? on 09 NAVI, is it possible
afaik no one tried it yet.
I should have pulled the whole Navi unit out and checked the back myself when I did the JDM hazard mod, but I forgot to see what inputs might be on the back.
It's still one of my dream mods to do...
The Navi isn't the best unit on the market, but it does it's job, the VSA is definitely a good feature to have, and the audio controls on the steering wheel sealed the deal for me. After reading the older threads of adding audio controls on the GD's I knew it would be a wiring nightmare for me. I figure if I get fed up with the OEM Navi, I can always upgrade it in the future with a nice Pioneer, and use a Pac adapter for the steering wheel audio controls. I'd be happy just adding a rear view camera to it. DVD playback isn't that important to me, and I just use my bluetooth headset for handfree (although it would have been nice to have it integrated in to the Navi).