Connecting rear camera to aftermarket nav Hu

Can anyone suggest where I can access the composite output of the rear camera so I can grab it & connect it to my aftermarket nav Hu?

I guess I can get it at the rearview mirror, but no idea which wire in the harness the video would be. If I could grab it where it enters the pillar on the way up to the mirror it mght be a little easier.

 

Try this link. You have to scroll down to find the manual your looking for. There is a wiring manual that you can download.

 

Thanks...actually found this after I posted:

http://www.tacomaworld.com/forum/audio-video/19553-2009-nav-install-hook-up-back-up-camera.html

Don't know why it didn't come up in the search before I posted, but it was a "related thread" after I posted...