I have the pkg 2 2008 prius without nav or anything, but i have the reverse camera.. i was hoping to splice into the video feed and install a manual button that would switch the video to that feed (trick the screen into thinking i am backing up)... does anyone know where the camera cable runs, though? I was hoping to do this without pulling the whole radio out, do not know if there is room behind there to wire up stuff anyway.. any help appreciated!