The backup camera is normally turned on by the 12V signal from the reverse lights, I have been all over the "hidden" diag menus, (there are 2 that I know of), and havent yet found a way to turn it on otherwise. I had planned to one day install a small toggle switch to put 12V on the signal wire, which would trick the camera into thinking the cruiser was in reverse, but havent got around to it. I know this will work because I had tapped a full time 12v wire by mistake on install, and the camera would stay on unless I selected a nav function.