I really want a backup camera for my C3. But, i don't necessarily want to install an aftermarket system (which i might have to end up doing). This morning, i took the pre-existing system out of the dash, so i could look at the wiring behind the system, and see which ports were available. (Note... I don't know anything about wiring, and backup camera, etc. I took pictures, so that i could share them with the smart people on Priuschat.) It doesn't look like there is an RCA port available, but there is an empty plug, and plenty of space in another port. Any help would be greatly appreciated!