I have a 2012 Santa Fe Limited that I purchased used. I was able to Download the Original window Sticker which shows that the car when new had the Infinity System with navigation and rear view camera. This was an upgrade from the regular infinity system with 6 disc changer. However it currently has the non-nav Infinity radio with the single CD and no rear view camera. I would like to put in the rear view camera but am wondering if the wiring harness is going to be different. I was als considering getting the original Infinity head unit with navigation if it will simply be plug and play. The GPS antenna is on the roof too. Do I need to pull the head unit to see if there are currently unused connectors that would be for these options? I pulled the tailgate trim panel and didn't see any loose connectors but I think there is just the harness that connects the license plate lights. Does the stock camera that is built into the tailgate trim piece just connect to that? Where is the build sheet posted?

Any help is appreciated.
Thanks