Actually, the rear park assist refers to the backup sensors, which is an option in th '12s.The rear park assist is where the car will park itself which is not available on the 2012 Mustang as an option. THe two options available for reversing is the rear view camera and the reverse sensing system which you probably have. Basically its those sensers on the rear bumper that are activated when you put the car in reverse. The sensers will beep at you when you get too close to an object
If you look at the lower rear diffuser (the black plastic part) you'll have 4 sensors -- one on either side of the license plate and one on each side toward the corners.Ok thanks everyone. I tried to search for it on the owners manual under rear park assist but that wasn't in the index.
I also just assumed since I had the rear view camera it wouldn't have the sensors as well.