I added aftermarket fog lights to my Base thinking it was prewired, well I didn't find any wires near the cavity for the fog lights.Probably be able to add options you BS didn't come with .
I'm thinking it's for the tow hitch, in case you didn't order it and add it later down the road.
Maybe it's the descresion of the keyboard operator when the options are written. Like on etis some options are" less option" and others are "without option".Mine is a BL + BL with tow package and it says "wiring pre-pack". I am also curious what it's for and how does mine differ from your "wiring prep-pack?
On the full size bronco that refers to the pre-wired spots that go to the battery. However, on the BS I don't see any extra wires already fed down to the battery.I wonder if it has anything to do with the "accessory ready" logo on the upper left and right windshield.
I do believe the bronco sport is prewired for different accessories including a roof mounted light, the wires are under the short forward roof rail track .On the full size bronco that refers to the pre-wired spots that go to the battery. However, on the BS I don't see any extra wires already fed down to the battery.