most vehicles are modular, and use largely the same wire harness. That extra connector is likely for an oem infotainment system that has more features than your stock unit.
I don't have a wiring diagram, so I can't say for sure, but i'd be willing to bet its for oem nav, bluetooth, or some other feature you don't currently have installed.
I don't have a wiring diagram, so I can't say for sure, but i'd be willing to bet its for oem nav, bluetooth, or some other feature you don't currently have installed.