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Join Date: Mar 2014
Location: Northern IL
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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.
'15 Fiesta ST
'08 versa S hatch, 6sp (Traded for FiST)
'84 VW Rabbit GTI, running an Audi 1.8T
'13 Nissan Quest SL
'78 Mustang Cobra - next build, from 140hp to 300.
"A person who lives within their means suffers from a lack of imagination"