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Well I can tell you the steering wheel controls are in the main harness. Its just 3 wires. You can actually add them if you like. I would assume that the other 2 plugs are for the ipod/sat or bluetooth and the other might of been for the Rockford system used in the 07-09 hatchbacks. My 09 versa sedan only had 2 plugs. Main and antenna. We had an 09 hatch SL with bluetooth, but I never got to look at it.
