Finished some work on the car, and when I proceeded to button her up, I found this plug, but I don't know where it goes. I don't remember unplugging it. It's on the same harness that goes to the passenger side headlight assembly. Pic:

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.