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FWIW, I've got one, too... I have no idea what it does, but when I routed the Ford EFI through there I needed to relocate it a bit. I left it plugged in, since I had no idea what it did. The vehicle in question at my end is a 1990 Amigo that had a 2.6 4ZE1.
I retract my former comment -- I was thinking of a smallish black box on the passenger side, behind the front speaker. I pulled mine out and looked at it -- apparently in the near past, I labeled it "buzzer." It has seven wires leading into it, FWIW.

Randii