2000 S10 Blazer -- Where does this plug go?
 

I've just spent a god-awful amount of time replacing the heater core in my project car, a 2000 S10 Blazer LS. I took lots of pictures while I was disassembling it so I could remember where everything went. Most of it went back without much fuss, but there's one plug dangling down from behind where the glovebox goes that the label fell off of and I can't for the life of me figure out where it goes. It's wrapped together with the big bundle of wires that leads to the main wiring harness (the one with the bolt you have to undo to unplug it), but branches off a few inches before it gets there. I can barely see it in my disassembly pics and can't tell where it was going then.

Help me out, please!

I have pics of the mystery plug. The first is looking up from the floor -- the heater box is to the right and the wiring harness is to the left. The second is looking at it from the front.

http://imageshack.us/a/img835/6765/9cd3.th.jpghttp://imageshack.us/a/img10/2410/ywzg.th.jpg

Anyone? Please?