What is this?

[BodyShopDropOut12]

I really wish i had a pic, but will get camera working soon enuff. But theres this button or switch on the drivers side floor. It's back there pretty far, and its inbetween, somewhat, of the clutch and parking brake. Metal cylinder pushing down to switch and clicking. Connected to small terminal bolted on floor with 3 leads(green, yellow, brown). Haven't found where they lead to yet. But it doesn't seem to be connected to my dash or cross thru fuse box. I know pics would be a lot more helpful, but any idea what this is or might be??