Best thing to do is chase the wires and see wht they are hooked up to. Could be anything from an alarm to a switch for a light(s) the previous owner had installed.

Even easier, flip it on and see if it does anything.

 

Boom!!!!!

 

What brand liners are those though?

 

Yeah, forget the switch, what floor mats are those?

 

They are the brand MaxLiner. Got them on ebay for about $150 front and back. So about $25 cheaper than husky or weathertech. They fit nice in front, but could use some adjusting at the door sills in the rear! I recommend them.

Check out the ast page on my build thread and you'll see what I mean!