Heated seat (under the seat wiring diagram)

I have a 2011 Scion TC with leather heated seats and the heated seats are not working. I bought this car used from a dealership 2 years ago and am just getting around to see if I can fix the heated seats. My first thought was the fuses were bad. I switched out the fuses and still not working. I see a plug under the seat that is not plugged in to anything.

This may or may not be the problem, but I can't seem to find where this plug would hook up to. Have been trying to find a wiring diagram or some sort of tutorial online and just cannot find one. Can you help me with this?