toxicshock1134

I just got my car and the subs do not work, all the other speakers work fine. On the sub unit in the hatch there is a little harness but I cant find nething it could plug into, does it plug up to something, there is a harness that plugs into the sub unit that is black and plugs into the green connector. The unit makes kind of a noise but I dont know what is wrong with it, any help would be appreciated. Thanks