I have an SLT Sport with the rear slider window. If I remember correctly I read somewhere that if you have the rear slider window you won't have rear defrost. The little rear defrost wires are not in the window, but I have a rear defrost button. It's the button in the middle of the right climate control ****. I can push it and the light will come on as if the rear defrost is on. Anyone else notice this or is the button for something else?

 

That's for you side mirror defrost.