My back windshield was leaking when it sat in the rain so I took the piece that stretches from side to side (inside the back windshield) and I saw a black rectangular box with wiring ran to it. I figured it must be the defroster or antenna. But whatever it is, it is broke in half. It also looks like someone has tried to put caulk on the inside of the windshield. Does any one know what that box controls and where the leaks may be coming from?