I am hoping someone can tell me what this box is. It is located directly under the left side fron tof the glove box next to what appears to be the vent mix door housing. It is a decent size black box with multiple wires coming out of it and it says rittenhouse electric - GM part #1624406 2. It looks like it is mounted on its side with one metal side or a metal mount plate. When the drivers door is open it makes a sound like someone dropping a golf ball inside a plastic box and you can feel the thump when touching the box. I just really need to know what that part # is and I can find nothing on the internet. Any help is appreciated.