I'm looking to buy a used 2004 DC 4X4 to replace my 2003 which was stolen. Anyway, I was looking at one today and notice some sort of computer mounted on the wall behind the seats in the rear. (Where the jack is kept... on the driver's side) The owner had no idea what it was. Can anybody here give me a clue?? I didn't have this big box thing in my 03 truck. It's about 4.5"X3" with lots of wires connected to it.