module

What is the module in front of the a just underneath the battery.Mine had got some water in it after the accident. When the frame got straighted there was some welding to do in that area and now it won't start. The module or what erver it is had been crack and has a hole in it. So if water was in it or a spot of weld got got on the board would this stop it from starting. The battery was out of the car.