shoutie

Hi, I have a 2007 TDCI Ghia galaxy with a very wet ECU unit from under the passenger seat, the problem started from water getting into the footweels from the sunroof drains being blocked. I have removed the unit and sourced a working second hand unit. As i understand it this unit controls the central locking etc but i now have no electrics on the car at all. When you put key in ignition there is nothing not even lights on dashboard and the clock is also out. Could it be blown fuses from the water inside the ECU and if so where should i start looking? Any help would be appreciated! Ant