Except for the light, is there anything else wrong with the car? I just wonder how much of the actual damage is there, may be not much at all. Usually electrical systems can't take any significant damage. Either fuses start blowing or some parts of the system or the whole system just stop working.
Can you ask the dealer to let you take a look? May be just a couple wires need to be insulated. The dealer will want to replace the whole harnesses of course.
Something to think about...