AstroFriend, the anti theft alarm does not have to be programed. You can get another and it will connect in your car without programming.

Even if water drained from the car it will cause corrosion not only at the connectors but moisture can wick up the wires and get inside the wire bundle. So if you should get another air pump/security system unit try to find one with the wiring attached and cut maybe 6 to eight inches (20 cm) up the harness so you have good wire to work with.

The mounting plate which secures the wing is usually the part that leaks and water runs down into the well near the anti-theft electronics. Some have also found the rubber seal that surrounds the fuel fill door can leak.

That small unit you show in your pictures is just for the inclination/ towing alarm. I do not believe it has anything to do with the door locking.