We own a1995 cadillac hearse driver used the wrong key car stall after 2km

The module shouldn't fail because of an incorrect key, it just shuts itself down for a period of time. Wait two hours, use the correct key and try to start the car. If it doesn't start, just leave the key on for three minutes and then try. If that doesn't work, then maybe the lock cylinder wires have failed (very common problem). There are work-arounds for this system to get you by until you can have it repaired.