Hello and welcome to just answer. Let me see if I can help you with this. Aparrently the arm/disarm switches which are mounted to the back of the lock cylinders have failed or fell off of the lock cylinders. Remove the driver's door panel and see if the little switch came off. Try to reattach it or replace it. Turning the door key should disarm the system. This vehicle did not have a securtity SKIM key, so the key itself is not the problem. If you need the procedure to remove the door panel, then let me know and I will send it to you.