Arming System
WARNING: This page is about a different car, the 1997 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.
Use the following input sequence to arm system. Turn ignition switch to OFF position. Remove key from ignition. Open a door. Anti-theft indicator will flash. Lock doors using power door locks or remote keyless entry LOCK button. Anti-theft indicator will be on steady. Close both doors. Wait about 30 seconds for anti-theft indicator to go out. System is now armed.