Ford vehicles use both an active and passive antitheft system. The passive system, comprised of an ignition key embedded with a transponder that signals the engine to start, cannot be altered by anyone other than a licensed dealership. The active system, a factory alarm, only takes minutes to disable and reset when needed.
Press the unlock button on your vehicle's key fob to deactivate the alarm. If you've misplaced your remote for the car, use the PATS programmed key to unlock the driver's side door. Then, put the key in the ignition and turn the key to the "on" position. The vehicle's battery should be on, but the engine shouldn't be running.
Locate the override button on the alarm box, beneath the driver's side of the dashboard. Press the button and hold it in until the alarm beeps one time. The LED light for the alarm should stop blinking, indicating the antitheft system is disabled.
To reset the vehicle's alarm, put the PATS programmed key in the ignition and turn the key to the "on" position. Press the override button. When the alarm resets, it chirps two times and the LED light begins blinking.