The Ford Motor Co. is the second-largest manufacturer of cars and trucks in the U.S. Modern automobiles such as the Ford Focus, Taurus and F-150 trucks all come with a built-in antitheft alarm system. The alarm is easy to set off yourself, which leads to a honking horn and flashing headlights. While this response is meant to scare off thieves, it can irritate you if you do not know how to reset the alarm.
Shut off the panic alarm by unlocking the door and inserting the Ford key into the ignition.
Turn the key counterclockwise one turn, and the horn will stop honking. This is known as the "ACC" position. You also can twist the key two turns clockwise to the "Run" position to stop the alarm. This is the position where the inside lights and control panel are on but the engine is not running.
Remove the Ford key and exit the vehicle. Click the "Lock" button twice within three seconds to reset the alarm. You will know the alarm is set when you see the headlights quickly flash on and off and you hear a brief chirp from the vehicle's horn.