Although Ford antitheft alarms vary slightly by year and model, there are a few basic steps you can take to troubleshoot and fix a problem with your vehicle's alarm. The most common problems arise when the alarm goes off without your understanding why. There are some strategies you can employ on any Ford model to temporarily fix problems arising from the alarm inadvertently being triggered.
Check your surroundings. Make sure the alarm has not been acting up for a legitimate reason and that no one is trying to break into your vehicle before attempting to silence or repair the alarm.
Press the "Panic" button on your key fob. Very often, problems with the alarm are caused simply when this button is accidentally pressed, and pressing it again should turn off the alarm if that is the case.
Unlock the car. This usually fixes problems with the alarm by disarming it.
Start the ignition. Almost all car alarms are disabled and reset when the car's ignition is started.
Check your vehicle's owner manual for more tailored instructions.