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How does a car alarm work?

icon/user/avatar/20 Created with Sketch. By Viktor Kalutsky

Before car alarm systems cars were stolen out of people's driveways on a daily basis then parted out, in fact, there were about 3.7 million automotive-related break-ins that happen every year. This increasingly decreases over the years when alarm systems got introduced to the car market. Some say crime rates still happen but because of an alarm system, they decreased an incredible rate over the years which is a good sign letting us know that they work. There several different types of alarm systems but they all have the same goal to keep your car in your driveway and not stolen.


Firstech. “How Much Does a Car Alarm / Security System Cost?” Compustar, 11 June 2018,



Alarm system Basics

There are many kinds of alarm systems the most common alarm systems today are made up of a computer that receives and responds to your keycode and is connected to a loudspeaker and different kinds of sensors around your car. The way it works is pretty simple when sensors don't receive any unusual activity they remain silent but active, only when the sensors are activated the alarm will sounds. Older cars have just a few sensors but never cars can have up 10 or more sensors.



Newer cars have many sensors that they respond to break-ins, damage impact, or loud noise around the vehicle these sensors are designed to scare and notify the owner that someone is messing with their car.

  • Door Sensors: This is the most common one used across all the vehicles on the market they are triggered when the car is locked and the door opens the alarm will sound but it will not stop the burglar from breaking the window getting in your vehicle.

  • Impact sensors: It is more common on newer vehicles which are a little better the door sensors because it senses if any window is smashed or there is any manage to the car which is super useful. 

Tilt Sensors: Are sensors that activate when the vehicle is lifted in case someone wants to tow your car or flip the vehicle the sensors will activate and let you know.



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