How Does Anti-Theft Alarm System or Car Alarm Work?

Anti-theft alarm system

What Is An Anti-theft Alarm System?

Motorcycle and car owners consider their possessions valuable. However, motorcycle and car thefts are common in most countries worldwide. To prevent cars and motorcycles from being stolen, manufacturers use different methods. An Anti-theft Alarm System or Car Alarm is a type of device or method which contains unauthorized access to a motorcycle or car. Hence, the manufacturers fit such a device to prevent it from being used by an unauthorized person. To facilitate this, they install various devices in cars.

How does the alarm system or Car Alarm work?

The Anti-theft alarm system works with the help of sensors installed in and around the vehicle. An impact or the movements inside the car activates the sensors. It, in turn, triggers the alarm system and sounds the alarm. Finally, the alarm goes off and alerts the owner/people. Even a change in the vehicle’s position can alert the tilt sensor and activates the anti-theft alarm system.

Furthermore, you can buy a car with factory-fitted alarms by the manufacturer (OEM), or you can install an aftermarket unit. OEM systems usually have the Remote Keyless Entry System, which helps Lock/Unlock the doors and even start the engine. Besides, Remote Keyless Alarm systems use a radio receiver, immobilizer, motion detector, and wireless USB systems. Additionally, the Remote Keyless System operates on robust cryptography authentication mechanisms.

Car Alarm system
Car Alarm system


The alarm system alone may not be enough to prevent car theft. Unfortunately, well-organized crime syndicates can bypass such systems. Nevertheless, it is the most basic anti-theft alarm systems technology your car must have. You may need a more advanced technology if you want to prevent vehicle theft.

The best approach is to install an engine immobilizer in a car. Nowadays, many vehicles come with pre-installed immobilizer units which can give protection through the ignition system. OEM immobilizers function through the ECU/ECM (computers) installed inside the vehicle.

However, technology also moved fast in recent times. Luxury cars employ cutting-edge technologies to prevent unauthorized access to the ignition system. For example, manufacturers now place simple lock and key mechanisms with the new-age biometric identification and RFID tags as anti-theft alarm systems. Basically, the ECM must be able to read the RFID tag attached to the key for the ignition to take place. In addition, the manufacturers employ more advanced mechanisms such as two-way authentication to safeguard the system further. Thus, the car alarm systems are now at new levels, making cars secure.

Besides, some manufacturers use custom names to describe their anti-theft alarm systems. E.g., Toyota uses the term ‘Theft Deterrent System.’

Watch The Anti-theft Alarm System Or Car Alarm In Action Here:

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CarBikeTech is a technical blog. CarBikeTech Team members have experience of over 20 years in the automobile field. CarBikeTech Team regularly publishes specific technical articles on automotive technology.