The very first immobilizers appeared during the Soviet Union and were called "secrets". Already from the name "secret", it is easy to guess that the principle of operation of these devices is based on the opening of electrical circuits in the car in places that are known only to the owner. Without knowing exactly where the secret is, it is almost impossible to start a car in the field. To be more precise, it is possible to start it only if you have diagnostic equipment, spare cables and, most importantly, time. That's the time the hijackers do not have, so stumbled upon the secret they almost always left the car, which they did not think possible to start. One of the main problems of secrets was that it was impossible to think of such a variant of installation, which was not used by anybody and, at the same time, everything would be unnoticeable for others, that is, everything would look as if it was not there at all.
So, what is an immobilizer and how does it work? It also works on the principle of disconnecting electric circuits, but their work is built in such a way that to start the engine it is necessary to enter the code. If you just break the immobilizer, nothing happens and the car doesn't go, even if you connect the wires. The first versions of the immobilizers, of course, could not boast of it, so the attackers preferred to break them, but after they were connected not by special wires, but through the standard system of wires, avtoindent.ru, which had been previously changed to monochrome, they began to look much more serious. Besides, they became not only more reliable, but also smarter. If earlier immobilizers worked according to the principle "will not start - will not leave", now they work according to the principle "has started - it does not mean that will leave". Immobilizers began to get false wires, learned to change the polarity and break the chains. And the most advanced immobilizers have also become hidden. Hidden immobilizers have become very popular because the criminal spends time to get into the car, spend it to disable the alarm system. Tormented with blockers to break them and start the car. Turns it on... and doesn't go anywhere! If you start the car, and it does not go, it is very difficult to guess at once that it is installed immobilizer, and if you still guess that it is it, then you need to find and disable it, which takes time. And when the bill goes for seconds and the owner is about to appear, many people leave the car and run away to find another, less secure car.
If you are ready to buy an immobilizer, then you need to wait a while and figure out what kind of immobilizer you want to buy. These devices are quite expensive, but the price does not mean quality, so it is difficult to say with certainty that this or that immobilizer will reliably protect the car. If you do not understand them, it is very dangerous to trust the seller of an ordinary car shop, because he (she) can sell not what you need, but what you just need to sell. But even if you buy exactly what you need, it is still an open question to install this device. It is best to buy immobilizers in specialized shops that belong to companies specializing in the sale and installation of anti-theft devices. Not just companies, but large and well-known companies, whose reputation inspires confidence, because addressing the "neighboring garage" you can unwittingly turn to those who then steal your car or give a tip to others. Large firms can boast of a large number of positive reviews, and the more reviews, the less likely it is that there will be a person who will be hacking or selling data about the owners and alarm system hijackers.