All motorists take care of their car. And not only about the appearance and technical condition, but also about the protection. This is very important, since the problem of car theft is relevant all over the world. But security systems tend to break down, their emergency shutdown is required, and sometimes a service one.
Security systems are constantly being upgraded. But the general operating principle remains unchanged. Several critical parameters are monitored, such as body position and door opening. When the position of the body changes, a signal is sent to the control unit, which converts it and the siren gives a signal. A signal is also sent to the key fob, if there is feedback.
Even the simplest car alarm has many functions. For example, locking doors when the ignition is turned on, closing windows when arming. And all of these features can be turned on and off to improve vehicle performance. It is also sometimes required to completely disable the alarm. If you left the car in the service for a while, then you will need to completely disable all security functions.
Car alarm composition
The base is the central unit to which the sensors and actuators are connected. Sensors:
• blow;
• volume;
• limit switches on doors, hood and trunk.
Executive devices:
• power window drive;
• central locking drive;
• siren.
You can also add a Valet button and LED indicator. The latter is necessary to monitor the status of the alarm, it can be made both as a separate LED and as an LED matrix. But the Valet button can be classified as input devices, since it is used to program alarm functions.
But you can not only program with it. The main task is to transfer the security system to the so-called service mode, in which all alarm functions are disabled. Also, an emergency shutdown can be done with its help. For example, if the firmware of the key fob is out of order, you will not be able to arm or disarm the car. In this case, an emergency shutdown is required.
How to find the coveted button?
If you have a car alarm installed on the service, you must provide data about the button. The fact is that with its help the protection is turned off in a matter of seconds, so it is very valuable for hijackers. And a competent electrician will never install a button in a conspicuous place, it will be in a place that only you will know about.
The same cannot be said about car dealerships. They install security systems so often that they do not particularly worry about the location of the service button. Usually it is practically in sight, covered only with a plug. When buying a car with an alarm, be sure to ask the seller about all the intricacies of the security system.
But you can find the button yourself, you just need to find the central block. According to the instructions, you need to see which pins the button is connected to. And from these pins of the block there is a thin wire to a small-sized button.
