How Do Remote Anti-Theft Alarm Systems Work?

How Do Remote Anti-Theft Alarm Systems Work?

As the rate of crime is increasing day by day, auto-theft has become a common problem these days. In order to control auto-theft and vehicle intrusion, the use of anti-theft alarm systems is a common solution. You definitely want to protect your vehicle and there is no better way than to install a remote anti-theft alarm system in your vehicle.

Whereas some advanced systems require professional installation.

There are basically two types of protection systems for the vehicles; one is the anti-theft alarm system for cars and the other is the movement inhibitors. Both systems are beneficial and go some way to protecting vehicles. In this article I am going to explain the working of a remote anti-theft alarm system.

Remote Anti-Theft Alarm System

The remote anti-theft alarm systems for vehicles are basically available in two different types. One is a system that triggers the horn to alert the owner; the other is a system that makes use on an externally attached siren.

No matter which type of remote anti-theft alarm system you consider, both of them have three basic components that play the part;  the trigger, the trigger control switches of the system and an alarm.

A remote anti-theft alarm system covers all the entry points of a vehicle to signal the owner of an intrusion. Let us get into the detail of the working of a remote anti-theft alarm system of an automobile.

The Working of a Remote Anti-Theft Alarm System

Trigger Mechanism

The “trigger mechanism” is used in the device or the system to initiate the alarm. The trigger is usually made up of a single switch or a bunch of switches along with a drop relay. Once activated, the drop relay will not rest until, and unless, it is set manually. Without the manual reset the alarm system will continue to work, even if the trigger switch is disabled.

The best way is to add a timer in the circuit of the trigger that shuts off the alarm if triggered accidentally.

Also, pushbutton switches which are mounted on the hood, doors and trunk can be used for triggering an alarm. Generally the closed switches are set together with the switches on the door closing point where the trunk and hood latches. A combination of pushbutton switches and motion sensitive switches provide excellent protection For the vehicle. Moreover, the mercury used in the trunk and hood lights can also be made into triggers.

The Switches to Control Triggers

Basically the “trigger control switch” turns the remote anti-theft alarm system on and off. The switches should be arranged in such a way that the thief will not be able to disarm the system but the owner can easily start the vehicle without initiating the alarm.

The toggle switch is the most common type of control switch mounted in some hidden place outside the vehicle. One disadvantage of this switch is that the wiring and the switch itself must be made waterproof. Another one is that the switch may be deactivated if someone finds it.

The locking type is a common type of switch which can be mounted outside the vehicle. Such switches make use of “Pickproof” type locks and they provide outstanding security and protection as well as being a visual deterrent.


The alarm is undoubtedly an important component of the remote anti-theft alarm system which is used to turn the horn on or the system may also have its own separate alarm. Below are listed the steps to connect a remote anti-theft alarm system using the vehicle’s own alarm:

  1. Search for the terminal which should be present on the horn relay. This will set the horn on when it is connected to the grounding wire.
  2. Connect one wire with the terminal from the on/off switch.
  3. Connect the other wire to a pulsating terminal from the on/off switch. A pulsating terminal is a flasher type.
  4. Now connect the open end of the pulsating terminal with the trigger mechanism.
  5. Finally ground the trigger mechanism firmly and the alarm is all set using the vehicle’s horn.

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