By Everette Jamison
Experts estimate that thieves break into cars every 20 seconds. It's no wonder that most vehicles that are sold today come equipped with car alarms. When these alarm systems were first introduced, they were primitive. Early models only used a few wires, a couple of door sensors, and a horn to make a loud noise when the wires were "tripped." Today, they've evolved to help ward off would-be criminals from doing much more than merely forcing a door. In this article, you'll learn about the parts that make up a car alarm and how they work together to keep the thieves at bay.
The Components Involved
Most modern alarm systems use several different sensors, a horn or siren, a back-up battery, radio receiver, and a computer to oversee and monitor the other parts. The purpose of the computer is to control the parts that flash or sound when the alarm is tripped (for example, your headlights and horn). It does this by closing switches that are connected to the sensors. That sends a current to the horn or siren.
In the past, alarms would be connected directly to the car battery. Savvy thieves would simply cut the battery cables, severing the connection and disabling the system. Today, alarms are often still connected to a car's battery. But, they're also powered by a back-up. If the battery's cables are severed, the back-up power source takes over.
Types Of Sensors
A lot of today's alarm systems now come with several different sensors. Many car thieves no longer force doors to steal your vehicle. They can get in just as easily through a window. Often, they're not even interested in taking your car; they want something inside. To prevent theft, alarms now monitor your car's doors and windows, and even come with shock, tilt, pressure, and motion sensors.
There's a good reason why these things are monitored. Criminals can steal your vehicle without breaking a window or forcing a door. With a tow truck, they can simply lift it off the ground. By monitoring everything, the alarm system's computer can prevent that from happening. Some units even give a warning honk through the siren if a sensor is tripped.
Keeping One Step Ahead
Despite how sophisticated today's car alarms are, thieves still manage to circumvent them. After all, thousands of vehicles are still broken into every day. For automakers and alarm manufacturers, keeping one step ahead of the criminals represents a constant challenge. For the driver, they're still the first - and often, last - line of defense against auto theft.
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