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A technician’s hands connecting a small car alarm control module and wiring harness under a dashboard with a flashlight beam.

Guide · Audio, Lighting and Security

How Car Alarms Work and What They Protect

An alarm is a set of sensors, a brain and a siren. Here is how they work together and what an alarm can and cannot do.

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An alarm is a set of sensors, a brain and a siren. Here is how they work together and what an alarm can and cannot do.

The parts

A control module is the brain. Sensors on the doors, hood and trunk tell it when something opens, a shock sensor feels impacts and a siren makes the noise. Remotes and lights let you arm and disarm.

What an alarm does

An alarm draws attention and makes a thief hurry, which helps deter theft and break-ins. It will not stop a determined thief on its own.

Adding layers

The best protection is layered. A tracker helps find the vehicle, a kill switch or immobilizer stops it from being driven and tinted glass hides what is inside.

Avoiding false alarms

A good installer tunes the shock sensor so it ignores wind and passing trucks. We set the sensitivity and show you how to adjust it.

In This Guide

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