OEM (built into the vehicle at the factory).An immobilizer generally will not offer any audible or visual theft deterrence, nor require any more input from the driver than from the driver of a non-immobilizer car.Ĭar alarms can be divided into two categories: This version had the car owner carry a receiver, which would buzz if the car ignition system was tampered with.Ĭar alarms should not be confused with immobilizers although the purpose of both may be to deter car theft, they operate in a dissimilar fashion. A later alarm inspired by an early version of a remote starter was published in 1916. This version was manually armed, and triggered when someone tried to crank the engine. Although inexpensive to acquire and install, the effectiveness of such devices in deterring vehicle burglary or theft when their only effect is to emit sound appears to be negligible.Īn early version of a car alarm for use as a theft deterrent was invented by an unknown prisoner from Denver in 1913. Such alarms may also cause the vehicle's headlights to flash, may notify the car's owner of the incident via a paging system, and may interrupt one or more electrical circuits necessary for the car to start. Car alarms work by emitting high-volume sound (often a vehicle-mounted siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination of these) when the conditions necessary for triggering it are met. JSTOR ( September 2009) ( Learn how and when to remove this template message)Ī car alarm is an electronic device installed in a vehicle in an attempt to discourage theft of the vehicle itself, its contents, or both.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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