Remote Car Starter: How Does Keyless Entry Work? - Science ABC

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A remote keyless entry system consists of a remote, which, when activated within a certain range, can lock, unlock and perform various other functions within a car. Such a remote consists of a short-range radio transmitter that sends radio waves to a receiver unit inside the car, which triggers the aforementioned functions.

A remote keyless entry system consists of a remote, which, when activated within a certain range, can lock, unlock and perform various other functions within a car. Such a remote consists of a short-range radio transmitter that sends radio waves to a receiver unit inside the car, which triggers the aforementioned functions.

Unless you’ve been living under a rock all these years, you have surely seen people exiting their cars and pressing a button on their remotes (often called “fobs”), which makes their cars produce a distinctive chirping sound and makes their lights flash.

Keyless car remote & car
Locking and unlocking using a ‘car remote’ (Photo Credit : TuRbO_J / Wikipedia Commons)

Similarly, people do the same thing when returning to their vehicles. Press a button, hear a chirp and see a flash of lights – and voila! The car is unlocked!

You likely know that such a ‘car remote’ helps to lock and unlock a car, but do you know how it works? How can it tell the car to lock/unlock doors from a distance of a dozen feet or more?

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