They’re amazing little pieces of equipment, aren’t they? As
they say, you can’t fully appreciate something until it’s gone. And, if you’ve
had a keyless entry remote that’s stopped working, then you’ve likely severely
missed the convenience that having one offers. Carrying a pile of groceries to
the car? A keyless entry remote allows you to unlock your car without having to
put the bags down. Need to pop open the trunk when your hands are all tied up?
Push a button, and the trunk pops open!
Because these little devices are so convenient, we often
don’t think about what makes them work. So, we figured we’d give a brief
explanation of how keyless entry remotes work:
As you might have guessed, a keyless entry remote is
basically a little radio transmitter. Inside of the key fob, you’ll find a tiny
computer chip that’s attached to a radio transmitter. This transmitter then
communicates with a receiver that’s located inside of your automobile.
So, how do the two communicate with one another, and what
keeps a keyless entry remote from opening the doors of every car on the block?
Well, both the receiver and the transmitter make use of a
security system. Both are programmed to transmit and expect a specific 40-bit
code, which is then attached to a code that correlates to the action the car
should take. So, when you push the “unlock†button on your key fob, the
transmitter inside of the key fob sends the 40-bit code along with the unlock
code to your car’s receiver. The car’s receiver then checks the code against
it’s own: If they’re the same, it performs the function; if they’re different,
then it does nothing.
Now, there’s one more bit of added security, too. Both the
transmitter and receiver make use of a synchronized random number generator.
This allows them both to constantly change the 40-bit code that ties them
together. The purpose of this is to thwart hackers who might develop a way to break
past the 40-bit code, and also to ensure that the key fob remains specifically
tied to the car it works with.
So, as you can see, despite their tiny little size, keyless
entry remotes are actually pretty complicated! If you’re having trouble with
yours, or if you’ve lost or broken it, then take a look through our website and
pick up a replacement key fob today!
Source:
https://auto.howstuffworks.com/remote-entry.htm
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