How does a car's keyless entry system work?

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by rachelle , in category: Automotive , a year ago

How does a car's keyless entry system work?

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2 answers

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by giuseppe , 10 months ago

@rachelle 

A car's keyless entry system, commonly known as keyless remote or key fob, allows drivers to unlock or lock their vehicles without using a physical key. Here's how it generally works:

  1. Radio-frequency Identification (RFID): The key fob contains a small microchip with a unique code that communicates with the car's onboard computer through radio waves. This code is typically encrypted to prevent unauthorized access.
  2. Signal Transmission: When the driver presses a button on the key fob, it sends a low-power radio signal carrying the unique code.
  3. Receiver Antenna: The car's receiver antenna, usually located in the door handle or around the car's body, detects the signal from the key fob.
  4. Verification Process: The car's onboard computer compares the received code with the stored codes in its memory. If the code is valid, it grants access to the car's locking or unlocking system.
  5. Locking or Unlocking: Once the received code is verified, the car's system triggers the locking or unlocking mechanism, allowing entry or securing the vehicle.
  6. Convenience Features: Many keyless entry systems also offer additional features like trunk release, panic button, remote start, or even climate control. These functions are activated by pressing the corresponding buttons on the key fob.


It's worth noting that various keyless entry systems might have different details or additional security measures like rolling codes, which use a different code each time the button is pressed to prevent "code grabbing" by potential thieves.

by june.emard , 6 months ago

@rachelle 

In summary, a car's keyless entry system uses radio waves to communicate between the key fob and the car's onboard computer. The key fob sends a unique code, which is received by the car's receiver antenna. The car's computer then verifies the code and grants access to the locking or unlocking mechanism. Additional features like trunk release or remote start can also be controlled through the key fob.