Transponder car key

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The transponder chip paralyzes the vehicle immobilizer when the car keys are used to start the engine. The majority of car keys made after 1995 contain transponder chips.

When the car keys are rotated in the ignition, the engine control unit (ECU) on the car sends an electronic message to the key, and it will allow the car to start just as long as it receives the correct message back. So even for simple car keys without buttons, the keys should be cut properly to turn the key and well programmed properly to disarm the immobilizer. Key car with chip can be programmed by special programmer.

Video Transponder car key

Transponder

The word "transponder" is the portmanteau "transmitter" and "responder".

This word began to be used around 1945. In basic terms, transponders are miniature electronic chips that have non-volatile memory, a type of memory that does not require constant energy for retention. Along with it the electronic chip is a set of rolls, very fine wire circular around the tube. These coils look similar to the coils that will be found in electric motors.

There are two basic types of transponders. The first is a paired electric transponder system. Electrically coupled transponder systems are not limited to small areas for transmission but can transmit messages or signals for different ranges including several inches to miles, as used in satellites and airplanes. This system requires a large amount of constant electricity to operate. The second type, used by car manufacturers, is called the magnetic transponder system. The magnetic paired transponder system is passive. This means they do not need constant electricity and thus do not need their own resources. They operate in a frequency range of 125 kHz. Because magnetic coupled transponders do not have their own power source, they are very limited in communication range and generally operate within the range of 1 cm to 15 cm. Since this is a radio frequency, it can penetrate the material that will make the transponder not immediately visible, like plastic or rubber in the key bow.

The key identification process is similar in most automotive transponder systems. Once the key is inserted into the ignition key and switched to either 'on' or 'run' position, the induction coil mounted around the ignition key sends an electromagnetic energy field. The winding in the transponder chip absorbs the energy and power of the electronic chip to transmit the signal. Signals are usually alphanumeric sequences that are considered as identification codes. The induced coil reads the signal and sends it to some kind of computer device to recognize the signal. If an acknowledged signal is already present in the computer's memory, the received signal and other electronic components inside the vehicle are set into motion to allow the start of the vehicle or continuation of the running engine.

Immobilizer systems based on transponders may not be as secure as they are. Some immobilizer systems tend to remember last key codes for so long that they can even receive non-transponder keys even after a few minutes retrieve the original key from the ignition key.

Maps Transponder car key

See also

• Remote lockless system
• Smart key
• Lock (key)

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References

src: image.dhgate.com

External links

• Instructions on how to change car keys

Source of the article : Wikipedia