What is a transponder ?

Transponder Key

Transponder element inside a key


The word transponder consists of two words: Transmitter and Responder.

You may be familiar with the word transponder as it relates to avionics. A transponder in an airplane receives pulses from the ground control tower and then replies with a set of coded pulses in order to identify itself.

A car transponder works in a similar way. When you turn the key in the ignition, the electronic chip that is inside the head of the key receives a set of pulses from the ECU (Engine Control Unit). In return, the transponder key replies with a set of coded pulses. The ECU then evaluates these pulses. If the pulses from the transponder are the same as the on board car-computer is expecting to receive, then the car will start. However, the pulses are not the same as the computer is expecting, then the car will not start.

For more information about the transponder car key please check here: Transponder Car Key After a new transponder key is made it has to be programmed. S.A. Locksmith & Security technicians are using the latest locksmith programming equipment. This allows them to program the electronic chip, in the transponder key, to the code required by your car.

If you need a replacement key made, please call S.A. Locksmith & Security, any time. We are always open! Our friendly dispatchers are on duty 24/7, 365 days, ready for your call.