Hi,

(About Car Starter in general).

My car has a "car immobilizer". (Factory default).
Embedded in the car key there is a transponder.
When I insert the car key in the ignition (just insert)
a microswitch activates the control circuit of
the car immobilizer. Very close to the ingition key
(on the dashboard) there is a coil. When you insert the key
the control circuit will supply this coil with AC so that
the coil will produce a magnetic field. Embedded in the plastic
of the car key there is a second coil. This second coil
picks up the magnetic energy of the first coil and produces
a current that is first rectified and then used to supply
the electronic of the transponder also embedded in the key.
When there is enough energy stored in the key, the transponder
sends its unique code (each key as a different code). The
code is received by the immobilizer control circuit and stored.
When you turn the ignition key, the code stored in immobilizer
control circuit is sent to the engine control unit of the car.
Inside the ECU, the received code is compared with the codes of
all the keys of the car. If there is a match, the engine starts.


Luciano