What elements involved in the immobilizer?

The transponder immobilizer system is comprised of the following components:

Keys apart with a chip inserted into the handle of the same are not any different with other types of keys. In some brands also used a master key or programming key so that usually of a different color. None of these keys need batteries to operate.

Reading unit, this acts as the power source and as an antenna. Shaped ring and is placed in the top of the contactor the ignition key.

Immobilizer control unit, usually located near the steering column under the dash. There is a tendency to include within other components such as the instrument panel or with the same antenna.

Engine control unit with no differences have outer concerning the same units as not incorporated immobilizer. In cases where the engine has not Control unit as in some diesel, the element is incorporated DDS. This component is installed on the pump injection on the stop valve oil pump and fulfills the same functions as the ECU.



The version of immobilizer fitted with crypto transponder contains only an only difference from the immobilizer does not. This difference lies in the type of communication between the transponder key and immobilizer unit. As explained in the first generations the code sent by the transponder key is always the same, and this is compared with the memorized. In the crypto transponder system adds a new code to the control unit can be memorized by the transponder during system initialization. Peugeot is one of the brands that use this technology. Each time the ignition is switched on, this code is no longer sent, but a key that is obtained from the combination thereof with a number Random created whenever there is a new transmission. Since this code it is impossible to be known, it is very difficult to make copies of keys, thereby increasing system security.



Certain vehicles as some Renault and Rover used a remote control emit a signal to enable starting the engine in addition to unlock and lock the doors.

These remote controls can not be confused with people who only handle lock doors. An important source of information to identify the type control has a vehicle owner’s manual is normally delivery along with documentation to buy the same. Even in this manual you will find important information on what concerning the implementation of emergency in case of loss of the key or transponder.

The remote control may be incorporated into the handle of the same key (Renault) or may be a separate control (Rover and Chrysler). In this case there is no antenna. The reading unit is a code receiver Infrared sometimes located in the ceiling in the rear view mirror. The system is completed by the electronic control units which can immobilizer not handle or the central locking of the doors and distance. This system can act on electronic lock control unit (Renault) or only on the main relay (Rover case) which inhibits the motor boot.

Each brand has its way of warning the driver if the system is in mode blocking issue that we will deal in detail when we see punctually each system.



To be continued…