The vehicle is equipped with an electronic engine blocking system called Fiat Code, which increases the vehicle''s protection against theft.The system is automatically activated every time the key is removed from the ignition lock barrel.Each key contains an electronic device which modulates the signal emitted during engine ignition from an antenna built into the ignition lock barrel. The signal is in the form of a code, which differs at each ignition process, whereby the control unit recognises the key and allows ignition.Once the key is inserted in the ignition switch and turned to the MAR position, the engine management control unit sends a request to the Body Computer, which in turn sends a request to the antenna to read the transponder. If the Body Computer correctly identifies the transponder, it opens a dialogue using an encrypted communication protocol with the engine management control unit.If the identification is positive, the engine management control unit is able to carry out its normal activities, in the first instance, obviously, starting the engine.If identification is negative, engine start up is inhibited.The code embedded in the key is different for each ignition attempt. Moreover, the code cannot be reproduced, even with an electronic scanner. Communication between the antenna and the transponder occurs at a short distance (around 50 cm) for security reasons. For this reason the antenna is positioned in the ignition lock barrel.The Code function is protected also in the event of malfunction of other Body Computer operations.Communication between the engine management control unit and the Body Computer is via the CAN network. Communication between the instrument panel and the Body Computer is also via the Can network.The Body Computer will light up a warning light on the instrument panel if the key code is not recognised.