To increase protection against theft attempts, an engine immobilizer system known as the FIAT CODE-2 is used.The keys are equipped with an electronic Transponder device that sends a coded signal to a special electronic CODE control unit. if it recognizes the code sent, it allows the engine to be started.The code used in the dialogue, that takes place via an aerial coaxial to the ignition switch, varies each time the engine is started (rolling code): therefore the code cannot be reproduced even using electronic scanners.The role of the body computer is to recognise the key inserted in the ignition switch: it contains the secret code used in the dialogue with the key transponder.All the codes for the enabled keys and the code used in the dialogue with the engine management control unit are contained in the computer: when the key is turned to the ON position for the first time, if the key is correctly recognized, this code is transferred to the engine management control unit which remains indelibly linked to the Body Computer.On this version, a serial line W connects the body computer and engine control unit to carry signals required for key recognition and the exchange of codes in recovery mode.In the Code system, the control unit supply lines are protected a maxifuse that also protects the engine management system, body computer supply fuses and the control panel contained in the under-dashboard junction unit.