CODE - Description

Description

To increase protection against theft attempts, an electronic immobilizer system known as the 'FIAT CODE system has been adopted.

All the keys are equipped with an electronic transponder which transmits a coded signal to a special electronic control unit in the Body Computer. This allows the engine to be started if the code is recognised.

The code used in the communication, which takes place via aerial, changes each time the car is started up (rolling code). The code cannot therefore be reproduced, even with electronic scanners.

The main function of the Code control unit is to identify the code in the ignition key. The control unit contains a secret code which is used to communicate 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 stored in the unit memory.

When the key is turned ON 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 Code unit and, therefore, to the Body Computer.

The dialogue between the two units takes place via the CAN and a two-way recovery serial line (W line), used if there is a CAN failure.

The Body Computer makes the information which lights up the special CODE failure warning light in the instrument panel through the CAN.

For more details Characteristic of working principle 5580E anti-theft device.