198001501 - 5580E ANTI-THEFT DEVICE
FIAT CODE SYSTEM
The vehicles are equipped with an electronic system known as the FIAT CODE to produce the engine immobilizer function.The FIAT CODE system only allows the engine to be started by means of the Engine Management Node (NCM) after a secret code, memorized previously in the NCM, is received.The second generation Code system is incorporated in the Body Computer Node (NBC).The FIAT CODE system comprises the following components (in addition to the Body Computer which acts as a control unit):- CAN line for dialogue between the NBC and the NCM- Engine Management Node (NCM).- electronic key containing a transponder with a secret code;- an aerial that reads the code contained in the key transponder;1 - Body Computer (NBC)2 - Engine Management node (NCM)3 - Aerial4 - KeyOperation
The FIAT CODE allows the start of the engine management by the NCM by means of a coded dialogue between the NBC and NCM during the stage that precedes starting.After the key is turned to the ON position, the NCM sends a code request to the NBC which only responds after having recognized (via the aerial) a known electronic key in the ignition switch.If the secret code in the answer is valid, the NCM continues with the regular engine management activities, allowing the engine to be started up.The NCM can only memorize the secret code through a special procedure.Interaction between the fiat code and the key
Each key contains a transponder with a SECRET CODE.As soon as the key is turned ON, the transponder converses with the NBC which, having recognized it as one of the enabled ones, continues with the NCM recognition strategy.If the identification code is not recognized, the procedure is aborted and the engine cannot be started.The recognition of the SECRET CODE takes place by means of a challenge-response algorithm with the exchange of an encrypted code. The code recognition time is a maximum of 160 ms per attempt.The FIAT CODE attempts the transponder acquisition for up to 1.3 seconds.Communication between the engine control node and the fiat code
The dialogue between the FIAT CODE (NBC) and the NCM contol units takes place via the CAN.Every exchange of information between the FIAT CODE and the NCM is guided by the NCM (the NBC never interrogates the NCM but only responds after a request).After KEY-ON, the flow of code exchange operations between the NBC and the NCM depends on the status (blank or memorised) of the NCM.If the NCM is pristine, the procedure involves sending the secret code request to the NBC: in this way the NCM learns the secret code and stores it in its memory. This procedure is known as CODE RECORDING.If the NCM has already been programmed, the procedure involves checking that the codes stored in the engine management control unit memory and the one memorized in the NBC correspond:This procedure is known as CODE VERIFY.1 - Key on2 - NCM initialisation10- FLGOPT = 1 ?3 - NCM status memorized OK, pristine NOT OKA - CODE VERIFY7 - Is the secret code valid?8 - the operation of the engine is allowedB - CODE RECORDING4 - Memorisation successfully completed?5 - the operation of the engine is allowed6 - the operation of the engine is not allowedCode recording
The CODE RECORDING procedure is the memorizing of the secret codes in the engine control unit.Only after the NBC has memorized the identification codes and the secret codes, is the NBC ready to satisfy the request to transmit a code to a pristine NCM.After a key on, the engine management unit initialises its software and requests the secret codes if it is blank.If the NBC is not pristine, it responds by sending the secret codes, but only after having recognized an authorized key. If the key is not authorized (unrecognized) or there is no key, the NBC does not respond.If the NBC is pristine and there is no transponder in the key and a request is sent for secret codes from the NCM, the NBC does not respond.Code verify
This is the standard procedure that is repeated during the life of the vehicle each time the user insesrts the key in the ignition and turns it ON. this procedure enables the starting of the engine if the key inserted is enabled.If it is not completed, the code verify procedure continues even when the user turns the key to the starting position.After the key is in the ON position, the NBC recognizes whether the transponder in the key is one of those that is enabled.At the same time, with the ignition in the ON or starting position, the NCM initializes its software to check whether the secret codes have been memorized. If the answer is yes, it sends a request to the NBC.If the result of the transponder recognition is negative (incorrect transponder, no transponder in the key, etc.), the NBC will sent a negative authorization response to the engine management control unit.In response to this request, it only sends the secret encrypted codes to the engine management control unit if the transponder is recognized as enabled.If the NBC is pristine and the NCM sends a request for secret codes, the NBC, after having recognized the presence of a recognized transponder, responds by sending a positive authorization reply.Communication via the can
Communication via the Body Computer and the NCM takes place via the following two CAN messages:- immo code request (sent by the NCM and received by the NBC)- immo code response (sent by the NBC and received by the NCM)Protection codes
The protection codes used by the NBC and NCM are listed below- UNIVERSAL CODE: this is the code that an unprogrammed NBC sends to the NCM when it detects the presence of a transponder in the key. The "vehicle protection" warning light comes on at a frequency of 1.6 Hz and 50% duty cycle. The warning light flashing signals that the system is properly connected and working, but the vehicle is not protected by a code.- SECRET CODES: these are the codes in the transponder. They are is stored in the transponders contained in the keys when the transponders are programmed and in the NBC when the keys are programmed at the end of line.- ELECTRONIC CODE (PIN): this is printed on the CODE CARD, which is given to the vehicle owner. It takes the form of a 5-figure decimal code (0 is not permitted). It is used to access the NBC memory in protected mode in order to reprogram or program new remote control keys and/or perform specific diagnostic functions.- IDENTIFIER: This is resident in the transponder and different for each transponder. It is stored in the NBC during the programming procedure. The NBC manages a table of enabled identifiers and another table of disabled identifiers.Body computer
The FIAT CODE is an internal function of the Body Computer Node (NBC).The main FIAT CODE functions are:- recognizing the introduction and rotation of a key in the ignition (ON);- conversing with the key transponder by means of the immobilizer aerial;- to store up to 8 identification codes;- memorizing the secret codes;- to manage a list of 4 permanently disabled identifiers;- managing the CAN line towards the engine management control unit;- managing the activation of the warning light on the panel via communication with the instrument panel;- carrying out the autodiagnosis for the CODE system functions.FIAT CODE supplied as spares:If the FIAT CODE function is replaced, the entire Body Computer must be replaced. To replace the Body Computer, a request must be made to the Parts Dept. providing the vehicle chassis number as described below.Aerial
The aerial assembly comprises an toroid type aerial with a connector built into the aerial body.The wiring connected to the NBC is incorporated in the dashboard cable loomThe aerial is supplied by the NBC to energize the key transponder.Since the aerial needs to be as close as possible to the transponder (on account of electro-magnetic immunity, the limited range of the transponder and small dimensions) it is fastened axially to the ignition switch.- 1 CODE aerial- 2 Ignition switchIgnition key
The mechanical key contains a cipher transponder in the grip.The moment the key is inserted in the ignition and turned to the ON position, the transponder is energized by the aerial and responds by emitting the rolling, encrypted secret code.If the code is recognized as valid, the NBC sends the engine control unit, on request, a coded signal allowing the engine to be started.Up to 8 keys can be programmed in the NBC | The keys are supplied already memorised by the production plant.All the codes are also stored in a database managed by Parts.When the new vehicle is delivered to the customer, the service network does not need to carry out any memorisation procedure.If the keys are mislaid or additional keys are required, make the request to the Parts Dept. as described in Op. 5580E ANTI-THEFT DEVICE |
Transponder in the key
The transponder in the key has the following stored in its memory:- SECRET CODE;- IDENTIFIER which is different for each transponder produced;- PROGRAMMING DATA for the secret code.The identification code differs from transponder to transponder to guarantee that no two transponders have the same identification code even if there is a request for a duplicate in the Network.Reprogramming keys
Reprogramming the keys involves storing the keys enabled upon vehicle start-up in the NBC.Both the new keys to be programmed and those already programmed are inserted into the ignition to be recognized by the NBC: this memorizes the keys presented during the procedure in the enabled identification codes tables and transfers those no longer presented to the disabled identification codes table.Disabled keys table
If an enabled key is no longer available (mislaid, stolen or no longer working), the subsequent key programming procedure (in which the key is no longer presented) disables its operation.The NBC manages a table in the EEPROM that can contain data on 4 disabled keys: the identifiers of enabled keys not presented during the reprogramming procedure are transferred to this table.If the disabled keys table is full, any new key will replace the first entered in the table.This table also allows the traceability of keys used on the vehicle.Key reprogramming procedure
The key reprogramming procedure is performed/guided by the EXAMINER Diagnostic Equipment: this procedure is activated by means of access protected by the vehicle PIN.Continue by following the instructions on the diagnostic instrument/EXAMINER.It is possible to program up to 8 enabled keys.Deleting a lost key from the memory
At any time it is possible to delete a lost key from the memory using the EXAMINER Diagnostic Equpment. The identifier of this key is transferred to the disabled identifier table and will no longer be recognised.Code card
This card shows:- The emergency code (electronic code) that allows the Service Network to program electronic keys (TEGs) and remote controls using an EXAMINER.- The emergency key mechanical code identifies the mechanical profile of the key and must be specified on the order to receive the key already cut.1 - Electronic code2 - Mechanical codeOperation
The electronic emergency code is also used for system diagnosis and for other operations using Examiner or other diagnostic instruments. Many of these operations (e.g. key programming) can be carried out only once this code has been entered.Before any operation, it is therefore necessary to ask the Customer for their Code Card. | The Code Card must not be left in the vehicle in case it is stolen. |
Vehicle protection warning light
The vehicle protection warning light is located in the instrument panel and is controlled by a message from the NBC on the B-CAN.Operating mode and vehicle protection warning light flashing timeThe NBC controls the switching on of the vehicle protection warning light in the panel, via the CAN, flashing to signal programming errors for the Body Computer or the NCM.Fault diagnosis
The ALFA CODE function allows self-diagnosis to be carried out for system components.The NBC is capable of identifying and memorizing the presence of the following malfunctions in its EEPROM:Transponder:- defective or missing transponder or secret code incorrect- deleted/disabled- unknown/not memorizedTransponder aerial:- electrical connection defective (circuit open, short circuit to earth or to battery)ALARM SYSTEM
The alarm system performs:- perimeter surveillance,- volumetric surveillance,- anti-tilt surveillance,- surveillance of supply lead cutting.System operation is co-ordinated by the Body Computer, wihch sends/receives commands from external modules via the serial line.The system is turned on/off by means of a remote control interfaced witha receiver in the NBC, the remote control unit and the receiver are radio controlled.The doors are locked upon insertion.To exclude the alarm completely (for example, in the case of a long period of inactivity for the vehicle) the vehicle should be closed by turning the metal insert in the key in the lock without using the remote control.The volumetric and anti-tilt protection can be excluded by operating a button in the front courtesy light.Every break in attempt is signalled by the code warning light in the instrument panel coming on together with a message shown in the display.The control unit is equipped with a self-diagnostic function which detects and memorises faults and problems in the control unit and system components; in addition, it checks the condition of the connecting cables and saves the number of activations and times the alarm has been operated.The control unit operating logic can be modified in order to satisfy the legal requirements which govern the use of alarm systems in the various markets.DIRECT INPUTS:| ... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ... |
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