PROTECTION CODES

The protection codes used by BCN and ECN are given below

UNIVERSAL CODE: this is the code which the ALFA CODE, not yet programmed, sends to the ECN when it has recognised the presence of a transponder in the key.

The ALFA CODE warning light comes on at a frequency of 1.6 Hz and duty cycle of 50%.

The flashing of the light explains that the system is correctly connected and working, but the car is not protected by a code.

IMMO CODE: This is the basic code from which the secret code and fix code are obtained. An automatically generated immmo code is associated with each car. All the other secret codes used by the ALFA CODE function are generated from the immo code.

SECRET CODE: This is the code resident in the transponder. It is memorised in the transponders contained in the car keys at the time of programming the transponders, and in the ALFA CODE at the time of programming the keys at the end of the line.

FIX CODE: This is memorised in the ALFA CODE at the time of end-of-line programming.

ELECTRONIC CODE (PIN): This is obtained from the fix code and is stamped on the CODE CARD which is delivered to the car's owner; it is a 5-digit decimal code (0 is not permitted).

It is used to access, in a protected manner, the BCN memory in order to re-programme or programme new remote control keys and/or carry out particular diagnostic functions.

It is also used in the procedure of recovery from accelerator pedal described in the engine control unit specification.

IDENTIFIER: It is resident in the transponder and is different for each transponder. It is memorised in the ALFA CODE during the programming procedure. The ALFA CODE manages a table of enabled identifications and one for disabled identifications.