RT-3 USER GUIDE____________________________________________________
3.2
VAG INMOBILIZER
3.2.1 INTRODUCTION
The market’s present requirements have promoted the introduction of electronic
systems to avoid or difficult the vehicles´ robbery. These systems protect from igniting the
vehicle by unauthorized people by means of a key recognition electronic system and codified
ECUs.
3.2.2 ELEMENTS
The associated components to the inmobilize system of SEAT /AUDI / VW/ SKODA are:
Inmobilizer´s ECU: is the heart of the system and takes care of the recognition of both
the authorized ignition key and injection ECU, allowing or not the vehicle ignition.
Codified keys: The immobilizer ECU is able to recognize up to EIGHT keys.
Transponder key reader: Radiofrequency emitter device that can read the keys´ stored
codes.
3.2.3 CHECK UP
There is a dialog through an interconnection channel between the injection ECU and the
immobilizer ECU ( W channel), to allow or not the vehicles´ ignition. This protection is
implemented at two levels; so, there are two conditions to be fulfilled for the authorization to
take place:
1.
2.
The immobilizer´s ECU is programmed to allow the starting only with the previously
right coded injection ECU. That means that in case of an ECU substitution, the
immobilizer has to be programmed to recognize the new injection ECU.
The immobilizer authorizes to start only if the key’s code has already been stored by
the system ECU. That means that in case the customer needed a new key, this should
be recognized and memorized by the immobilizer.
3.2.4 OPERATION
The steps done by the ECU before authorizing the ignition are the following:
The user enters the key and turns it on. Each key has a chip that emits a code when
excited by a radio-frequency signal. That signal is emitted from the ignition lock
cylinder when the contact has been done, then, a sensor reads the key’s emitted code.
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