Antitheft and Alarm Systems: Description and Operation

IMMOBILIZER SYSTEM

The engine immobilizer system consists of the ignition key, the key ring antenna, the ETACS-ECU (immobilizer-ECU), and the powertrain control module (PCM). It has these functions:
The system is designed to be maintenance-free because the power source for the transponder is supplied by the ETACS-ECU (immobilizer-ECU) via the key ring antenna. Two ignition keys are provided, and up to eight keys can be registered to one vehicle (one receiver) as needed. There are 4 billion combinations for the encrypted code. In addition, one part of the code is changed each time the key is switched on, which improves security by preventing theft using a copied encrypted code.






OPERATION
With the ignition switch "ON" position, the immobilizer system operates as follows.