Immobilizer System - Subaru LEGACY 2002 Quick Reference Index

IMMOBILIZER SYSTEM

Security and Locks
4. Immobilizer System
A: CONSTRUCTION
The immobilizer system consists of the following components: an indicator light in the combination
meter, an immobilizer control module (IMM ECM), an engine control module (ECM), a transponder
inside the ignition key, and an antenna fitted to the key cylinder.
The antenna receives a vehicle ID code emitted from the transponder when the key is inserted into
the key cylinder.
The ID code is transmitted to the IMM ECM. The IMM ECM compares the code with a one that
has been registered in it. If these ID codes match with each other, the system allows the engine
to be started. If they do not match but the key fits in, turning the key may be able to start the engine.
The engine, however, will automatically stop after a few seconds.
The immobilizer function is activated automatically when the key is removed from the key cylinder
and when 60 seconds have passed after the ignition switch was turned to the "ACC" or "OFF" po-
sition. When the function is activated, the indicator light flashes at intervals of 0.2-second ON and
2.8-second OFF.
This indicator light flashing indicates that the system is ready to function if an action of theft is at-
tempted.
In the event that the immobilizer system develops a fault, the immobilizer indicator light illuminates
when the ignition switch is turned to the "ON" position.
NF0278
SL-5