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June 2013
Electrical Systems Operation & Diagnosis Module (602)
Immobilizer Type A
System Construction
The Subaru Immobilizer is designed to prevent
unauthorized people from operating the vehicle.
This is accomplished by the use of a coded
transponder key that reacts with the Body
Integrated Unit (BIU), Engine Control Module
(ECM) and the Combination meter.
The Immobilizer almost simultaneously checks
the key, BIU, combination meter and Engine
Control Module to see if they are all part of a
matched set. If any one part does not match,
the vehicle becomes inoperable.
The Immobilizer is not a security system.
However the vehicle is wired to accept the
addition of the components needed to install
the security system.
Note: The installed items must be
programmed into the BIU using
the Subaru Select Monitor III.
Key
The key contains the transponder which consists
of an antenna, capacitor and integrated circuit.
Transponder (ARTWORK)
Ignition switch
When the key is placed into the ignition a signal
from the key warning switch activates the BIU
to send a high frequency electric wave to the
antenna coil surrounding the ignition switch.
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