BMW 01 41 0 155 307, Owner'S Manual

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Index
Data
Technology
Repairs
Car care
Controls
Overview
Electronic vehicle immobilizer
The key to security
Your BMW is equipped with a passive
anti-theft system. This electronic immo-
bilization system reduces the likelihood
of your vehicle being stolen by making
it impossible to start the engine using
any keys other than the ones furnished
with the vehicle. Your BMW center can
cancel the electronic system authoriza-
tion for individual keys (in the event of
loss, for instance). A deactivated key
can no longer be used to start the
engine.
46cde060
How the electronics work
At the heart of this system is an elec-
tronic chip that is integrated into the
key. The lock mechanism itself is actu-
ally a dual-function device. While the
engine is running, the circuitry in the
ignition key and the vehicle's electronic
system constantly exchange variable,
vehicle-specific signals. The system will
not release the ignition, fuel injection
and starter unless it recognizes an
"authorized" key.
Force applied to the key can
damage the integrated electronic
circuitry. A damaged key can no longer
be used to start the engine.
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