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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 is designed to reduce
the susceptibility of your vehicle to theft
by making it impossible to start the en-
gine using any means other than the
special keys furnished with the vehicle.
Your BMW center can cancel the elec-
tronic system authorization for individ-
ual keys (in the event of loss, for in-
stance). A deactivated key can no
longer be used to start the engine.
520de148
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, simulta-
neously serving as a communications
interface designed to allow the security
system to maintain a continuous stream
of variable, vehicle-specific signals with
the electronic circuitry in the key. The
system will release the ignition, electri-
cal steering lock, fuel injection and
starter for use only if it detects an
"authorized" key.
Forcing the key can damage the
integrated electronic circuitry. A
damaged key can no longer be used to
unlock the steering column and start
the engine.<
Online Edition for Part No. 01 41 0 155 083 - © 03/00 BMW AG
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