Mercedes-Benz SLR McLaren. Operator's Manual.

Safety and Security
Anti-theft systems
Immobilizer
The immobilizer prevents unauthorized
persons from starting your vehicle.
Activating
Removing the SmartKey from the starter
switch activates the immobilizer.
Deactivating
Inserting the SmartKey in the starter
switch deactivates the immobilizer.
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In case the engine cannot be started
(yet the vehicle’s battery is charged),
the system is not operational. Contact
an authorized Mercedes-Benz Center
or call 1-800-FOR-MERCedes (in the
USA), or 1-888-881-6611 (in Canada).
Anti-theft alarm system
Once the alarm system has been armed, a
visual and audible alarm is triggered when
someone opens
a door
the trunk
the hood
a storage compartment in the rear
the storage compartment under the
armrest.
The alarm system will also be triggered
when
someone attempts to raise the vehicle
someone opens a door from the inside
if the vehicle was locked with the
SmartKey
someone opens the trunk with the
emergency release button
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The alarm will stay on, even if the activating
element (a door, for example) is
immediately closed.
If the alarm stays on for more than
30 seconds, a call to the Response
Center is initiated automatically by the
Tele Aid system ( page 215) provided
Tele Aid service was subscribed to and
properly activated, and that necessary
cellular service and GPS coverage are
available.