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out by qualified technicians only. Contact an
authorized Mercedes-Benz Center for further
information.
The electro-hydraulic brake system must be
deactivated prior to working on the system.
High pressure is intermittently built up in the
system as part of its automatic self-test.
In addition, the system is automatically
activated when the vehicle is unlocked by
remote control, when the driver or passenger
door is opened, when the SmartKey in the
starter switch is turned to position 1 or the
KEYLESS-GO start/stop button is pressed
once, when the brake pedal is depressed or
when the parking brake is released. Failure to
deactivate the system prior to maintenance
will cause brake pistons to extend and brake
fluid to leak, which may result in injuries
(contusions and acid burns). Extended brake
pistons may also cause injury.
The electro-hydraulic brake system switches
off automatically
R
approximately 2 minutes after you turned
the SmartKey in the starter switch to
position 0 or removed the SmartKey
R
approximately 2 minutes after you pressed
the KEYLESS-GO start/stop button to turn
off the engine or power supply and opened
the driver’s door (with driver’s door open,
the starter switch is set to position 0, same
as SmartKey removed from starter switch)
R
approximately 20 seconds after you locked
the vehicle from outside
For more information on your vehicle’s
brakes, see the “Driving instructions” section
(Y page 210).
Anti-theft systems
Immobilizer
The immobilizer prevents unauthorized
persons from starting your vehicle.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. The
engine can be started by anyone with a valid
SmartKey that is left inside the vehicle.
Activating
X
With SmartKey: Remove the SmartKey
from the starter switch.
X
With KEYLESS-GO: Turn off the engine and
open the driver’s door.
Deactivating
X
Switch on the ignition.
i
Starting the engine will also deactivate
the immobilizer.
In the event that 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 1-800-387-0100 (in Canada).
Anti-theft alarm system
Once the alarm system has been armed, a
visual and audible alarm is triggered when
someone opens
R
a door
R
the trunk
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the hood
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a storage compartment in the rear
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the glove box
R
the storage compartment under the
armrest
The alarm will stay on even if the activating
element, a door, for example, is closed
immediately.
The alarm system will also be triggered when
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the vehicle is raised (tow-away alarm)
R
the vehicle is opened with the mechanical
key
Anti-theft systems
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Safety and security
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