
G
Risk of accident
If, in a critical driving situation, you do not
receive a visual and acoustic warning:
R PRE-SAFE ®
Brake did not detect the risk of
a collision
R PRE-SAFE ®
Brake is switched off
R PRE-SAFE ®
Brake has failed
You must then brake to avoid a collision.
X To activate: activate PRE-SAFE ®
Brake in
the on-board computer (Y page 130).
The Ä symbol appears in the lower
multi-function display, as long as the HOLD
function is not activated (Y page 151).
On vehicles with parking guidance*, drive
range Pmust be engaged for the symbol to
be displayed.
The radar sensors are automatically deacti-
vated in the vicinity of radio telescope facili-
ties (Y page 362).
For PRE-SAFE ®
Brake to assist you when driv-
ing, the radar sensor system must be
switched on and operational.
PRE-SAFE ®
Brake does not always detect
complex traffic situations properly. You can
terminate the braking action of PRE-SAFE ®
Brake in a non-critical driving situation at any
time if:
R an acoustic and visual warning occurs
R the vehicle brakes
To end this you can either depress the accel-
erator pedal further, activate kickdown or
release the brake pedal.
The braking action of PRE-SAFE ®
Brake is
ended automatically if:
R you manoeuvre to avoid the obstacle.
R you drive slower than approximately
15 km/h.
R there is no longer an obstacle detected in
front of your vehicle.
R there is no longer any danger of a collision. Following a collision or crash-related damage
to the front end of the vehicle, have the con-
figuration and operation of the radar sensors
checked. Choose a qualified specialist work-
shop for this which has the necessary spe-
cialist knowledge and tools for the work
required. Mercedes-Benz recommends that
you use a Mercedes-Benz Service Centre for
this purpose.
Anti-theft systems
Immobiliser
The immobiliser prevents your vehicle from
being started without the correct key.
Activating the immobiliser X
With the key: remove the key from the
ignition lock.
X With KEYLESS GO*: press the start/stop
button on the dashboard.
The engine switches off.
Deactivating the immobiliser X
With the key: turn the key to position 2in
the ignition lock.
X With KEYLESS GO*: press the start/stop
button on the dashboard twice without
depressing the brake.
i The immobiliser is always deactivated
when you start the engine. ATA* (anti-theft alarm system)
A visual and audible alarm is triggered when
the alarm system is primed and you open:
R a door
R a door or the boot lid with the emergency
key element
R the boot lid/tailgate
R the bonnet Anti-theft systems
65Safety
* optional
212_AKB; 2; 4, en-GB
mkalafa
,V ersion: 2.11.8.1
2009-05-05T14:17:16+02:00 - Seite 65 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:44; WK 

The alarm is not switched off even if you close
a door again. X
To prime: lock the vehicle using the key.
Vehicles with KEYLESS GO* can also be
locked by touching the door handle on the
outside.
Indicator lamp :flashes. The alarm sys-
tem is primed after approximately 15 sec-
onds.
X To deactivate: unlock the vehicle using the
key. Vehicles with KEYLESS GO* can also
be unlocked by opening the door/boot lid/
tailgate.
Deactivating the alarm X
With the key: insert the key into the igni-
tion lock.
The alarm is deactivated.
or
X Press the %or& button on the key.
The alarm is deactivated.
X With KEYLESS GO*: grasp the outside
door handle. The key must be outside the
vehicle.
The alarm is deactivated.
or
X Press the Start/Stop button on the dash-
board. The key must be inside the vehicle.
The alarm is deactivated. Tow-away protection*
An audible and visual alarm is triggered if the
vehicle's angle of inclination is altered while
tow-away protection is primed. For example,
this occurs if the vehicle is jacked up on one
side.
Priming tow-away protection X
Lock the vehicle using the key. Vehicles
with KEYLESS GO* can also be locked by
touching the door handle on the outside.
Tow-away protection is primed after
approximately 30 seconds.
Deactivating tow-away protection When you unlock your vehicle using the key
or KEYLESS GO*, tow-away protection is
automatically deactivated.
Deactivate tow-away protection manually to
prevent a false alarm if your vehicle:
R is being transported
R is being loaded, e.g. onto a ferry or car
transporter
R is parked on a movable surface, e.g. split-
level garages 66
Anti-theft systemsSafety
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 66
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:44; WK 

X
Remove the key from the ignition lock.
X Press button :.
Indicator lamp ;lights up briefly.
X Lock the vehicle using the key. Vehicles
with KEYLESS GO* can also be locked by
touching the door handle on the outside.
Tow-away protection remains deactivated
until:
R
the vehicle is unlocked again.
R a door is opened and closed again.
R the vehicle is locked again. Interior motion sensor*
If the interior motion sensor is primed, a vis-
ual and audible alarm is triggered when move-
ment is detected in the vehicle interior while
the vehicle is locked. This occurs, for exam-
ple, if someone breaks the side windows of
your vehicle or reaches into the vehicle's inte-
rior.
Priming the interior motion sensor X
Make sure that:
R
the side windows are closed.
R the sliding/tilting sunroof* or panorama
sliding sunroof* is closed.
R there are no objects, e.g. mascots, hang-
ing on the rear-view mirror or on the roof
grab handles.
This will prevent false alarms.
X Lock the vehicle using the key. Vehicles
with KEYLESS GO* can also be locked by
touching the door handle on the outside.
The interior motion sensor is primed after
approximately 30 seconds.
Deactivating the interior motion sensor When you unlock your vehicle using the key
or KEYLESS GO*, the interior motion sensor
is automatically deactivated. To prevent a false alarm, deactivate the inte-
rior motion sensor if you lock your vehicle
and:
R
people or animals remain in the vehicle.
R the side windows remain open.
R the sliding/tilting sunroof* or panorama
sliding sunroof* remains opened. X
Remove the key from the ignition lock.
X Press button :.
Indicator lamp ;flashes briefly.
X Lock the vehicle using the key. Vehicles
with KEYLESS GO* can also be locked by
touching the door handle on the outside.
The interior motion sensor remains deacti-
vated until:
R the vehicle is unlocked again.
R a door is opened and closed again.
R the vehicle is locked again. Anti-theft systems
67Safety
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 67 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:45; WK 

Opening and closing
Key
The key centrally locks/unlocks:
R the doors
R the boot lid/tailgate
R the fuel filler flap G
Risk of accident
If children are left unsupervised in the vehicle,
they could:
R open a door from the inside at any time,
even if it has been locked
R start the vehicle using a key which has been
left in the vehicle
R release the parking brake
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time. :
& Locks the vehicle
; F Unlocks the boot lid/tailgate
= % Unlocks the vehicle
? Battery check lamp
When unlocking, the turn signals flash once.
When locking, they flash three times.
When it is dark, the surround lighting also
comes on if it is activated in the on-board
computer. If you do not open either a door or the boot
lid/tailgate after you have unlocked the vehi-
cle, it will automatically relock. The time until
it locks is approximately 40 seconds.
KEYLESS GO* You can start, lock or unlock the vehicle using
the KEYLESS GO key. To do this, you only
need carry the key with you. When you touch
the surface of the sensors on the vehicle's
door handles, KEYLESS GO establishes a
radio connection between the vehicle and the
key.
The distance to the door handle from which
you wish to lock or unlock the vehicle must
not be greater than 1 m.
When starting the engine and whilst driving,
KEYLESS GO also checks whether a valid key
is in the vehicle by periodically establishing
radio contact. X
To unlock the vehicle: touch the inner
surface of the door handle.
X To lock the vehicle: touch sensor sur-
face :.
If you pull on the handle of the boot lid/tail-
gate, only the boot/luggage compartment of
the vehicle is unlocked.
i If the vehicle has been parked for a long
time, the sensor surfaces are deactivated
automatically.
Pull on the door handle to unlock the door
and switch on the ignition once to reacti-
vate the sensors. 70
Opening and closingControls
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 70
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:46; WK 

Individual settings
You can change the setting of the locking
system in such a way that only the driver's
door and the fuel filler flap are unlocked. This
could be useful if you frequently travel on your
own.
X To change the setting: press the%
and & buttons simultaneously for
approximately six seconds until the battery
check lamp flashes twice.
The key now functions as follows:
X To unlock the driver's door: press the
% button once.
X To unlock centrally: press the%but-
ton twice.
X To lock centrally: press the&button.
The KEYLESS GO* function is changed as fol-
lows:
X To unlock the driver's door: touch the
inner surface of the door handle on the
driver's door.
X To unlock centrally: touch the inner sur-
face of the door handle on the front-
passenger door or the rear door.
X To lock centrally: touch sensor sur-
face :on one of the door handles.
Restoring the factory settings X
Press the %and& buttons simulta-
neously for approximately six seconds until
the battery check lamp flashes twice.
Additional information R
Convenience opening (Y page 102)
R Convenience closing (Y page 102)
R Opening and closing in an emergency
(Y page 299) Opening the doors from the inside
You can open a door from the inside even if it
has been locked, unless the child-proof locks
have been activated ( Ypage 57). X
Pull door handle ;.
If the door is locked, locking knob :pops
up. The door is unlocked and can be
opened. Locking/unlocking the vehicle from
the inside
You can centrally lock or unlock the vehicle
from the inside. This feature may be useful if,
for example, you wish to unlock the front-
passenger door from the inside or lock the
vehicle before you pull away. G
Risk of accident
Do not leave children unsupervised in the
vehicle. They could open a door from the
inside – even if it is locked – and thereby
endanger themselves and others. Opening and closing
71Controls
* optional
212_AKB; 2; 4, en-GB
mkalafa
,V ersion: 2.11.8.1
2009-05-05T14:17:16+02:00 - Seite 71 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:46; WK 

Key positions
Key
g
To remove the key
1 Power supply for some consumers, such
as the windscreen wipers
2 Ignition (power supply for all consumers)
and drive position
3 To start the engine
i Even if the key is not for the vehicle in
question, it will still turn in the ignition lock.
The ignition is not switched on. The engine
cannot be started. KEYLESS GO*
If you press the Start/Stop button repeatedly
without depressing the brake pedal, its func-
tion corresponds to the different key posi-
tions in the ignition lock.
If you depress the brake pedal and press the
Start/Stop button, the engine starts immedi-
ately. X
Position 0: if Start/Stop button :has not
yet been pressed, this corresponds to "key
removed".
X Position 1: press Start/Stop button :
once.
It is now possible to switch on the wind-
screen wipers, for example.
i If you open the driver's door in this posi-
tion, the power supply is disconnected
again.
X Position 2(ignition): press Start/Stop but-
ton :twice.
i If you press Start/Stop button :in this
position once and the driver's door is open,
the power supply is disconnected again.
Removing the Start/Stop button You can remove the Start/Stop button from
the ignition lock and start the vehicle with a
key as usual.
i You do not need to remove the Start/
Stop button from the ignition lock when you
leave the vehicle. X
Remove Start/Stop button :from ignition
lock ;.
i If you switch from key mode to KEYLESS
GO mode, the system requires a two-sec-
ond recognition period before you can use
the Start/Stop button. Key positions
75Controls
* optional
212_AKB; 2; 4, en-GB
mkalafa
,V ersion: 2.11.8.1
2009-05-05T14:17:16+02:00 - Seite 75 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:49; WK 

Seat cushion angle
Adjust the angle so that your thighs are gently
supported.
X Slide the button up or down in the direction
of arrow ;.
Head restraint height X
Slide the button up or down in the direction
of arrow :.
Head restraint angle X
Push or pull the lower edge of the head
restraint in the direction of the arrow. Lumbar support
The lumbar support for the driver's seat can
be adjusted to provide optimum support for
your back. X
Move adjustment lever :in the direction
of the arrow until the desired backrest con-
tour is achieved. Four-way lumbar support*
You can adjust the contour of the front seat
backrests individually to provide optimum
support for your back. :
To raise the backrest contour
; To soften the backrest contour
= To lower the backrest contour
? To harden the backrest contour
i When the door is unlocked, opened or the
key is in position 1in the ignition lock, the
setting of the lumbar support is automati-
cally checked and, if necessary, the indi-
vidual setting is restored. 78
SeatsControls
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 78
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:51; WK 

Adjusting the steering wheel electri-
cally*
:
Height adjustment
; Fore-and-aft adjustment
You can find more information under:
R EASY-ENTRY/EXIT feature (Y page 85)
R storing settings (Y page 87) Steering wheel heating*
X
To switch on or off: make sure that the
key is in position 2in the ignition lock.
X Turn the lever in direction of arrow :
or ;.
Indicator lamp =lights up or goes out.
i The steering-wheel heating does not
switch off automatically. Easy-entry/exit feature*
The EASY-ENTRY/EXIT feature makes getting
in and out of your vehicle easier.
The steering wheel swings upwards when
you:
R remove the key from the ignition lock
R open the driver's door when the key is in
position 0or 1in the ignition lock
When the key is inserted into the ignition lock
with the driver's door closed, the steering
wheel is automatically moved to the previ-
ously set position. G
Risk of injury
Make sure that nobody can become trapped
when you activate the EASY-ENTRY/EXIT fea-
ture.
If there is a risk of someone becoming trap-
ped, stop the adjustment procedure. To halt
the procedure:
R move the steering column adjustment
switch in the opposite direction to that in
which the steering wheel is moving
R press one of the memory function position
buttons
Never leave children unsupervised in the vehi-
cle. They could open the driver's door and,
thereby, unintentionally activate the EASY-
ENTRY feature and become trapped.
The last position of the steering wheel is
stored after you manually adjust it or when
you store a memory position (Y page 87).
You can activate and deactivate the EASY-
ENTRY/EXIT feature via the on-board com-
puter (Y page 136).
i The crash-responsive EASY-EXIT fea-
ture* can only be activated after an acci-
dent if the EASY-ENTRY/EXIT feature is
activated in the on-board computer.
If the crash-responsive EASY-EXIT feature
is triggered in an accident, the steering
wheel column will move upwards when the
driver's door is opened, irrespective of the Steering wheel
85Controls
* optional
212_AKB; 2; 4, en-GB
mkalafa
,V ersion: 2.11.8.1
2009-05-05T14:17:16+02:00 - Seite 85 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:15:55; WK