
R
to crossing traffic
R when cornering
As 
a result, BAS PLUS may not intervene in all
critical situations. There is a risk of an
accident.
Always pay careful attention to the traffic
situation and be ready to brake.
Following damage to the front end of the
vehicle, have the configuration and operation
of the radar sensors checked at a qualified
specialist workshop. This also applies to
collisions at low speeds where there is no
visible damage to the front of the vehicle.
i This device has been approved by the FCC
as a "Vehicular Radar System". The radar
sensor is intended for use in an automotive
radar system only. Removing, altering or
tampering with the device will void any
warranties, and is not permitted by the
FCC. Do not tamper with, alter, or use the
device in any non-approved way.
Any unauthorized modification to this
device could void the user's authority to
operate the equipment. ESP
®
 (Electronic Stability Program)
Important safety notes i
Observe the "Important safety notes"
section ( Y page 64).G
WARNING
If ESP ®
 is malfunctioning, ESP ®
 is unable to
stabilize the vehicle. Additionally, further
driving safety systems are deactivated. This
increases 
the risk of skidding and an accident.
Drive on carefully. Have ESP ®
 checked at a
qualified specialist workshop.
!  Vehicles with 4MATIC: switch off the
ignition when the parking brake is being
tested on a brake dynamometer.
Application of the brakes by ESP ®
 may
otherwise destroy the brake system. Vehicles without 4MATIC: when towing your
vehicle with the rear axle raised, it is
important that you observe the notes on
ESP
®
(Y page 316).
ESP ®
 
is deactivated if the  å warning lamp
in the instrument cluster lights up
continuously when the engine is running.
If the  ÷ warning lamp and the  å
warning lamp are lit continuously, ESP ®
 is not
available due to a malfunction.
Observe the information on warning lamps
(Y page 259) and display messages which
may be shown in the instrument cluster
(Y page 229).
If ESP ®
 detects that the vehicle is deviating
from the direction desired by the driver, one
or more wheels are braked to stabilize the
vehicle. The engine output is also modified to
keep the vehicle on the desired course within
physical limits. ESP ®
 assists the driver when
pulling away on wet or slippery roads. ESP ®
can also stabilize the vehicle during braking.
If ESP ®
 intervenes, the  ÷ ESP®
 warning
lamp flashes in the instrument cluster.
If ESP ®
 intervenes:
X Do not deactivate ESP ®
 under any
circumstances.
X Only depress the accelerator pedal as far
as necessary when pulling away.
X Adapt your driving style to suit the
prevailing road and weather conditions.
i Only use wheels with the recommended
tire sizes. Only then will ESP ®
 function
properly.
ETS/4ETS (Electronic Traction System) Traction control is part of ESP
®
.
Traction control brakes the drive wheels
individually if they spin. This enables you to
pull 
away and accelerate on slippery surfaces,
for example if the road surface is slippery on
one side. On vehicles with 4MATIC, more 66
Driving safety systems
Safety 

drive torque is also transferred to the wheel
or wheels with traction.
Traction control remains active if you
deactivate ESP
®
.
Deactivating/activating ESP ®G
WARNING
If you deactivate ESP ®
, ESP ®
 no longer
stabilizes the vehicle. There is an increased
risk of skidding and an accident.
Only deactivate ESP ®
 in the situations
described in the following.
!  Avoid spinning the driven wheels for an
extended period with ESP ®
 deactivated.
You 
could otherwise damage the drivetrain.
X To deactivate:  (Y page 222).
The å ESP ®
 OFF warning lamp in the
instrument cluster lights up.
X To activate:  (Y page 222).
The å ESP ®
 OFF warning lamp in the
instrument cluster goes out.
ESP ®
 is activated automatically when the
engine is started.
The ECO start/stop function switches the
engine off automatically if the vehicle stops
moving. 
The engine starts automatically when
the driver wants to pull away again. ESP ®
remains in its previously selected status.
Example: if ESP ®
 was deactivated before the
engine was switched off, ESP ®
 remains
deactivated when the engine is switched on
again.
If ESP ®
 is deactivated and one or more wheels
start to spin, the  ÷ ESP®
 warning lamp in
the instrument cluster flashes. In such
situations, ESP ®
 will not stabilize the vehicle.
It may be best to deactivate ESP ®
 in the
following situations:
R when using snow chains
R in deep snow
R on sand or gravel If you deactivate ESP
®
:
R ESP ®
 no longer improves driving stability.
R traction control is still activated.
R ESP ®
 still provides support when you
brake.
R engine torque is not limited and the drive
wheels are able to spin. The spinning
wheels produce a cutting effect for better
traction. EBD (electronic brake force
distribution)
i Observe the "Important safety notes"
section ( Y page 64). G
WARNING
If EBD has malfunctioned, the rear wheels can
still lock, e.g. under full braking. This
increases 
the risk of skidding and an accident.
You should therefore adapt your driving style
to the different handling characteristics. Have
the brake system checked at a qualified
specialist workshop.
Observe information regarding indicator and
warning lamps ( Y page 258) as well as
display messages ( Y page 230).
EBD monitors and controls the brake
pressure on the rear wheels to improve
driving stability while braking. ADAPTIVE BRAKE
ADAPTIVE BRAKE enhances braking safety
and offers increased braking comfort. In
addition to the braking function, ADAPTIVE
BRAKE also has the HOLD function
(Y page 189) and hill start assist
(Y page 153). PRE-SAFE
®
 Brake
i Observe the "Important safety notes"
section ( Y page 64). Driving safety systems
67
Safety Z 

Always pay particular attention to the traffic
situation and be ready to brake, especially if
PRE-SAFE
®
 Brake warns you. Terminate the
intervention 
in a non-critical driving situation.
In particular, the detection of obstacles can
be impaired if there is:
R dirt on the sensors or anything else
covering the sensors
R snow or heavy rain
R interference by other radar sources
R the possibility of strong radar reflections,
for example in parking garages
R a narrow vehicle traveling in front, e.g. a
motorbike
R a vehicle traveling in front on a different line
relative to the center of your vehicle G
WARNING
PRE-SAFE ®
 Brake does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering
As a result, PRE-SAFE ®
 Brake may neither
give warnings nor intervene in all critical
situations. There is a risk of an accident.
Always pay careful attention to the traffic
situation and be ready to brake.
In 
order to maintain the appropriate distance
to the vehicle in front and thus prevent a
collision, you must apply the brakes yourself.
X To activate/deactivate:  activate or
deactivate PRE-SAFE ®
 Brake in the on-
board computer ( Y page 222).
When PRE-SAFE ®
 Brake is activated, the
Ä symbol appears in the multifunction
display, as long as the HOLD function is
deactivated (Y 
page 189). On vehicles with
the Active Parking Assist driving system,
the  Ä symbol is displayed when position
P is engaged or you are driving faster than
22 mph (35 km/h). For PRE-SAFE
®
 Brake to assist you when
driving, the radar sensor system must be
switched on (Y page 226) and be
operational.
Following damage to the front end of the
vehicle, 
have the configuration and operation
of the radar sensors checked at a qualified
specialist workshop. This also applies to
collisions at low speeds where there is no
visible damage to the front of the vehicle.
i USA only: This device has been approved
by the FCC as a "Vehicular Radar System".
The radar sensor is intended for use in an
automotive radar system only. Removing,
altering or tampering with the device will
void any warranties, and is not permitted
by the FCC. Do not tamper with, alter, or
use the device in any non-approved way.
Any unauthorized modification to this
device could void the user's authority to
operate the equipment.
i Canada only: This device complies with
RSS-210 of Industry Canada. Operation is
subject to the following two conditions:
1. This device may not cause interference,
and
2. this device must accept any interference
received, including interference that may
cause undesired operation of the device.
Removal, tampering, or altering of the
device will void any warranties, and is not
permitted. Do not tamper with, alter, or use
the device in any non-approved way.
Any unauthorized modification to this
device could void the user's authority to
operate the equipment. Driving safety systems
69
Safety Z 

The Product label with FCC ID and IC
certification number can be found in the
battery case of the SmartKey.
R Do not keep the SmartKey:
-with electronic devices, e.g. a mobile
phone or another SmartKey
- with 
metallic objects, e.g. coins or metal
foil
- inside metallic objects, e.g. a metal case
This can affect the SmartKey's
functionality.
Keep the SmartKey away from strong
magnetic fields. Otherwise, the remote
control function could be affected. SmartKey functions
:
& To lock the vehicle
; F To unlock the trunk lid
= % To unlock the vehicle
X To unlock centrally:  press the %
button.
If you do not open the vehicle within
approximately 
40 seconds of unlocking:
R the vehicle is locked again.
R the theft deterrent locking system is
armed again.
X To lock centrally:  press the & button.
The SmartKey centrally locks/unlocks:
R the doors
R the trunk lid
R the fuel filler flap When unlocking, the turn signals flash once.
When locking, they flash three times.
You 
can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated using
the on-board computer (Y page 226).
When it is dark, the surround lighting also
comes on if it is activated in the on-board
computer (Y page 225). KEYLESS-GO
General notes Bear in mind that the engine can be started
by any of the vehicle occupants if there is a
KEYLESS-GO key in the vehicle.
Locking and unlocking centrally
You can start, lock or unlock the vehicle using
KEYLESS-GO. 
To do this, you only need carry
the SmartKey with you. When you touch the
surface of the sensors on the vehicle's
outside door handles, KEYLESS-GO
establishes a radio connection between the
vehicle and the SmartKey. When the engine
is started and whilst you are driving,
KEYLESS-GO also checks whether a valid
SmartKey is in the vehicle by periodically
establishing radio contact.
You can combine the KEYLESS-GO functions
with those of a conventional key, e.g. using
KEYLESS-GO to unlock and pressing the
& button to lock.
When locking or unlocking with KEYLESS-GO,
the distance between the SmartKey and the
corresponding door handle must not be
greater than 3 ft (1 m). SmartKey
73
Opening/closing Z   

G
WARNING
Do not carry heavy or hard objects in the
passenger  compartment or trunk unless they
are firmly secured in place.
Unsecured or improperly positioned cargo
increases a child's risk of injury in the event
of
R strong braking maneuvers
R sudden changes of direction
R an accident
!  The trunk lid swings upwards when
opened. Therefore, make sure that there is
sufficient clearance above the trunk lid.
i Opening dimensions of the trunk lid
(Y page 367).
Do not leave the SmartKey in the trunk. You
could otherwise lock yourself out.
The trunk lid can be:
R opened and closed manually from outside
R opened automatically from outside
R opened automatically from inside
R locked separately
R opened with the emergency release button
R unlocked with the mechanical key Opening/closing from outside
Opening X
Press the % button on the SmartKey.
X Pull handle  :.
X Raise the trunk lid.
Closing G
WARNING
To prevent possible personal injury, always
keep hands and fingers away from the trunk
opening when closing the trunk lid. Be
especially careful when small children are
around. X
Pull the trunk lid down using recess  :.
X If necessary, lock the vehicle with
the & button on the SmartKey
(Y page 73) or with KEYLESS-GO
(Y page 73).
i If a KEYLESS-GO key is detected in the
trunk, the trunk lid cannot be locked and
then opens again. Opening automatically from the
outside
Important safety notes G
WARNING
Make sure the trunk lid is closed when the
engine is running and while driving. Among
other dangers, deadly carbon monoxide (CO)
gases 
may enter the vehicle interior resulting
in unconsciousness and death. 82
Trunk
Opening/closing     

1
Neutral position.
2 To unlock
X Turn the mechanical key counter-clockwise
from position 1 as far as it will go to
position 2. Simultaneously pull the trunk
lid handle.
The trunk is unlocked.
X Turn the mechanical key back to position
1 and remove it.
X Insert the mechanical key into the
SmartKey. Trunk emergency release
You can open the trunk lid from inside the
vehicle with the emergency release button. X
Press emergency release button  :  briefly.
The trunk lid unlocks and opens.
The trunk lid can be unlocked and opened
with the trunk lid emergency release when
the vehicle is stationary or while driving. The trunk lid emergency release does not
open the trunk lid if the battery is
disconnected or discharged.
Trunk lid emergency release light:
R
emergency release button : flashes for
30 minutes after the trunk lid is opened
R emergency release button : flashes for
60 minutes after the trunk lid is closed Side windows
Important safety notes
G
WARNING
When opening or closing the door windows,
make sure that there is no danger of anyone
being harmed by the opening/closing
procedure.
The front door windows are equipped with
automatic 
operation and the anti-entrapment
feature. If in automatic mode a front door
window encounters an obstruction that
blocks its path, the anti-entrapment feature
will stop the door window and open it slightly.
The door windows operate differently when
the switch is pulled. See the "Problems with
door windows" section for details.
The closing of the front door windows can be
immediately halted by releasing the switch or,
if the switch was pulled past the resistance
point and released, by either pressing or
pulling the respective switch.
The closing of the rear side windows can be
immediately halted by releasing the switch.
Activate the override switch when children
are riding in the back seats of the vehicle. The
children may otherwise injure themselves,
e.g. by becoming trapped in the door window
opening. G
WARNING
Do not keep any part of your body up against
the 
 window pane when opening a window. The
downward motion of the pane may pull that
part of your body down between the window 84
Side windows
Opening/closing     

pane and the door frame and trap it there. If
there is a risk of entrapment, release the
switch and pull it to close the window.
Opening and closing the side
windows
The 
switches for all side windows are located
on the driver's door. There is also a switch on
the front-passenger door as well as on the
doors in the rear compartment on the left and
right-hand sides for the respective side
window.
The switches on the driver's door take
precedence. :
Front left
; Front right
= Rear right
? Rear left
X Turn the SmartKey to position  1 
 or 2 in the
ignition lock.
X To open: press the corresponding switch.
X To close:  pull the corresponding switch.
i You can start automatic operation when
opening 
and closing the front door windows
and when opening the rear door windows.
To do so, briefly press or pull the switch to
beyond the point of resistance in the
relevant direction. You can stop automatic
operation by pressing or pulling again.
i You can continue to operate the side
windows after you switch off the engine or
remove the SmartKey. This function is available for up to five minutes or until the
driver's 
or front-passenger door is opened.
i When the override feature for the side
windows is activated ( Y page 63), the side
windows cannot be operated from the rear. Opening and closing all side windows
(Cabriolet)
Using the switch on the center console You can use the button on the center console
to close all side windows simultaneously.
X
Open the cover in the lower center console.
The 
switch for all side windows is under the
cover. X
To open all side windows:  press
switch : to the point of resistance.
X To open all side windows fully:  press
switch : beyond the point of resistance.
X To close all side windows:  pull
switch :.
Using the SmartKey G
WARNING
Make sure that nobody can become trapped
as you close the side windows.
Proceed as follows if there is a risk of
entrapment:
R release the  & key.
R press and hold the  % key until the side
windows open again. Side windows
85
Opening/closing Z     

X
Touch recessed sensor surface  : on the
door  handle until the side windows and the
panorama roof with power tilt/sliding
panel are fully closed.
i Make sure you only touch recessed
sensor surface :.
X Make sure that all the side windows and the
panorama roof with power tilt/sliding
panel are closed.
On vehicles with a panorama roof with power
tilt/sliding panel:
X Touch recessed sensor surface  : on the
door handle again until the roller sunblind
of the panorama roof with power tilt/
sliding panel closes.
X To interrupt convenience closing: 
release 
recessed sensor surface  : on the
door handle. Resetting the side windows
If 
 a side window can no longer be closed fully,
you must reset it.
X Close all the doors.
X Turn the SmartKey to position  1 
 or 2 in the
ignition lock.
X Pull the corresponding switch on the door
control panel until the side window is
completely closed 
(Y page 85).
X Hold the switch for an additional second.
If the side window opens again slightly:
X Immediately pull the corresponding switch
on the door control panel until the side
window is completely closed 
(Y page 85).
X Hold the switch for an additional second.
X If the corresponding side window remains
closed after the button has been released,
the side window has been reset correctly.
If this is not the case, repeat the steps
above again.88
Side windows
Opening/closing