
Switching off the engine
Important safety notes
GWARNING
The automatic transmission switches to neu-
tral position Nwhen you switch off the engine.
The vehicle may roll away. There is a risk of an
accident.
After switching off the engine, always switch
to parking position P. Prevent the parked vehi-
cle from rolling away by applying the parking
brake.
!If the coolant temperature is very high, e.g.
after driving on hilly roads, leave the engine
running at idle speed for about two minutes
before turning it off.
This allows the coolant temperature to return
to normal.
Vehicles with automatic transmission
XStop the vehicle.
XShift the transmission to position P.
XApply the parking brake.
XTurn the key to position0in the ignition lock
and remove it.
The immobilizer is activated.
If you switch the engine off with the trans-
mission in position Ror D, the automatic
transmission shifts to Nautomatically.
If you then open one of the front doors or
remove the key from the ignition, the auto-
matic transmission automatically shifts to P.
If you shift the automatic transmission to N
before switching off the engine, the automatic
transmission remains in Neven if a front door
is opened.
XSecure the vehicle to prevent it from rolling
away (Ypage 135).
Parking the vehicle for a long period
If you leave the vehicle parked for longer than
four weeks, the battery may be damaged by
exhaustive discharging.
XDisconnect the battery (Ypage 261).
or
XConnect the battery to a trickle charger.
Be sure to observe the notes on charging the batteries (
Ypage 264).
You can obtain information about trickle
chargers from a qualified specialist work-
shop.
If you leave the vehicle parked for longer than 6
weeks, the vehicle may suffer damage as a
result of lack of use.
XVisit a qualified specialist workshop and seek
advice.
Driving tips
General notes
Important safety notes
GWARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect, for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
GWARNING
If you operate mobile communication equip-
ment while driving, you will be distracted from traffic conditions. You could also lose control
of the vehicle. There is a risk of an accident.
Only operate this equipment when the vehicle
is stationary.
Observe the legal requirements of the country in
which you are driving. Some jurisdictions pro-
hibit the driver from using a mobile phone while driving a vehicle.
Driving tips137
Driving and parking
Z

Warning display
Blind Spot Assist is not active at speeds below
approximately 20 mph (30 km/h). Vehicles in
the monitoring range are then not indicated.
If a vehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
approximately 20 mph (30 km/h), warning
lamp:lights up red in the exterior mirror on
the corresponding side. Warning lamp :
always lights up when a vehicle enters the blind
spot monitoring range from behind or from the
side. When you overtake a vehicle, the warning
only occurs if the difference in speed is less than
7 mph (11 km/h).
If you select reverse gear, Blind Spot Assist is
inactive.
The intensity of warning lamps :depends on
the brightness of the ambient light and is con-
trolled automatically.
Collision warning
If a vehicle is detected in the monitoring range of
Blind Spot Assist and you switch on the corre-
sponding turn signal, a double warning tone
sounds once. The warning lamp in the corre-
sponding exterior mirror flashes. If the turn sig-
nal remains on, detected vehicles are indicated
by the flashing of the warning lamp in the exte-
rior mirror. There are no further warning tones.
Activating Blind Spot Assist
XMake sure that Blind Spot Assist is activated
in the on-board computer (Ypage 187).
XTurn the key to position 2in the ignition lock.
The warning lamps in the exterior mirrors light
up for approximately 1.5 seconds.
Status indicators in the status overview submenu
If Blind Spot Assist is activated, the display
shows symbol :in the StatusOverviewsub-
menu of the on-board computer (Ypage 186). If
you are driving faster than 20 mph (30 km/h),
the symbol also shows radar waves ;between
the two vehicles. Blind Spot Assist is then ready
for use.
Towing a trailer
If you attach a trailer, make sure that you have
correctly established the electrical connection.
This can be accomplished by checking the trailer
lighting. Blind Spot Assist is then deactivated
and the Blind Spot Assist Currently
Unavail. See Operator's Manualmessage
appears in the display.
Lane Keeping Assist
General notes
Lane Keeping Assist monitors the area in front of
your vehicle by means of camera :which is
mounted at the top of the windshield. Lane
Keeping Assist detects lane markings on the
road and can warn you before you leave your
lane unintentionally.
This function is available in the range between
40 mph (60 km/h) and 125 mph (200 km/h).
A warning may be given if a front wheel touches a lane marking. It will warn you by means of
150Driving systems
Driving and parking

XSelectStatus Overviewin theAssist.menu and display the attention level
(Ypage 186).
The following information is displayed:
Rthe length of the journey since the last break.
Rthe attention level determined by ATTENTION
ASSIST, displayed in a bar display in five levels
from low to high.
Rif ATTENTION ASSIST is unable to calculate
the attention level and cannot output a warn-
ing, the System
Passivemessage appears in
the display. The bar display is then dimmed.
This is the case, for example, if you are pre-
dominantly driving at a speed below 40 mph
(60 km/h) or above 125 mph (200 km/h).
Activating ATTENTION ASSIST
XActivating ATTENTION ASSIST with the on-
board computer:
Ron vehicles without steering wheel buttons
(Ypage 177)
Ron vehicles with steering wheel buttons
(Ypage 187)
For vehicles with steering wheel buttons, the
system determines the attention level of the
driver depending on the setting selected:
Standard: the sensitivity with which the sys-
tem determines the attention level is set to
normal.
Sensitive: the sensitivity is set higher. The
driver is warned earlier.
When ATTENTION ASSIST is switched on and
the vehicle engine is running:
Ron vehicles without steering wheel buttons,
the À indicator lamp in the instrument
cluster lights up
Ron vehicles with steering-wheel buttons, the
display shows the Àsymbol:
-in the status area
-in the Status Overviewof the Assist.menu (Ypage 186)
For vehicles with steering wheel buttons, if you
deactivate ATTENTION ASSIST, the system is
automatically re-activated when you start the
engine. The system sensitivity then corresponds
to the last selection activated – standard or sen-
sitive.
If you switch off ATTENTION ASSIST in a vehicle without steering wheel buttons, the system
remains switched off even after you start the engine. The status of the system after switching
on the engine always corresponds to the status
last selected.
Warning in the display
If the system detects tiredness or increasing
lapses in concentration, the warning
Atten‐
tion Assist: Take a Break!orAttent.Asst: Take Break!is shown in the display.
An additional warning tone sounds.
XIf necessary, take a break.
XConfirm the message by pressing the a
button on the steering wheel.
On long journeys, take regular breaks in good
time to allow yourself to rest. If you do not take
a break and ATTENTION ASSIST continues to
detect increasing lapses in concentration, you
will be warned again after 15 minutes at the
earliest. This will only happen if ATTEN-
TION ASSIST still detects typical indicators of
fatigue or increasing lapses in concentration.
PARKTRONIC
General notes
PARKTRONIC is an electronic parking aid. The
system is equipped with ultrasonic sensors in
the front and rear bumpers to monitor the area
around your vehicle. PARKTRONIC indicates vis-
ually and audibly the distance between your
vehicle and an object.
Your vehicle features two separate sound emit- ters with different frequencies for the warning
tones. The warning ranges in front of and behind
the vehicle are indicated by different warning
tones.
PARKTRONIC is activated automatically when
you:
Rturn the key to position 2in the ignition lock
Rrelease the parking brake and
Rmove the selector lever to position D,N or R
PARKTRONIC is deactivated at speeds above
11 mph (18 km/h). PARKTRONIC is reactivated
at speeds below 10 mph (16 km/h).
Important safety notes
PARKTRONIC is only an aid. It cannot replace
your own awareness of the immediate surround-
ings. You are responsible for safe maneuvering,
Driving systems153
Driving and parking
Z

Towing a trailer
PARKTRONIC detects a coupled trailer if your
vehicle is equipped with the corresponding elec-
trical installations for trailer towing.
PARKTRONIC is deactivated for the rear area
when you establish an electrical connectionbetween your vehicle and a trailer. If you use an
adapter for the socket, remove it from the
socket after detaching the trailer. Otherwise,
PARKTRONIC remains deactivated for the rear
area.
Problems with PARKTRONIC
ProblemPossible causes/consequences and
MSolutions
Only the red segments in
the PARKTRONIC warn-
ing displays are lit.
In addition, a warning
tone sounds for approx.
two seconds
PARKTRONIC is then
deactivated.
The indicator lamp of the
f button lights up
and the red segments in
the PARKTRONIC warn-
ing display go out.PARKTRONIC has malfunctioned and has switched itself off.
XIf problems persist, have PARKTRONIC checked at a qualified spe- cialist workshop.
The PARKTRONIC warn-
ing displays implausible
distances.
For example, all the seg-
ments may be lit even
though there is no obsta-
cle present.The PARKTRONIC sensors are dirty or iced up.
XClean the PARKTRONIC sensors (Ypage 268).
XTurn the key to position 2in the ignition lock.
The license plate or other parts attached near the sensors may not be
secured correctly.
XCheck the license plate and attachment parts near the sensors for
correct seating.
An external radio or ultrasonic source may be causing interference.
XCheck PARKTRONIC functions in a different location.
Active Parking Assist
General notes
Active Parking Assist is an electronic parking
aid. The system uses ultrasound sensors to
measure the road on both sides of the vehicle
and indicates suitable parking spaces. It can
then actively steer and brake the vehicle to help
you to park and exit the parking space.
Active Parking Assist includes the PARKTRONIC
parking aid which indicates visually and audibly the distance between your vehicle and an
obstruction. To do this, PARKTRONIC uses the ultrasonic sensors of the Active Parking Assist
(
Ypage 153).
Important safety notes
Active Parking Assist is only an aid. It is not a
substitute for your attention to the immediate
surroundings. You are responsible for safe
maneuvering, parking and pulling away. Make
sure that no persons, animals or objects are in
the maneuvering range.
When you deactivate PARKTRONIC, Active Park-
ing Assist will also be deactivated.
156Driving system
s
Driving an d parking

XTo activate:make sure that the key is in
position 2in the ignition lock.
XShift the transmission to position k.
On vehicles with a tailgate, the rear view cam-
era flap opens. The audio display shows the
area behind the vehicle. The rear area shown
is divided by guide lines.
In vehicles with a trailer coupling installed, the
function mode of the rear view camera can be
switched over when the trailer is reached. The
rear view camera then changes the viewing
angle and shows a locating aid for the ball cou-
pling of the trailer tow hitch to help reach the
drawbar.
XTo switch function mode: select and con-
firm "Reverse parking" function :or "Cou-
pling up a trailer“ function ;using the audio
system control knob.
Information on the audio system control knob
can be found in the separate operating
instructions.
The symbol of the selected function is high-
lighted.
XTo switch off: shift the transmission to posi-
tion iorh.
The dynamic guide lines are hidden and after
about 15 seconds the rear view camera
switches itself off.
or
XDrive forwards more than about 30 ft (10 m).
or
XDrive forwards faster than 6 mph (10 km/h) .
or
XShift the automatic transmission to position
j.
In vehicles wit
h Active Parking Assist, the rear
view camera remains switched on after the ini-
tial shift to reverse gear for the whole duration of
active parking assistance. You can find informa-
tion on active parking assistance under "Active
Parking Assist“ (
Ypage 156).
Messages in the multimedia system dis-
play
:Yellow guide line at a distance of approx-
imately 13 ft (4.0 m) from the rear of the
vehicle
;White guide line without turning the steering
wheel, vehicle width including the exterior
mirrors (static)
=Yellow guide line for the vehicle width
including the exterior mirrors, at the current
steering angle (dynamic)
?Yellow lane marking the course the tires will
take at the current steering angle (dynamic)
AYellow guide line at a distance of approx-
imately 3 ft (1.0 m) from the rear of the vehi-
cle
BRed guide line at a distance of approximately
12 in (0.30 m) from the rear of the vehicle
CBumper
DVehicle center axis (locating aid)
The guide lines are shown when the transmis-
sion is in position k.
The distance specifications only apply to
objects that are at ground level.
162Driving systems
Driving and parking

On-board computer (vehicles without
steering wheel buttons)
Operating the on-board computer
Overview
:È and 3buttons
;Display
=f and gbuttons
XTo activate the on-board computer: turn
the SmartKey to position 1in the ignition lock.
If you remove the SmartKey, then quickly re-
insert it and turn to position 1, the on-board
computer and instrument cluster are not acti-
vated.
You can control the display and the settings in
the on-board computer with buttons :and =
on the instrument cluster.
Buttons on the instrument cluster
GWARNING
If you are driving and reach through the steer- ing wheel to operate the adjustment knob,
you could lose control of the vehicle. There is
a risk of an accident and injury.
Only operate the adjustment knobs when thevehicle is stationary. Do not reach through the
steering wheel when driving.
ÈPress briefly:
RSelects the menu or display
RIn the Settingsmenu: exits the
submenu without adopting the last
setting and returns to the menu's
start screen
ÈPress and hold:
RReturns to the standard display or the Distance menu without adopt-
ing the last setting
3Press briefly:
RSelects a submenu or function
RConfirms the selected entry in the
list or the display, or confirms the
setting
3Press and hold:
RResets the trip odometer and trip
computer values
RIn the start screen of the Settingsmenu: resets settings to the fac-
tory settings
RIn theSettingsmenu: resets val-
ues and returns to the menu's start
screen
f
gRSets the instrument cluster light-
ing (not in the Settingsmenu)
RScrolls through lists
RChanges values or settings
Display
Instrument cluster display
:
Clock (Ypage 189)
V Cruise control (
Ypage 144)
;Permanent display: outside temperature or
speed (Ypage 177)
On-board computer (vehicles without steering wheel buttons)173
On-board computer and displays
Z

Settings menu
Introduction
Settings menu start screen
The vehicle must be stationary. Use the buttons
in the instrument cluster.
XTo display: pressÈto select the Settingsmenu.
The Settings
menu is only displayed when the
vehicle is stationary. You can think of the order
of the submenus and functions as a circle. Press
3 on the instrument cluster to scroll through
the menu, starting with its start screen and
select its submenus or functions successively.
If you scroll forward using 3, the setting from
the previous submenu or function is adopted.
If you press Èin a submenu, the submenu or
function is exited without adopting the setting.
The display then shows the start screen of the
Settings
menu.
Depending on the vehicle’s equipment, you have the following options in the Settings
menu:
RSetting the language for the display messages
and displays (Ypage 176)
RDeactivating and activating ESP®
(Ypage 176)
RSetting the sensitivity of the rain sensor
(Ypage 177)
RActivating and deactivating ATTENTION
ASSIST (Ypage 177)
RSelecting the permanent display in the header
of the display (Ypage 177)
RSetting the unit for distance, consumption
and speed displays (Ypage 177)
RSetting the time and date (Ypage 178)
XTo reset settings to the factory settings:
turn the SmartKey to position 1in the ignition
lock and press and hold 3in the Settings
menu for at least five seconds.
For safety reasons, not all functions are reset.
Setting the display language
The vehicle must be stationary. Use the buttons
in the instrument cluster.
XPress Èto select the Settingsmenu.
XPress3to select the Languagesubmenu.
The display shows the current language selec- tion.
XPress forg to set the language for all dis-
play messages.
XPress 3to confirm.
The next submenu is shown in the display.
Deactivating/activating ESP®
This menu is only available on vehicles without
the å button on the center console.
Please observe the important safety notes
under "ESP
®(Electronic Stability Program)"
(Ypage 66).
GWARNING
If you deactivate ESP
®, ESP®no longer sta-
bilizes the vehicle. There is an increased risk
of skidding and an accident.
Only deactivate ESP
®in the situations descri-
bed in the following.
It may be best to deactivate ESP
®in the follow-
ing situations:
Rwhen using snow chains
Rin deep snow
Ron sand or gravel
Further information can be found under "ESP®
(Electronic Stability Program)" (Ypage 66).
The vehicle must be stationary and the engine
must be running. Use the buttons in the instru-
ment cluster.
XPress Èto select the Settingsmenu.
XPress3to select the ESPsubmenu.
The display shows the current status.
If the display shows the Oper.
OnlyPoss.WithEngineOnmessage, confirm the mes-
sage with 3and start the engine. The display
then shows the ESP
submenu and the ESP®
status.
If theESP
Inoperativemessage is shown in
the display, ESP is not available due to a mal-
function and is deactivated. If you confirm the
176On-board computer (vehicles without steering wheel buttons)
On-board computer and displays

Setting the time and date
The vehicle must be stationary. Use the buttonsin the instrument cluster.
XPress Èto select the Settingsmenu.
XPress3to select the time and date display.
XPress forg to set the hours and press 3
to confirm.
XPress forg to set the minutes and press
3 to confirm.
XPress forg to set the day and press 3to
confirm.
XPress forg to set the month and press 3
to confirm.
XPress forg to set the year and press 3to
confirm.
The display shows the Settings
menu again.
On-board computer (vehicles with
steering wheel buttons)
Operating the on-board computer
Overview
:Display
;Right control panel
=Left control panel
XTo activate the on-board computer: turn
the SmartKey to position 1in the ignition lock.
You can control the displays and the settings in the on-board computer using the steering wheel
buttons in left control panels =. Using thesteering wheel buttons in right control panel
;
you can control the functions of the audio sys-
tem and switch on voice-operated control of the
navigation system (see the separate operating
instructions).
Steering wheel buttons
Left control panel on the steering wheel
=
;RCalls up the menu bar in the dis-
play
RSelects a menu
9
:Press briefly:
RScrolls through lists
RSelects a submenu or function
RIn the Audiomenu: opens the
track or station list and selects a
station or an audio track
RIn the Tel(Telephone) menu:
switches to the phone book and
selects a name or a telephone
number
9
:Press and hold:
RQuickly scrolls through all lists
RIn the Audiomenu: selects a sta-
tion or an audio track using rapid
scrolling.
RIn the Tel(telephone) menu:
starts rapid scrolling if the phone
book is open
aRConfirms the display message
RIn all menus: confirms the selected
entry in the list or the display
RIn the Audiomenu: stops the sta-
tion search
RIn the Tel(telephone) menu:
switches to the phone book and
starts dialing the selected number
178On-board computer (vehicles with steering wheel buttons)
On-board computer and displays