
007C
Directs air to the windshield, the air
vents and into the footwell
007D Directs air to the air vents and into
the footwell
Adjusting X
Switch on climate control (Y page 116).
X Set air-distribution control 0085for the heat-
ing (Y page 113 )or air-conditioning system
0083 (Ypage 114) to the corresponding sym-
bol. Setting the airflow
X Switch on climate control (Y page 116).
X Vehicle with heating/rear-compart-
ment heating: set airflow control 0044of the
heating (Y page 113) or of the rear-com-
partment heating (Y page 115) to the
desired level.
X Vehicle with air conditioning/rear-com-
partment air conditioning: press the
0095 button to reduce or the 0097button
to increase the airflow.
The blower speeds are shown in bars next
to the buttons. Defrosting the windows
You can use the "defrosting" function to
defrost the windshield or to demist the inside of the windshield and the side windows.
Only use the following settings until the win-
dows are clear again.
X Vehicle with window heating: switch on
the front (Y page 119) and/or rear window
defroster (Y page 119) .
X Switch on climate control (Y page 116).
Vehicle with heating
X Set temperature control 0043and airflow
control 0044to0085 (Ypage 113).
X Set air-distribution control 0085to007E
0085 (Ypage 113). X
Close the center air vents (Y page 121) and
the air outlets for the headroom and the
rear compartment (Y page 121).
X Direct the side air vents towards the side
windows and open the defroster vents for
the side windows (Y page 121).
Vehicle with air conditioning X Set temperature control 0043to
0085 (Ypage 114).
X Press the 0097button until the maximum
blower output is reached.
All bars in the display next to the button
light up.
X Set air-distribution control 0083to007E
0085 (Ypage 114).
X Close the center air vents (Y page 121) and
the air outlets for the headroom and the
rear compartment (Y page 121).
X Direct the side air vents towards the side
windows and open the defroster vents for
the side windows (Y page 121). Clearing condensation from the win-
dows
Windows fogged up on the inside You should only select this setting until the
windows are clear again.
X Vehicle with window heating: switch on
the front (Y page 119) and/or rear window
defroster (Y page 119) .
X Switch on climate control (Y page 116).
X Switch off air-recirculation mode
(Y page 120).
Vehicle with heating
X Set temperature control 0043to a higher tem-
perature (Y page 113).
X Set airflow control 0044to a higher blower
setting. It should be set at least to level two
(Y page 113).
X Set air-distribution control 0085to007E
0085 (Ypage 113). 118
Operating the climate control systemClimate control

i
If the windows still fog up, set the control
as described for defrosting (Y page 118).
Vehicle with air conditioning
X Activate cooling with air dehumidification
(Y page 117).
X Press the 0066button (Y page 114).
The reheat function is switched on. The
indicator lamp in the switch lights up.
To switch off the reheat function, press the
0066 button again. The indicator lamp in
the button goes out.
Windows fogged up on the outside You should only select this setting until the
windshield is clear again.
X Switch on the windshield wipers
(Y page 107).
X Switch on climate control (Y page 116).
X Adjust air distribution to the footwell
(Y page 117).
X Close the air vents (Y page 120).Window heating
Windshield heater Windshield heater switch
The windshield heater consumes a lot of
power. You should therefore switch it off as
soon as the windshield is clear. The wind-
shield heating otherwise switches off auto-
matically after 5 minutes. X
Start the engine.
X To switch on/off: press the0085switch.
The indicator lamp in the 0085button
comes on when the windshield heating is
switched on.
If the indicator lamp in the 0085windshield
heating button flashes, the on-board voltage
is too low. The windshield heating has
switched off prematurely or cannot be acti-
vated.
X Switch off any consumers that are not
required, e.g. reading lamps or interior
lighting.
If enough on-board voltage is available again
within 30 seconds, the windshield heating
automatically switches on again. It otherwise
remains switched off.
Rear window defroster Rear window defroster switch
The rear window defroster consumes a lot of
power. You should therefore switch it off as
soon as the window is clear. The rear window
heating otherwise only switches off automat- ically after 12 minutes.
X Start the engine.
X To switch on/off: press the0071switch.
The indicator lamp in the 0071button
comes on when the rear window defroster
is switched on.
If the indicator lamp in the 0071rear window
defroster button flashes, the on-board volt-
age is too low. The rear window defroster has Operating the climate control system
119Climate control

switched off prematurely or cannot be acti-
vated.
X Switch off any consumers that are not
required, e.g. reading lamps or interior
lighting.
If enough on-board voltage is available again
within 30 seconds, the rear window heating
automatically switches on again. It otherwise
remains switched off. Switching air-recirculation mode
on/off
Important safety notes When you switch on air-recirculation mode,
the windows could fog up more quickly, in
particular at low outside temperatures. Only
switch on air-recirculation mode for a short
time.
You can deactivate the intake of fresh air if
unpleasant odors enter the vehicle from out-
side. The air inside the vehicle will only be
circulated.
Heating/air-conditioning system Air-recirculation mode switches off automat-
ically after about 10 to 30 minutes, depending
on the outside temperature.
X Switch on climate control (Y page 116).
X To switch on/off: press the008Aswitch.
If the indicator lamp in the 008Abutton
lights up, air-recirculation mode is activa-
ted.
Rear-compartment heating/rear-com-
partment air conditioning On vehicles with a rear-compartment heating
and air-conditioning system, you can acti-
vate/deactivate air-recirculation mode for
the rear-compartment climate control.
X Switch on climate control (Y page 116).
X To activate: set the temperature control of
rear-compartment heating 0087(Ypage 115) or rear-compartment air conditioning sys-
tem
0044(Ypage 116) to the center position.
Only one of the two climate control sys-
tems in the rear compartment is activated
and is in air-recirculation mode.
X To deactivate: turn the temperature con-
trol of rear-compartment heating 0087
(Y page 115) or rear-compartment air-con-
ditioning system 0044(Ypage 116) clock-
wise or counterclockwise. Only change the
temperature in small increments. Adjusting the air vents
Important safety notes
G
WARNING
Very hot or very cold air can flow from the air vents. This could result in burns or frostbite in the immediate vicinity of the air vents. There
is a risk of injury.
Make sure that all vehicle occupants always
maintain a sufficient distance to the air out-
lets. If necessary, redirect the airflow to
another area of the vehicle interior.
The center and side air vents are adjustable.
On vehicles with a rear-compartment air-con-
ditioning system, you can also adjust the air
vents in the roof duct.
i For virtually draft-free ventilation, adjust
the sliders of the center air vents to the
center position.
In order to ensure the direct flow of fresh air
through the air vents into the vehicle interior, please observe the following notes:
R keep the air inlet grille on the hood free of
blockages, such as ice, snow or leaves.
R never cover the vents or the ventilation
grilles in the vehicle interior. 120
Adjusting the air ventsClimate control

radar system only. Removal, tampering, or
altering of the device will void any warran-
ties, and is not permitted by the FCC. Do
not tamper with, alter, or use in any non-
approved way.
Any unauthorized modification to this
device could void the user’s authority to
operate the equipment.
Monitoring range of the sensors
In particular, the detection of obstacles can
be impaired in the case of:
R dirt on the sensors or anything else cover-
ing the sensors
R poor visibility, e.g. due to fog, heavy rain or
snow
R narrow and short vehicles, e.g. motorcy-
cles or bicycles
R very wide lanes
R narrow lanes
R vehicles not driving in the middle of their
lane
R barriers or other road boundaries
Vehicles in the monitoring range are then not
indicated. Blind Spot Assist monitors the area approx-
imately 10 ft (3.0 m)behind your vehicle and
approximately 1.6 ft (0.5 m) to 11.5 ft (3.5 m) each side of it. For this purpose, Blind Spot
Assist uses radar sensors in the rear bumper and behind the protective strips of the B-pil-
lars.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may be the case if the vehicles are driving on the inner
side of their lane.
Due to the nature of the system:
R a clear warning situation may not occur.
The yellow indicator lamp on the relevant
side of the vehicle will then light up.
R warnings may be issued in error when driv-
ing close to crash barriers or similar solid
lane borders.
R warnings may be interrupted when driving
alongside particularly long vehicles, for
example trucks, for a prolonged time.
The four sensors of Blind Spot Assist are inte-
grated into the rear bumper and behind the
protective strips of the B-pillars. Make sure
that the bumper and protective stripping are
free of dirt, ice or slush in the vicinity of the
sensors. The radar sensors must not be cov-
ered, for example by cycle racks or overhang- ing loads.
Have the function of the radar sensors
checked at a qualified specialist workshop:
R after a severe impact
R after damage to the bumper
R after damage to the protective strips of the
B-pillars
Blind Spot Assist may otherwise not work
properly.
Indicator and 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. 164
Driving systemsDriving and parking

0043
Lane Keeping Assist camera
Lane Keeping Assist supports you from
speeds of approximately 40 mph(60 km/h).
Important safety notes G
WARNING
Lane Keeping Assist may not always clearly
recognize lane markings.
In this case, Lane Keeping Assist may:
R give an unnecessary warning
R not give a warning
There is a risk of an accident.
Always pay particular attention to the traffic
situation and stay in lane, in particular if
warned by Lane Keeping Assist. G
WARNING
The Lane Keeping Assist warning does not
return the vehicle to the original lane. There is a risk of an accident.
You should always steer, brake or accelerate
yourself, in particular if warned by Lane Keep-ing Assist.
If you fail to adapt your driving style, Lane
Keeping Assist can neither reduce the risk of
accident nor override the laws of physics.
Lane Keeping Assist cannot take into account road, weather or traffic conditions. Lane
Keeping Assist is only an aid. You are respon-
sible for the distance to the vehicle in front,
for vehicle speed, braking in good time and for
staying in your lane.
Lane Keeping Assist does not keep your vehi- cle in its lane. The system may be impaired or may not func-
tion if:
R if the vehicle is incorrectly loaded
(Y page 240)
R there is poor visibility, e.g. due to insuffi-
cient illumination of the road, or due to
snow, rain, fog or spray
R there is glare, e.g. from oncoming traffic,
the sun or reflection from other vehicles
(e.g. if the road surface is wet)
R the windshield is dirty, fogged up, damaged
or covered, for instance by a sticker, in the
vicinity of the camera
R no, or several, unclear lane markings are
present for one lane, e.g. in a construction
area
R the lane markings are worn away, dark or
covered up, e.g. by dirt or snow
R the distance to the vehicle in front is too
small and the lane markings thus cannot be
detected
R the lane markings change quickly, e.g.
lanes branch off, cross one another or
merge
R the road is narrow and winding
R there are highly variable shade conditions
on the road
A warning may be given if a front wheel
passes over a lane marking. In addition, a
warning tone sounds and the 00B0indicator
lamp in the instrument cluster lights up.
Activating/deactivating Lane Keeping
Assist
Lane Keeping Assist is automatically activa-
ted when you start the engine.
X To deactivate: press thejbutton in
the center console (Y page 37).
On vehicles without steering wheel but-
tons:
OFF
OFF flashes briefly in the display and the
00B0 indicator lamp in the instrument clus-
ter flashes and then lights up continuously.
On vehicles with steering wheel but-
tons: 166
Driving systemsDriving and parking

The camera is in the middle of the roof above
the high-mounted brake lamp (Y page 269).
The rear view camera may show obstacles in perspectival distortion, incorrectly or not at
all. The rear view camera cannot display all
objects located very near and/or under the
rear bumper. It does not warn you of a colli-
sion, persons or objects.
The area behind the vehicle is displayed in a
mirrored fashion, as in the rear-view mirror or
the exterior mirrors.
The function of the rear view camera may be
partially or completely impaired in the follow-
ing circumstances:
R it is raining very heavily or snowing, or it is
foggy.
R the parking space is located in a very dark
place.
R the camera is exposed to very strong white
light. White stripes may appear on the dis-
play.
R the surrounding area is illuminated with flu-
orescent light. The display may flicker.
R if the temperature changes very quickly, for
example if you drive into a heated garage in the winter.
R ambient temperatures are very high.
R the camera lens is dirty or obstructed.
R the rear of the vehicle is damaged. In this
case, have the position and setting
checked at a specialist workshop.
The rear view camera is activated when you
engage reverse gear R.
You can find information on cleaning the cam-
era in the "Maintenance and care" section
(Y page 269). Working mode
ADR (working speed governor)
General notes When activated, ADR automatically increases
the engine speed to a preset speed or a speed
you have set.
i After a cold start, the idling speed of the
engine is increased automatically. If the
preset working speed is lower than the
increased idling speed, the working speed
is only reached once the engine has com-
pleted the warm-up phase.
It is only possible to activate ADR with the
vehicle stationary and the parking brake
applied.
The selector lever of the automatic trans-
mission must be in position P.
Activating/deactivating ADR X
To activate: press upper section 0043of the
0091 switch while the engine is running.
The indicator lamp in the switch comes on.
The 004E indicator lamp in the instrument
cluster lights up or the display shows the
following message: Operating speed Operating speed
governor active
governor active.
X To deactivate: press lower section 0044of
the 0091 switch while the engine is run-
ning.
The indicator lamp in the switch goes out. 172
Working modeDriving and parking

Switching surround lighting on or off
Using the steering wheel buttons
X Press the 0080or007F button repeatedly
until the Settings
Settings menu appears in the
display.
X Press the 0063button to switch to the sub-
menu selection.
X Press the 0081or0082 button to select the
Lighting
Lighting submenu.
X Press the 0063button to select the Loc.
Loc.
lighting
lighting function.
The selection marker is on the current set-
ting.
X Press the 0081or0082 button to switch
the surround lighting On
OnorOff
Off .
If you switch the surround lighting to On
On, the
following lamps light up in the dark after you
have unlocked the vehicle using the key:
R the parking lamps
R the tail lamps
R the license plate lamps
R the fog lamps
The surround lighting automatically switches
off after 40 seconds or if you:
R open the driver's door
R insert the key into the ignition lock
R lock the vehicle using the key
Setting the exterior lighting delayed
switch-off In the
Headlamps Headlamps submenu, you can set
whether and for how long you wish the exte-
rior lighting to remain on after closing the
doors.
Using the steering wheel buttons
X Press the 0080or007F button repeatedly
until the Settings Settings menu appears in the
display.
X Press the 0063button to switch to the sub-
menu selection.
X Press the 0081or0082 button to select the
Lighting
Lighting submenu.
X Press the 0063button to select the Head‐
Head‐
lamps
lamps function.
The selection marker is on the current set-
ting.
X Press the 0081or0082 button to select
whether and for how long you wish the
exterior lighting to remain on.
If you have set the delayed switch-off and
switch off the engine, the following remain lit:
R the parking lamps
R the tail lamps
R the license plate lamps
R the fog lamps
i You can reactivate this function by open-
ing a door within 10 minutes.
If, after switching off the engine, you do not open a door or you close an open door, the
exterior lighting switches off after
60 seconds.
Vehicle submenu Setting the windshield wiper sensitivity
You can use the
Wipe Wipesensor
sensor function to set
the sensitivity of the rain/ light sensor. On-board computer (vehicles with steering wheel buttons)
193On-board computer and displays Z

Display messages
Possible causes/consequences and
0050
0050Solutions Err
Err flashes for 5 seconds, the
00B0indicator lamp also flashes and
then lights up constantly.
Lane Keeping Assist is deactivated and temporarily inoperative.
Possible causes are:
R There are no lane markings present.
R The camera's functionality is impaired due to heavy rain, snow or
fog.
R The camera cannot recognize the road markings:
- It is too dark.
- The lane markings are worn or are covered, for example, by
dirt or snow.
R The windshield is dirty in the camera's field of vision.
X Stop the vehicle paying attention to road and traffic conditions.
X Secure the vehicle to prevent it from rolling away (Y page 149).
X Clean the windshield (Y page 267), particularly in the camera's
field of vision.
If the 00B0 indicator lamp goes out, Lane Keeping Assist is
operational again.
If the problem persists, visit a qualified specialist workshop. 0099
dEF Chk dEF Chk In addition, the yellow
00B9Check Engine indicator lamp and the
yellow 00E2DEF indicator lamp light up and a warning tone
sounds.
The DEF reducing agent is contaminated, diluted or is not compli-
ant with ISO 2224 1.
After the first message and under normal operating conditions,
you can drive on for up to approximately 50 miles (80 km). Then a warning tone sequence sounds and the engine can only be started
another 10 times.
X Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. 200
Display messagesOn-board computer and displays