
adjustthe seat belt outlet and the front
passenger seat accordingly.
#Alw ays obser vethech ild restra int sys‐
te m manufacturer's ins tallation instruc‐
tions.
When ins talling a child restra int sy stem on the
front passenger seat, observ eth eve hicle-spe‐
cific information (
→page 39).
If a person is sitting in the front passenger
seat: PASSENGER AIR BAG OFF may be lit con‐
tinuously or be off, depending on the person's
st ature. Alw ays obser vethefo llowing informa‐
tion.
If th e front passenger seat is occupied by:
RAn adult or a pe rson with a build cor respond‐
ing tothat of an adult, thePA SSENGER AIR
BA G OFF indicator lamp must be off. This
indicates that the front passenger air bag is
enabled.
If th ePA SSENGER AIR BAG OFF indicator
lamp is lit continuousl y,an adult or person
with a build cor responding tothat of an adult should not use
the front passenger seat.
Ins tead, they should use a rear seat.
RA person with a smaller build (e.g. a teenager
or small adult), thePA SSENGER AIR BAG OFF
indicator lamp either lights up and remains lit
depending on there sult of the classification
or, alternativel y,goes out.
-PA SSENGER AIR BAG OFF is off: mo ve
th e front passenger seat as far back as
possible or a person of smaller stature
should use a rear seat.
-Ifth ePA SSENGER AIR BAG OFF indicator
lamp is lit continuously: a person of
smaller stature should not use the front
passenger seat.
& WARNING Risk of injury or death when
th ePA SSENGER AIR BAG OFF indicator
lamp is lit
If th ePA SSENGER AIR BAG OFF indicator
lamp remains lit af terth e sy stem self-test,
th e front passenger air bag is deactivated. It
will not be deplo yed in theeve nt of an acci‐
dent. In this case, the front passenger air bag
cannot perform its intended pr otective func‐
tion, e.g. when a person is seated in the front
passenger seat.
That person could, forex ample, come into
con tact wi th theve hicle interior, especially if
th e person is sitting too close tothe cockpit.
If th e front passenger seat is occupied,
alw ays ensure that:
RThe classification of the person in the
front passenger seat is cor rect and the
front passenger air bag is enabled or
deactivated in accordance with the per‐
son in the front passenger seat.
RThe person is seated properly with a cor‐
re ctly fastened seat belt.
RThe front passenger seat has been mo ved
as far back as possible.
Fu rther related subjects:RChild restra int sy stem on the front passenger
seat (→page 51).
Occupant saf ety 43

#Press button1repeatedly until the indica‐
to r lamp in the button lights up.
The front passenger seat is selected.
#Ad just the front passenger seat using the
buttons in the door control panel on the driv‐
er's side.
Ad justing the 4-w aylumbar support
1Toraise
2To sof ten
3To lowe r
4To harden
#Using buttons 1to4, adjust the conto ur
of the backrest individually tosuit your bac k.
Headrestra ints
Ad justing the front seat head restra ints man‐
ually
& WARNING Risk of injury from adjusting
th eve hicle settings while theve hicle is in
motion
Yo u could lose cont rol of theve hicle in the
fo llowing situations:
Rifyo u adjust the driver's seat, the head
re stra int, thesteering wheel or the mir ror
while theve hicle is in motion
Rifyo ufa sten your seat belt while theve hi‐
cle is in motion
#Before starting the engine: adjust the
driver's seat, the head restra int, the
st eering wheel or the mir ror and fasten
yo ur seat belt.
86
Seats and stowing

Theexterior lighting (e xcept parking and stand‐
ing lamps) switch es off automatically when the
driver's door is opened.
Au tomatic headlamp mode
The pa rking lights, low beam and daytime run‐
ning la mps are switched on or off automatically
depending on the ignition status, whe ther the
engine is running and on the ambient light.
&
WARNING Risk of accident when the low
beam is switched off in poor visibility
When the light switch is set toÃ, the low
beam may not be switched on automatically
if th ere is fog, snow or other causes of poor
visibility such as spr ay.
#In such cases, turn the light switch to
L.
The automatic driving lights are only an aid. You
are responsible forve hicle lighting.
Ac tivating/deactivating the rear fog light
Re quirement
The light switch is in theL orà position.
#Press theR button.
Please obser vethe count ry-specific la wsonthe
use of rear fog lamps.
Operating the light combination switch
1High beam
2Turn signal light, right
3High-beam flasher
4Tu rn signal light, left
#Pull or push the combination switch in the
re leva nt di rection following the ar row.
Switching on the high beam manually
#Ve hicles with Adaptive Highbeam Assis t:
Tu rn the light switch totheL position.
RPress the combination switch be yond the
pressure point in the direction of
ar ro w 1.
When the high beam is activated, the indicator
lamp for low beam is deactivated and replaced
by the indicator lamp forth e high beam.
#To switch off the high beam: movethe
combination switch back toits starting posi‐
tion.
#To indicate briefl y:press the combination
switch briefly up tothe pressure point in the
direction of ar row2or4.
The cor responding turn signal light flashes
th re e times.
Light and visibility 11
3

#Toindicate for a duration: pressthe combi‐
nation switch be yond the pressure point in
th e direction of ar row2or4.
Ac tivating/deactivating the hazard warning
light
#Press button :.
Cornering light
Cornering light function
Cornering light impr ovesth e illumination of the
ro adw ayove r a wide angle in the direction you
are turning, enabling better visibility in tight
bends, forex ample. It can only be activated
when the low beam is switched on.
The function is active:
RAt speeds below 25 mph (40 km/h) when
th e turn signal light is switched on or the
st eering wheel is turned.
RAt speeds between 25 mph (40 km/h) and
45 mph (70 km/h) when thesteering wheel
is turned.
Tr af fic circle and intersection function: The
cornering light is activated on bo thsides thro ugh
an evaluation of the cur rent GPS position of the
ve hicle. It remains active until af terth eve hicle
has left the traf fic circle or the intersection.
Ad aptive Highbeam Assist
Function of Adaptive Highbeam Assist
&
WARNING Risk of accident despite
Ad aptive Highbeam Assist
Ad aptive Highbeam Assist does not recog‐
nize thefo llowing road users:
RRo ad users without lights, e.g. pedes‐
trians
RRo ad users with poor lighting, e.g.
cyclists
RRo ad users whose lighting is obstructed,
e.g. bya bar rier
11 4
Light and visibility

#Always secure the engine against unin‐
te ntional starting before car rying out
maintenance or repair work.
Re quirementsRPark position jis selected.
RThe anti- theft alarm sy stem is not armed.
RThe panic alarm is not armed.
RThe hazard warning lights are switched off.
RThe engine hood is closed.
RThe doors are closed and loc ked.
RThe windo wsand sliding sunro of are closed.
#Start theve hicle using the smartphone:RAf tereve ryvehicle start, the engine runs for
te n minu tes.
RYo u can car ryout a maximum of two consec‐
utive starting attem pts.
RYo u can stop theve hicle again at any time.
RFu rther information can be found inthe
smartphone app. Securing
the engine against starting before
car rying out maintenance or repair work:
#Switch on the hazard warning lights.
or
#Un lock the doors.
or
#Open a side window or the sliding sunroof.
St arting theve hicle in emer gency operation
mode
If th eve hicle cannot be star ted, the 3 O D F H W K H
. H \ L Q W K H 0 D U N H G 6 S D F H 6 H H 2 S H U D W R U
V 0 D Q X D O
display message appears in the multifunction
displa y.
#Make sure that mar ked space 2is em pty.
#Re mo veSmartK ey1 from theke yring.
#Place Smart Key1 in mar ked space 2.
The vehicle will start af ter a short while.
If yo ure mo veSmartK ey1 from mar ked
space 2the engine continues running. For
fur ther vehicle starts ho wever,SmartK ey1
must be located in mar ked space 2during
th e entire journe y.
#Have SmartK ey1 checked at a qualified
specialist workshop.
If th eve hicle does not star t:
#Lea veSmartK ey1 in mar ked space 2.
#Depress the brake pedal and start theve hicle
using thest art/ stop button.
% You can also switchon the po wer supp lyor
th e ignition with thest art/ stop button.
Driving and parking 13
1

RTurkey :not requ ired
RUn ited Arab Emirates: ER41849/15
RUn ited States: NZLMUAHL5
Electric parking brake
Automatically applying the electric parking
brake
& WARNING Risk of accident and injury
due tochildren left unatte nded inthe
ve hicle
If yo u lea vechildren unaccompanied in the
ve hicle, they may be able toset theve hicle in
motion, forex ample by:
RRe leasing the parking brake.
RShifting the transmission out of park
position j.
RStarting the engine.
In addition, they may operate vehicle equip‐
ment.
#Ne ver lea vechildren and animals unat‐
te nded in theve hicle.
#When leaving theve hicle, alw aysta ke
th e SmartK eywith you and lock the
ve hicle.
The electric parking brake is applied if the trans‐
mission is in position jand one of thefo llow‐
ing conditions is fulfilled:
RThe engine is switched off.
RThe seat belt tongue is not inser ted in the
seat belt buckle of the driver's seat and the
driver's door is opened.
% Toprev ent application: pull the handle of the
electric parking brake.
In thefo llowing situations, the electric parking
brake is also engaged:
RThe Dis tance Pilot DISTRONIC brings the
ve hicle toast andstill.
RThe HOLD function is keeping theve hicle sta‐
tionar y.
RParking Pilot is keeping theve hicle station‐
ar y. This is only
the case if one of thefo llowing con‐
ditions is also fulfilled:
RThe engine is switched off.
RThe seat belt tongue is not inser ted in the
seat belt buckle of the driver's seat and the
driver's door is opened.
RThere is a sy stem malfunction.
RThe po wer supply is insuf ficient.
RThe vehicle is stationary for a lengt hyperiod.
When the electric parking brake is applied, the
F (USA) or !(Canada) indicator lamp
lights up in the instrument clus ter.
The electric parking brake is not automatically
applied if the engine is switched off bythe ECO
st art/ stop function.
Re leasing the electric pa rking brake auto‐
matically
The elect ric park ing brake is released when the
fo llo wing c
onditions are fulfilled:
RThe engine is
running.
RThe seat belt tongue is inser ted into the seat
belt buckle of the driver's seat.
14 8
Driving and pa rking

associated damage, which may not be visible,to
th e bumpers or radiator grille, ha vethe function
of thera dar sensors checked at a qualified spe‐
cialist workshop. The driver assis tance sy stem
may no longer workproperly.
Overview of driving and driving saf ety sys‐
te ms
In this section, youwill find information about
th efo llowing driving sy stems and driving saf ety
sy stems:
R360° Camera (→page 181)
RABS ( Anti-lock Braking Sys tem) (→page 151)
RDis tance Pilot DISTRONIC (→pa ge 161)
RAIR BODY CONTROL (→page 172)
RAc tive Brake Assi st(→page 155)
RAc tive Lane Keeping Assist (→page 195)
RATTENTION ASSIST (→page 189)
RBA S (Brak eAssist System) (→page 151)
REBD ( Electronic Brakeforc eDistribution)
(→page 155)
RESP®(E lectronic Sta bility Pro gram)
(→page 152)
RDRIVE PIL OT(→page 168)
RHOLD fu nction (→page 171)
RSteering Pilot (→page 168)
RParking Pilot (→page 184)
RParking Assist PARKTRONI C (→page17 6)
RRe ar view camera (→page 179)
RCruis e control (→page 160)
RBlind Spot Assist andActive Blind Spot Assi st
(→page 193)
RTraf fic Sign Assist (→page191)
Fu nctions of ABS (anti-lock braking sy stem)
ABS regulates the brake pressure in critical driv‐
ing situations:
RDuring braking, the wheels are pr evented
from blocking, forex ample due tomaximum
full-s top braking or insuf ficient traction of the
tires.
RVe hicle steerability while braking is ensured.
RABS is active from speeds of appr ox. 5 mph
(8 km/h).
If ABS inter venes when braking, youwill feel a
pulsing in the brake pedal. The pulsating brake
pedal can be an indication of hazardous road
conditions and can ser veas a reminder totake
ex tra care while driving.
Sy stem limits
ABS may be impaired or may not function if a
malfunction has occur red and theye llow !
ABS warning lamp lights up continuously in the
instrument clus ter af terth e engine is star ted.
Fu nction of BAS (Brake Assist Sy stem)
&
WARNING Risk of an accident caused by
a malfunction in BAS (Brake Assist Sys‐
te m)
If BA S is malfunctioning, the braking dis tance
may increase in an eme rgency braking situa‐
tion.
Driving and parking 15
1

#Depress the brake pedal with full forc e
in emer gency braking situations. ABS
pr eve nts the wheels from locking.
BA S suppo rts yo ur eme rgency braking situation
with additional brake forc e.
If yo udepr essthe brake pedal quickl y,BA S is
acti vated:
RBA S au tomatical lyboosts the brake pres‐
sure.
RBA S can short enthe braking dis tance.
RABS pr events the wheels from locking.
The brakes will function as usual once you
re lease the brake pedal. BAS is deactivated.
Functions of ESP®(Electronic Stability Pro‐
gr am)
&
WARNING Risk of skidding if ESP®is
malfunctioning
If ESP
®is malfunctioning, ESP®cannot car ry
out vehicle stabilization. In addition, other
driving saf etysy stems are switched off.
#Drive on carefull y.
#Have ESP®checked at a qualified spe‐
cialist workshop.
&
WARNING Risk of skidding if ESP®is
deactivated
If yo u deactivate ESP
®, ESP®cannot car ry
out vehicle stabilization.
#ESP®should only be deactivated in the
fo llowing situations.
ESP®monitors and impr oves driving stability and
traction, particular ly inthefo llowing situations:
RWhen pulling away on wet or slippe ryroads.
RWhen braking.
RIn stro ng sidewinds when you are driving
fast erthan 50 mph (80 km/h).
ESP
®can stabilize theve hicle byinter vening in
th efo llowing ways:
ROne or more wheels are braked.
RThe engine output is adap ted according to
th e situation.
ESP
®is deactivated if the ESP®OFF å warn‐
ing lamp lights up continuously in the instrument
clus ter:
RDriving stability will no longe r be improved.
RCrosswind Assist is no longer active.
RThe drive wheels could spin.
RETS/4ETS traction control is still active.
% Even when ESP
®is deactivated, you are still
assis tedby ESP®when braking.
ESP
®is inter vening if the ESP®÷ warning
lamp flashes in the instrument clus ter:
RDo not deacti vate ESP®.
15 2
Driving and pa rking