
Monitoring range of the sensors
In particular, the detection of obstacles can
be impaired in the case of:
R dirt on the sensors or obscured sensors
R poor visibility, e.g. due to fog, heavy rain,
snow or spray
R narrow vehicles, e.g. motorcycle sorbicy-
cles
R very widel anes
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. Example
:Saloon
Blind Spot Assist monitors the area up to
3.0 mbehind your vehicle and directly nextto
your vehicle, as shown in the diagram.
If the lanes are narrow, vehicles driving in the
lane beyond the lane nexttoy our vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may be the case if ther eare vehicles at the edge of
their lane nearest your vehicle. Due to the nature of the system:
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 long vehicles, for example lor-
ries, for aprolonged time
The two radar sensor sfor Blind Spot Assist
are integrated intot he sides of the rear
bumper. Make sure that the bumper is free of dirt, ice or slush in the vicinity of the sensors.
The sensor smust not be covered, for exam-
ple by cycle rack soroverhanging loads. Fol-
lowing asevere impact or in the event of dam-
age to the bumpers, have the function of the
sensor schecked at aqualified specialist
workshop. Blind Spot Assist may otherwise
not work properly.
Indicator and warning display :
Indicator lamp (yellow)
Warnin glamp (red)
Blind Spot Assist is not activ eatspeeds below
approximately 30 km/h. Vehicles in the mon- itorin grange are then not indicated.
If Blind Spot Assist is activated, indicator
lamp :in the exterior mirror slights up yel-
low up to aspeed of 30 km/h. At speeds
above 30 km/h, the indicator lamp goes out
and Blind Spo tAssist is operational.
If av ehicl eisd etecte dwithi nt he monitoring
range of Blind Spo tAssist at speeds above
30 km/h ,warning lamp :on the corre-
sponding side lights up red .Thisw arning
always occurs when avehicl eenters the blind 258
Driving systemsDriving an
dparking

G
WARNING
The Lane Keeping Assist warning does not
return the vehicl etothe original lane. There is
ar isk of an accident.
Always steer, apply the brakes or accelerate
the vehicl eyourself, especially if Lane Keep-
ing Assist alerts you.
If you fail to adapt yourd riving style,Lane
Keeping Assist can neither reduce the risk of
an accident nor overrid ethe lawsofp hysics.
Lane Keeping Assist cannot take into account
road ,weather or traffic conditions. Lane
Keeping Assist is only an aid.Y ou are respon-
sibl efor the distance to the vehicl einfront,
for vehicl espeed, for braking in good time,
and for staying in lane.
Lane Keeping Assist does not keep yourv ehi-
cle in its lane.
The system may be impaired or may not func-
tion if:
R there is poor visibility, e.g. due to insuffi-
cient illumination of the road ,ordue 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 windscreen is dirty ,misted up, dam-
agedorc overed,for instance by asticker,
in the vicinity of the camera
R no or several, unclea rlane markings are
present for one lane ,e.g. in aconstruction
area
R the lane markings are worn away,d ark or
covered up, e.g. by dirt or snow
R the distance to the vehicl einfront is too
smal land the lane markings thus cannot be
detected
R the lane markings change quickly, e.g.
lane sbranch off, cross one another or
merge
R the road is narrow and winding
R there are highly variable shad econditions
on the road Activating Lane Keeping Assist
X Activate Lane Keeping Assist using the on-
board computer; to do so, select Standard
Standard
or Adaptive Adaptive (Ypage2 88).
If you drive at speeds above 60 km/h and
lane markings are detected, the lines in the
assistance graphic display (Y page286)
are show ningreen. Lane Keeping Assist is
read yfor use.
Standard
If Standard Standard is selected, no warning vibration
occurs if:
R you have switched on the turn signals. In
this case, the warnings are suppresse dfor
ac ertain period of time.
R ad riving safety system intervenes, such as
ABS, BAS or ESP ®
.
Adaptive
When Adaptive Adaptive is selected, no warning vibra-
tion occurs if:
R you have switched on the turn signals. In
this case, the warnings are suppresse dfor
ac ertain period of time.
R ad riving safety system intervenes, such as
ABS, BAS or ESP ®
.
R you accelerate hard ,e.g. kickdown.
R you brake hard.
R you steer actively, e.g. swerve to avoi dan
obstacl eorchange lane quickly.
R you cut the corner on asharp bend.
In order that you are warned only when nec-
essary and in good time if you cross the lane marking, the system detects certain condi-
tions and warns you accordingly.
The warning vibration occurs earlier if:
R you approach the outer lane marking on a
bend
R the road has very widel anes, e.g.amotor-
way
R the system detects soli dlane markings 260
Driving systemsDriving and parking

The warning vibration occurs later if:
R the road has narrow lanes
R you cut the corner on abend Active Driving Assistance package
General notes The Active Drivin
gAssistance package con-
sists of DISTRONIC PLUS (Y page 217), Active
Blind Spot Assist (Y page 261) and Active
Lane Keeping Assist (Y page 263).
Active Blind Spot Assist General notes
Active Blind Spot Assist monitors the areas
on either side of the vehicle that are not visi-
ble to the driver with two lateral, rear-facing
radar sensors. Awarning display in the exte-
rior mirrors draws your attention to vehicles
detected in the monitored area. If you then
switch on the corresponding turn signal to
change lanes, you will also receive avisual
and audibl ecollision warning. If arisk of side
impact is detected, corrective braking may
help you avoid acollision. Active Blind Spot
Assist evaluates the free space in the direc-
tion of travel and to the side before making a course-correcting brake application. For this,Active Blind Spot Assist uses the forward-
facing radar sensors.
Active Blind Spot Assist supports you from a
speed of approximately 30 km/h.
Important safety notes
Active Blind Spot Assist is only an aid and is
not asubstitute for attentive driving. G
WARNING
Active Blind Spot Assist does not react to
vehicles:
R overtaking too closely on the side, placing
them in the blind spot area
R if the differenc einthe speed of approach
and overtaking is too great As
aresult, Active Blind Spot Assist may nei-
ther give warnings nor intervene in such sit-
uations. There is arisk of an accident.
Always pay careful attention to the traffic sit- uation and maintain asafe distanc eatthe side
of the vehicle.
Radar sensors
The Active Blind Spot Assist radar sensors are integrated into the fronta nd rear bumpers
and behind acover in the radiator trim. Make
sure that the bumpers and the cover in the
radiator trim are free of dirt, ice or slush. The
rear sensors must not be covered, e.g. by
bicycle racks or overhangin gloads. Following
as evere impact or in the event of damage to
the bumpers, have the function of the radar
sensors checked at aqualified specialist
workshop. Active Blind Spot Assist may oth-
erwise no longer function properly.
Monitoring range G
WARNING
Active Blind Spot Assist does not detect all
traffic situations and road users. There is a
risk of an accident.
Always make sure that there is sufficient dis-
tancetot he side for other traffic or obstacles. Example: Saloon Driving systems
261Driving and parking Z

Activ
eBlind Spo tAssist monitors the area up
to 3.0 mbehind your vehicle and directly next
to your vehicle, as shown in the diagram.
The detection of vehicles may be impaired in the case of:
R dirt on the sensor sorobscured sensors
R poor visibility, e.g. due to rain, snow or
spray
Vehicles in the monitoring range will then be
indicated late or not at all.
Active Blind Spot Assist may not detec tnar-
row vehicles, such as motorcycles or bicy-
cles, or may only detec tthem too late.
If the lanes are narrow, vehicles driving in the
lane beyond the lane nexttoy our vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may be the case if ther eare vehicles at the edge of
their lane.
Due to the nature of the system:
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 long vehicles, for example lor-
ries, for aprolonged time
Warning display :
Warnin gdisplay
Active Blind Spot Assist is not active at
speeds below approximately 30 km/h. Vehi-
cles in the monitoring range are then not indi-
cated. If Active Blind Spot Assist is activated, indi-
cator lamp
:in the exterior mirror slights up
yellow up to aspeed of 30 km/h. At speeds
above 30 km/h, the indicator lamp goes out
and Active Blind Spot Assist is operational.
If av ehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
30 km/h, warning lamp :on the corre-
spondin gside lights up red. Awarning is
alway sissued when avehicle enters the mon-
itorin grange of Blind Spot Assist from behind
or from the side. When you overtake avehicle,
the warning only occur sifthe difference in
speed is less than 12 km/h.
The yellow indicator lamp goes out if reverse gear is engaged. Active Blind Spot Assist is
not operational.
The brightness of the warning lamps is auto-
matically adapted to the brightness of the
surroundings.
Visua land acoustic collision warning
If you switch on the turn signals to change
lanes and avehicle is detected in the side
monitoring range, you receive avisual and
acoustic collision warning. You then hear a
double warning tonea nd red warning lamp:
flashes. If the turn signal remains on, detec-
ted vehicles are indicated by the flashing of
red warning lamp :.There are no further
warning tones.
Course-correcting brak eapplication
If Active Blind Spot Assist detects arisk of a
side impact in the monitoring range, acourse-
correcting brake application is carried out.
This is designed to help you avoid acollision. G
WARNING
Ac ourse-correcting brake application cannot
alway spreven tacollision. There is arisk of an
accident.
Always steer ,brake or accelerat eyourself,
especially if Active Blind Spot Assist warns
you or makes acourse-correcting brake appli-
cation .Always maintain asafe distanc eatthe
sides. 262
Driving systemsDriving and parking

Example: Saloon
If ac ourse-correcting brake application
occurs, red warning lamp :flashe sinthe
exterio rmirror and adualw arning tone
sounds. In addition, display ;underlining
the dange rofasidec ollision appear sinthe
multifunctio ndisplay.
In ver yrarec ases, the system ma ymakean
inappropriate brake application. Acourse-
correcting brake applicatio nmaybe interrup-
ted at any time if yo ustee rsligh tlyint he
opposite direction or accelerate.
The course-correcting brake applicatio nis
availabl einthe speed range between
30 km/h and 200 km/h.
Either acourse-correcting brake application
appropriate to the driving situation, or none at all, ma yoccu rif:
R ther earevehicles or obstacles, e.g .crash
barriers ,onboths ides of your vehicle
R av ehicl eapproaches too closel yonthe
side
R yo uh avea dopt edasporty driving style with
high cornering speeds R
yo uc learly brake or accelerate
R ad riving safety system intervenes, such as
ESP ®
or PRE-SAFE ®
Brake
R ESP ®
is deactivated
R al os soft yrep ressure or adefective tyr eis
detected
Activatin gActiveB lind Spo tAssist
X Make sure tha tActive Blind Spo tAssist
(Y page 288 )isactivated in the on-board
computer.
X Turn the key to position 2in the ignition
lock.
Warning lamps :in the exterio rmirrors
light up red for approximatel y1.5 seconds
and then tur nyellow.
Towin gatrailer
If yo ucoupl eupa trailer, make sure tha tyou
have correctl yestablished the electrical con-
nection. Thi scan be accomplished by check-
ing the traile rlig hting. Active Blind Spo tAssist
is then deactivated .The indicator lamps in the
exterio rmirrors light up yellow and the
Active
Active Blind BlindSpot
SpotAssist
Assist not
notavaila‐
availa‐
ble whe ntowing atraile rSee Own‐
ble whe ntowing atraile rSee Own‐
er' sManual
er' sManual message appear sinthe multi-
functio ndisplay.
Activ eLaneK eeping Assist General notes
Active Lane Keeping Assist monitors the area
in front of your vehicl ebymeans of multi-
functio ncamera :at the top of the wind-
screen. Various different area stothe front, Driving systems
263Driving andparking Z

Alway
ssteer, brake or accelerate yourself,
especially if Active Lane Keeping Assist warns
yo uorm akes alan e-correcting brake appli-
cation. G
WARNING
Active Lane Keeping Assist onl ydetects traf-
fic conditions or roa dusers to alim ited
extent. In ver yrarec ases, the system may
make an inappropriate brake application, e.g. afte rintentionally driving ove rasolid lane
marking .There is ariskofana ccident.
An inappropriate brake applicatio nmaybe
interrupte datany time if yo ustee rslightly in
the opposite direction. Alway smakes uret hat
ther eiss ufficient distance to the side for
othe rtraffic or obstacles. Example: Saloon
If yo uleave your lane under certain circum-
stances, the vehicl ewillb rake briefl yonone
side .Thisisi ntende dtohelpy ou return the
vehicl etothe original lane.
If al an e-correcting brake applicatio noccurs,
display :appear sinthe multifunctio ndis-
play.
Al ane-correcting brake applicatio ncan be
made afte rdriving ove ralanem arking detec-
ted as being solid or broken. Before this, a
warning must have been issued by means of
intermittent vibratio nthroug hthe steering
wheel. In addition, alan ew ithl an em arkings
on both side smustbed etected.
In the cas eofabroken lane marking being
detected, alan e-correcting brake application
can onl ybemadeifav ehiclehasbeen detec- ted in the adjacent lane. The following vehi-
cle scan have an influence on brake applica-
tion: oncoming traffic, vehicles tha tare over-
taking and vehicles tha tare driving parallel to
your vehicle.
i Af
urthe rlan e-correcting brake applica-
tio nc an onl yoccu rafte ryourv ehicl ehas
returned to the original lane.
No lane-correcting brake applicatio noccurs
if:
R yo uc learly and activel ysteer, brake or
accelerate
R yo uc ut the corne ronasharp bend
R yo uh avea dopt edasporty driving style with
high cornering speed sorhighr ates of
acceleration
R yo uh aves witched on the turn signals
R ad riving safety system intervenes, such as
ESP ®
,P RE -SAFE ®
Brake or Active Blind
Spo tAssist
R ESP ®
is deactivated
R the transmission is not in position D
R on vehicles with atraile rtow hitch, the
electrical connectio ntothe traile rhas been
correctl yestablished
R an obstacle ha sbeend etecte dint he lane in
which yo uaredriving
R al ossoft yrep ressure or adefective tyre
ha sb eend etecte dand displayed
There is apossibility tha tthe Active Lane
Keeping Assist could misjudge the given traf-
fic situation. An inappropriate brake applica-
tio nm aybe interrupte datany time if:
R yo us tee rslightly in the opposite direction
R yo us witch on the turn signal
R yo uc learly brake or accelerate
Al ane-correcting brake applicatio nisinter-
rupte dautomaticall yif:
R ad riving safety system intervenes, such as
ESP ®
,P RE -SAFE ®
Brake or Active Blind
Spo tAssist
R lane marking sareno longe rdetected Driving systems
265Driving andparking Z

Activatin
gActive Lane Keeping Assist
X Activat eActiv eLaneK eepin gAssist using
th eo n-bo ard computer; to do so, select
Standard
Standard orAdaptive
Adaptive (Ypage 288).
If you driv eatspeeds abov e60km/ hand
lane markings are detected, th elines in the
assistance graphic display (Y page 286)
are shown in green .ActiveL aneK eeping
Assist is read yfor use.
If Standard
Standard is selected, no warning vibra-
tion occur sif:
R you have switched on th eturns ignals. In
this case, th ewarning sare suppressed
for acertai nperiod of time.
R ad riving safet ysystem intervenes, such
as ABS, BA SorESP®
.
When Adaptive
Adaptive is selected, no warning
vibration occur sif:
R you have switched on th eturns ignals. In
this case, th ewarning sare suppressed
for acertai nperiod of time.
R ad riving safet ysystem intervenes, such
as ABS, BA SorESP®
.
R you accelerate hard ,e.g.k ickdown.
R you brak ehard.
R you steer actively, e.g. swerve to avoi dan
obstacle or chang elane quickly.
R you cut th ecorner onashar pbend.
In order that you are warned only when nec-
essary and in good time if you cross th elane
marking, th esystem detect scertai ncondi-
tion sand warn syou accordingly.
The warning vibration occur searlier if:
R you approac hthe outer lane markin gona
bend
R ther oad has ver ywide lanes, e.g. amotor-
way
R thes ystem detect ssolid lane markings
The warning vibration occur slater if:
R ther oad has narrow lanes
R you cut th ecorner onabend Towing
atrailer
If you couple up atrailer ,makes ure that you
have correctly established th eelectrical con-
nection .This can be accomplished by check-
ing th etrailer lighting. Towin
gatrailer Important safety notes
G
WARNING
You could lose control of th evehicle/trailer
combination if it begins to swerve. The vehi-
cle/traile rcom bination could eve noverturn.
Ther eisar iskofana ccident.
On no accoun tshould you attemp tto
straighten out th evehicle/traile rcom bina-
tio nbyi ncreasing speed. Decrease your
spee dand do no tcountersteer. Brake if nec-
essary. G
WARNING
If th emaximum th epermissible load for acar-
rier system is exceeded, th ecarrier could
come loos efromt hevehicl eand endanger
other road users. Ther eisariskofana ccident
and injury.
Never excee dthe permissible noseweight
when usin gacarrier.
Exceedin gthe maximum permissible nose-
weigh tofthetrailer drawbar on th eball cou-
plin gm ay caus edamag etothefollowing:
R your vehicle
R thet railer
R theb all coupling
R trailer to whitch
The vehicle/traile rcom bination could
become unstable.
If th enoseweight used is lower than th emin-
imum permissible noseweight ,the vehicle/
trailer combination could also become unsta- ble. 266
Towin
gatrailerDriving and pa rking

X
Pull the ball coupling in the direction of the
arrow until it engages in avertical position.
Indicator lamp =goes out. The trailer
power socket is integrated in the ball cou-
pling and swivels out with it.
Saloon: indicator lamp ?goes out.
Estate: indicator lamp =goes out.
The multifunction display shows the
Trailer Trailer hitch
hitch Check
Checklock
lockmech.
mech. mes-
sage until the ball coupling is engaged.
X Remove the protective coverin gfrom the
ball coupling and store it in asafe place.
X Make sure that the ball of the ball coupling
is clean and greased.
HYBRID vehicles :make sure that you read
the "HYBRID" Supplement included in the
vehicle literature. Otherwise, you may not
recognise dangers. Coupling up
atrailer
X Make sure that the transmission is in posi-
tion P.
X Apply the parking brake.
X Position the trailer horizontally behind the
vehicle.
X Couple up the trailer.
X Establish the electric connection between
the vehicle and the trailer.
X Check that the trailer lighting system is
working.
Ac onnected trailer is only recognised when
the electrical connection is established
correctly and when the lighting system is
working properly. The function of other sys-
tems, such as ESP ®
,P ARKTRONIC and
Active Parking Assist also depends on this. Uncoupling
atrailer G
WARNING
If you uncouple atrailer with an engaged over-
run brake, you could trap your hand between the vehicle and the trailer drawbar. This poses
ar isk of injury.
Do not uncouple atrailer with an engaged
overrun brake. G
WARNING
Vehicles with level control:
If you disconnect the trailer cable, the vehicle is lowered. This can cause you or others to
become trapped between the vehicle body
and tyres, or underneat hthe vehicle. This
poses arisk of injury.
Make sure that no-one is in the immediate
vicinit yofthe wheel arch or underneat hthe
vehicle when disconnectin gthe trailer cable.
! Do not disconnect
atrailer with an
engaged overrun brake. Otherwise, your
vehicle could be damaged by the rebound- ing of the overrun brake.
X Make sure that the transmission is in posi-
tion P.
X Apply the parking brake.
X Secure the trailer against rolling away.
X Remove the trailer cable and decouple the
trailer. Folding in the ball coupling
G
WARNING
If you release the ball coupling or it does not
engage correctly when folding in, it will swing out. Within pivoting range of the ball coupling,
there is an increased risk of an accident and
injury.
Only release the ball coupling if the pivoting
range is unobstructed. Always make sure that the ball coupling engages when folding in.
X Place the protective coverin gonthe ball
coupling. 270
Towing
atrailerDriving and parking