Fu
nction of Active Brake Assi st Ac
tive Brake Assi stconsi sts of thefo llowing func‐
tions:
R Distance warning function
R Autonomous braking function
R Situation-dependent braking assis tance
Ac tive Brake Assi stcan help youto minimize the
ri sk of a collision with vehicles or pedestrians or
to reduce the ef fects of such a collision.
If Ac tive Brake Assi sthas de tected a risk of colli‐
sion, you will be warned visually and acousticall y.
If yo u do not react tothe visual or acoustic warn‐
ing, autonomous braking can be initiated in criti‐
cal situations.
If th ere are pedestrians and cyclists crossing: in
especially critical situations, Active Brake Assi st
can initiate au tonomous braking di rectl y.In this
case, the visual and acoustic warning occurs
simultaneously with the braking application.
If yo u apply the brake yourself in a critical situa‐
tion, or apply the brakes during autonomous
braking, situation-dependent braking assis tance
occu rs. The brake pressure increases up tomaxi‐
mum full-s top braking if necessar y.Situation-
dependent braking assis tance only inter venes
when the brakes are applied firm ly; otherwise, it
re mains within the autonomous braking process. &
WARNING Risk of accident caused by
limited de tection per form ance of Active
Brake Assi st
Ac tive Brake Assi stcannot al ways clea rly
identify objects and complex traf fic situa‐
tions. Due
tothe nature of the sy stem, complex
driving conditions may also cause Brake
Assist tointer vene or not inter vene wi thout
re ason. In such cases, and in theeve nt of
Ac tive Brake Assi stmalfunctioning, the brake
sy stem will continue tobe available with full
brake boost and BAS. #
Always pay careful attention tothe traf‐
fi c situation; do not relyonActive Brake
Assi stalone. Active Brake Assi stis only
an aid. The driver of theve hicle is
re sponsible forke eping a suf ficiently
safe dis tance totheve hicle in front, for
ve hicle speed and for braking in good
time. #
Be prepare dto brake or swer veif nec‐
essar y. Also obser
vethe sy stem limits of Active Brake
Assi st.
The individual subfunctions are available in
th efo llowing speed ranges:
Distance warning function
The dis tance warning function warnsyo u at
speeds greater than appr oximately 4 mph
(7 km/h), if your vehicle is critically close to a
ve hicle or pedestrian.
An intermittent warning tone sounds and the
00BA distance warning lamp lights up in the
instrument clus ter.
Brake immedia tely or take eva sive action, pr ovi‐
ded it is safe todo so and the tra ffic situation
allo ws th is.
The distance warning function can aid you in thefo llowing situations with an intermit tent wa rn‐
ing tone and a warning lamp: Ve
hicles tr avel‐
ing in front St
ationary vehi‐
cles Crossing
vehi‐
cles Crossing pedes‐
trians/cycli
stsSt
ationary
pedestrians
Up toappr ox.
15 5mph
(250 km/h) Up
toappr ox.
12 4mph
(200 km/h) No
reaction Uptoappr ox.
37 mph
(60 km/h) No
reaction Driving and parking
14 9
Sy
stem limitations
The sy stem may be impaired or may not function
in thefo llowing ins tances:
R The radar sensors are af fected bysno w,rain,
fo g, heavy spr ay,gl are, direct sunlight or
greatly varying ambient light.
R The radar sensors may malfunction in parking
ga rage s or on roads with steep uphill or
downhill gradients.
R Ifth era dar sensors are dirty or co vered.
R On icy or slippery roads, braking or accelerat‐
ing can cause the drive wheels tolose trac‐
tion and theve hicle could then skid.
R Stationary objects are not de tected if these
we renot pr eviously de tected as moving.
R On bends, target vehicles may be lost or not
re cognized cor rectl y.As a result, a target
ve hicle is not used toregulate the speed
which may lead tounwa nted accele ration.
Do not use Active Dis tance Assi stDISTRONIC in
th ese situations. &
WARNING Risk of accident from acceler‐
ation or braking byActive Dis tance Assi st
DISTRONIC
Ac tive Dis tance Assi stDISTRONIC may accel‐
erate or brake in thefo llowing cases, for
ex ample:
R Ifth eve hicle pulls away using Active Dis‐
ta nce Assi stDISTRONIC.
R Ifth estored speed is called up and is con‐
siderably faster or slo werth an the cur‐
re ntly driven speed.
R IfAc tive Dis tance Assi stDISTRONIC no
longer de tects a vehicle in front or does
not react toreleva nt objects. #
Always carefully obser vethe traf fic con‐
ditions and be ready tobrake at all
times. #
Take into account the tra ffic situation
before calling up thestored speed. &
WARNING Risk of accident due toinsuf‐
fi cient deceleration byActive Dis tance
Assi stDISTRONIC
Ac tive Dis tance Assi stDISTRONIC brakes
yo ur vehicle with up to50% of the maximum
possible deceleration. If this deceleration is not suf
ficient, Active Dis tance Assi st
DISTRONIC alerts you with a visual and
acoustic warning. #
Inthese cases, adjust your speed and
ke ep a suf ficient dis tance. #
Brake theve hicle yourself and/or take
ev asive action. &
WARNING Risk of accident if de tection
function of Active Dis tance Assi st
DISTRONIC is impaired
Ac tive Dis tance Assi stDISTRONIC does not
re act or has a limited reaction:
R when driving on a dif fere nt lane or when
ch anging lanes
R topedestrians, animals, bicycles or sta‐
tionary vehicles, or unexpected obs tacles
R tocomplex traf fic conditions
R tooncoming vehicles and crossing traf fic
As a result, Active Dis tance Assi stDISTRONIC
may nei ther give warnings nor inter vene in
su ch situations. #
Always obser vethe tra ffic conditions
carefully and react according ly. Ac
tive Dis tance Assi stDISTRONIC may not de tect
nar row vehicles driving in front, e.g. mo torcyc les
and vehicles driving on a dif fere nt line.
Ope rating Active Di stance Assist DIST RONIC
Re quirements:
R The vehicle has been star ted.
R The parking brake has been released.
R ESP ®
is activated and is not inter vening.
R The transmission is in position 005B.
R The driver's and the front-passen ger door are
closed.
R The seat occupancy recognition on the driv‐
er's seat has de tected that the driver has fas‐
te ned the seat belt.
R The check of thera dar sensor sy stem has
been successfully comple ted. Driving and parking
15 3
Sy
stem limitations
The 360° Camera will not function or will only
partially function in thefo llowing situations:
R The front doors are open.
R The side mir rors are folded in.
R There is heavy rain, snow or fog.
R The ambient light is poor, e.g. at night.
R The area is lit byfluorescent light (the displ ay
may flic ke r).
R Ifth ere is a sudden change in temp erature,
e.g. when driving into a heated garage in win‐
te r.
R The ambient temp erature is very high.
R The camera lens is obstructed, dirty or fogged
up.
R Cameras, or vehicle components in which the
came ras are ins talled, are damaged. In this
eve nt, ha vethe cameras, their positions and
th eir setting checked at a qualified specialist
wo rkshop.
Do not use the 360° Camera under such circum‐
st ances. You could otherwise injure others or col‐
lide with objects when parking theve hicle.
On vehicles with height-adjus table suspension or
if th eve hicle is car rying a heavy load, leaving the
st andard height can result in inaccuracies in the
guide lines and in the display of thege nerated
ima ges, depending on tech nical conditions.
The field of vision and other functions of the cam‐
era sy stem may be restricted due toadditional
attachments on theve hicle (e.g. loading tailgate).
% The contrast of
the display may be impaired
by abrupt direct sunlight or by other light
sources, e.g. when driving out of a garage . In
th is case, pay particular attention.
% Ha
ve the display repaired or replaced if, for
ex ample, pixel er rors considerably restrict its
use. The ima
gefrom the 360° Camera appears auto‐
matically in the multimedia sy stem when thefo l‐
lowing conditions are fulfilled:
R The ignition is switched on.
R The rear-end doors are opened.
This means that the area behind theve hicle can
be monitored.
When there ar-end doors are closed, the image
from there ar view camera is swit ched off af ter
appr oximately ten seconds.
See the no tes on cleaning the 360° Camera
(/ page 288).
Selecting a view for the 360° Came ra
Re quirements:
R The Auto. Rear View Cam. is activated inthe
multimedia sy stem (/ page161). #
Engage reve rsege ar. #
Select the desired view in the multimedia sys‐
te m.
Ac tivating/deactivating automatic ope ration
of the rear view camera
The rear view camera is only an aid. It is not a
substitute foryo u paying attention tothe sur‐
ro undings. You are alw aysre sponsible for safe
maneu vering, pa rking and exiting a parking
space. Make sure that no persons, animals or
objects etc. are in the path of your vehicle. Pay
attention toyour sur roundings and be ready to
brake at all times.
Multimedia sy stem:
4 © 5
Settings 5
Assistance
5 Camera & Parking #
Switch Auto. Rear View Cam. on or off.
Ac tivating/deactivating maneuvering assis‐
tance
Multimedia sy stem:
4 © 5
Settings 5
Assistance
5 Camera & Parking #
Switch Maneuvering Assistance on or off.
% When maneuvering assis tance is acti vated,
th efo llowing functions are active:
R Drive AwayAssi st (/ page 165)
R Rear Cross Traf fic Alert (/ page 166) Driving and parking
161
&
WARNING Risk of accident caused by
limited de tection per form ance of Drive
Aw ayAssi st
Drive AwayAssi stcannot al ways clea rly iden‐
tify objects and traf fic situations.
In such cases, Drive AwayAssi stmight:
R Warnyou without reason and limit the
ve hicle speed.
R Not warnyou or not limit theve hicle
speed. #
Always pay careful attention tothe traf‐
fi c situation; do not relyon Drive Away
Assi stalone. #
Be prepared tobrake or swer veas nec‐
essar y,prov ided the tra ffic situation
permits and that it is safe totake eva‐
sive action. Drive
Away Assistis only an aid. It is not a substi‐
tute foryo ur attention tothe sur roundings. Yo u
are alw aysre sponsible for safe maneu vering,
pa rking and exiting a parking space. Make sure
th at no persons, animals or objects etc. are in the
path of your vehicle.
A risk of a collision may arise in thefo llowing sit‐
uations, forex ample:
R Ifth e driver mixes up the accelerator and
brake pedals.
R Ifth e wrong gear is selec ted.
The Drive AwayAssi stfunction is active under the
fo llowing conditions:
R IfPa rking Assist PARKTRONIC is activated.
R Every time thege ar is changed to005E or005B
when theve hicle is at a standstill.
R Ifth e de tected obs tacle is less than appr ox‐
imately 3.3 ft(1.0 m) away.
R Ifth e maneuvering assis tance function is acti‐
va ted in the multimedia sy stem.
Sy stem limits
Drive AwayAssi stis una vailable on inclines and
when driving with a trailer. Re
ar Cross Traf fic Alert Fu
nction of Rear Cross Traf fic Alert
The radar sensors in the bumper are used forthe
sy stem. This wayth e area adjacent totheve hicle
is continually monitored. If thera dar sensors are obscured
byvehicles or other objects, de tection
is not possible.
% Also
read the no tes on Blind Spot Assist
(/ page 164).
Ve hicles with Blind Spot Assis t:drivers can
also be warned of any crossing tra ffic when back‐
ing up out of a parking space. If a vehicle is
de tected, thewa rning lamp in the outside mir ror
on the cor responding side lights up red. If it
de tects a critical situation, a warning tone also
sounds.
Ve hicles with Blind Spot Assist and Parking
Assist PARKTRONIC: drivers can also be warned
of any crossing tra ffic when backing up out of a
parking space. If a critical situation is de tected, a
wa rning symbol appears on the camera image of
th e multimedia sy stem. If the driver does not
re spond tothewa rning, theve hicle's brakes can
be applied automatically. In this case, a warning
to ne sounds.
The Rear Cross Traf fic Alert function is acti ve
under thefo llowing conditions:
R Blind Spot Assist is activated.
R Reversege ar is engaged or theve hicle is
backing up at walking pace.
R Ifth e maneuvering assis tance function is acti‐
va ted in the multimedia sy stem.
The Rear Cross Traf fic Alert function is una vaila‐
ble when driving with a trailer. Lane
Keeping Assist and Active Lane Keeping
Assist Fu
nctions of Lane Keeping Assist Lane
Keeping Assist monitors the area in front of
yo ur vehicle with multifunction camera 1. It16 6
Driving and pa rking
ser
vesto protect you against unin tentionally le av‐
ing your lane. You may also be warned by a
vibrating messa gefrom thesteering wheel and by
th est atus symbol flashing in the Instrument Dis‐
pla y.
The warning is issued when thefo llowing condi‐
tions are met at the same time:
R Lane Keeping Assist de tects lane markings.
R A front wheel drives over a lane marking.
Yo u can activate and deactivate the Lane Keeping
Assist warning.
If yo ufa ilto adapt your driving style, Lane Keep‐
ing Assist can neither reduce therisk of accident
nor override the la wsof ph ysics. It cannot take
into account road, weather or traf fic conditions.
Lane Keeping Assist is only an aid and is not
intended tokeep theve hicle in the lane without
th e driver's cooperation. You are responsible for
th e safe dis tance totheve hicle in front, forve hi‐
cle speed, braking in good time and forst ay ing in
yo ur lane.
Sy stem limits
The sy stem may be impaired or may not function
in thefo llowing situations:
R There is poor visibilit y,e.g. due toinsuf ficient
illumination of thero ad, if there are highly
va riable shade conditions or in rain, sno w,fog
or spr ay.
R Glare from oncoming traf fic, direct sunlight or
re flections.
R There is dirt on the windshield in the vicinity
of the multifunction camera or the camera is
fo gged up, damaged or obscured.
R No or se veral unclear lane markings are pres‐
ent for one lane, e.g. in a construction area.
R The lane markings are worn, dark or co vered.
R The dis tance totheve hicle driving in front is
to o short and thus the lane markings cann ot
be de tected.
R The lane markings change quickl y,e.g. lanes
branch off, cross one ano ther or mer ge.
R The road is very nar row and winding. Fu
nctions of Active Lane Keeping Assist Ac
tive Lane Keeping Assist monitors the area in
front of your vehicle bymeans of multifunction
camera 1. It ser vesto protect you against unin‐
te ntionally le aving your lane. You may also be
wa rned bya vibrating message from thesteering
wheel and bythest atus symbol flashing in the
instrument displa y.In addition, you may be gui‐
ded back into your lane bya lane-cor recting
brake application. A releva nt messa geappears in
th e instrument displa y.
The warning is issued when thefo llowing condi‐
tions are met at the same time:
R The driving sy stem de tects lane markings.
R A front wheel passes overth e lane markings.
A lane-cor recting brake application occu rswhen
th efo llowing conditions are me t:
R Active Lane Keeping Assist de tects lane
markings on bo thsides of theve hicle.
R A front wheel drives over a solid lane mark‐
ing.
A releva nt messa geappears in the instrument
displa y.
The brake application is available in the speed
ra nge between appr oximately 40 mph (60 km/h)
and 100mp h (1 60 km/h).
Yo u can either deactivate theAc tive Lane Keep‐
ing Assist warning or switch off the sy stem com‐
ple tely.
If yo ufa ilto adapt your driving style, Ac tive Lane
Ke eping Assist can neither reduce therisk of an
accident nor override the la wsof ph ysics. It can‐
not take into account road, weather or traf fic
conditions. The driving sy stem is an aid for when
yo u unin tentionally le aveor cross the lane and Driving and parking
167
not a sy
stem for automatically keeping tothe
lane. You are responsible forth e dis tance tothe
ve hicle in front, forve hicle speed, braking in good
time and forst ay ing in your lane. If a lane-cor
recting brake application from Active
Lane Keeping Assist occurs, display 1appears
in the multifunction displa y.
Sy stem limits
No lane-cor recting brake application from Active
Lane Keeping Assist occurs in thefo llowing situa‐
tions:
R You clearly and actively steer, brake or accel‐
erate.
R You swit chon the turn signal.
R A driving saf ety sy stem inter venes, su chas
ESP ®
or Active Brake Assi st.
R You ha veadop ted a sporty driving style with
high cornering speeds or high rates of accel‐
eration.
R ESP ®
has been switched off.
R When driving with a trailer, the electrical con‐
nection tothe trailer has been cor rectly
es tab lished.
R If a loss of tire pressure or a faulty tire has
been de tected and displa yed.
The sy stem may be impaired or may not function
in thefo llowing situations:
R There is poor visibilit y,e.g. due toinsuf ficient
illumination of thero ad, highly variable shade
conditions, or due torain, sno w,fog or heavy
spr ay.
R Glare from oncoming traf fic, direct sunlight or
re flections.
R There is dirt on the windshield in the vicinity
of the multifunction camera or the camera is
fo gged up, damaged or obscured.
R No or se veral unclear lane markings are pres‐
ent for one lane, e.g. in a construction area.
R The lane markings are worn, dark or co vered. R
The dis tance totheve hicle in front is too
small, and therefore the lane markings cann ot
be de tected.
R The lane markings change quickl y,e.g. lanes
branch off, cross one ano ther or mer ge.
R The roadw ayisvery nar row and winding.
Ac tivating/deactivating Lane Keeping Assist
or Active Lane Keeping Assist
Multimedia sy stem:
4 © 5
Settings 5
Assistance #
Select Lane Keeping Assist orAct. Lane
Keep Asst. On.
Ac tivating or deactivating the warning #
Select Lane Keeping Assist orAct. Lane
Keep Asst. On. #
Select Warning. Wo
rkmode ADR (working speed control)
Fu
nction of ADR (working speed control)
When activated, ADR automatically increases the
engine speed toa preset speed or a speed you
ha ve set.
% Af
ter a cold start, the idle speed of the
engine is increased automaticall y.Ifth e pre‐
set working speed is lo werth an the
inc reased idle speed, thewo rking speed is
only reached once the engine has comple ted
th ewa rm-up phase.
It is only possible toactivate ADR with the
ve hicle stationary and the parking brake
applied.
On vehicles with automatic transmission, the
selector le ver must be in position 005D. 16 8
Driving and pa rking
Coupling/uncoupling a trailer
Coupling a trailer
* NO
TEDama getotheve hicle battery due
to full discharge Charging
the trailer battery using the po wer
supply of the trailer can damage theve hicle
batter y. #
Do not use theve hicle's po wer supply
to charge the trailer batter y. #
Shift the selector le verto position 005D. #
Apply theve hicle's parking brake. #
Close all the doors. #
Position the trailer on a le vel sur face behind
th eve hicle.
% The ball head height
changes depending on
th eve hicle's load. In this case, use a trailer
with a height-adjus table trailer dr awbar. #
Couple up the trailer. #
Establish all electrical and other connections
to the trailer. #
Remo veobjects or devices which pr eventthe
trailer from rolling, e.g. wheel choc ks. #
Release the trailer's parking brake.
% The
vehicle harness has a cable connection
to the brake light indicator lamp.
Obser vethe maximum permissible trailer dimen‐
sions (width and length).
Most US states and all Canadian pr ovinces pre‐
scribe thefo llowing points, and you are ur gently
re commended tocomply wi th these:
R Safetych ains between theto wing vehicle and
th e trailer. The chains should be routed in a
criss-cross pat tern under the trailer dr awbar.
They must be connected tothe trailer tow
hitch and not tothe bumper or totheve hicle
axle.
Lea vesuf ficient sla ckinthech ains. This
allo wsforeve n sha rpcornering.
R A separate brake sy stem is requ ired for cer‐
ta in trailers.
R A saf etyfe ature is requ ired for braked trailers.
De term ine the specific requ irements acco rd‐
ing tothere leva nt la ws.
If th e trailer becomes de tach ed from theto w‐
ing vehicle, the saf etyfe ature triggers the
trailer brakes and can thus reduce the danger. Un
coupling a trailer &
WARNING Risk of being crushed and
becoming trapped when uncoupling a
trailer
When uncoupling a trailer wi than engaged
ine rtia-activated brake, your hand may
become trapped between theve hicle and the
trailer dr awbar. #
Do not uncouple trailers with an
engaged overrun brake. Do not uncouple a trailer with an
overrun brake in
a st ate of overrun. Otherwise, there bound of the
ove rrun brake can damage your vehicle. #
Shift the selector le verto position 005D. #
Apply theve hicle's parking brake. #
Close all the doors. #
Apply the trailer's parking brake. #
Secure the trailer against rolling away with a
wheel chock or similar object. #
Remo vethe trailer cables and saf etych ains. #
Uncou plethe trailer. Information about
towing a trailer Operating a trailer is subject
tomany statutory
re gulations such as speed restrictions.
Many states also requ ire an auxiliary separate
functional braking sy stem when towing a weight
th at exc eeds a cer tain limit. Foryo ur saf ety, it is
re commended touse a separate functional brak‐
ing sy stem on any towe dve hicle.
Make sure that your trailer combination meets
local regulations. This not only applies to your
place of residence, but also to your destination.
In fo rm ation on this can be obtained from the
police and local authorities.
Comply with thefo llowing when driving with a
trailer:
R Practice cornering, stopping and backing up
in a traf fic-free location. In this wa y,yo u will 17 2
Driving and pa rking
ga
in driving experience and become accus‐
to med tothe new handling characteristics.
R Before driving, check thefo llowing:
- that the trailer tow hit chand ball coupling
are secure
- that the saf ety swit chfor braked trailers is
functioning cor rectly
- that the saf etych ains are secure and
undamaged
- that the electrical connections are secure
- that the lights are functioning cor rectly
- the wheels for dama geand cor rect tire
pressure (/ page 308)
R Adjust the outside mir rors so that you ha ve a
clear view of there ar section of the trailer.
R Ifth e trailer is equipped with an individual
braking sy stem, check before each journey
whe ther the brakes are functioning cor rectl y.
R Ifth e trailer has electronically cont rolled
brakes, pull away carefully wi th theve hicle/
trailer combination. Brake manually using the
brake controller and check whe ther the
brakes are functioning cor rectl y.
R Secu rethe load on the trailer in line with the
re qu irements and rules for load-securing
me thods.
R When driving with a trailer, check at regular
inter vals that the load is secure and that the
lights and brakes are functioning cor rectl y.
R Bear in mind that the handling characteristics
are more uns table when towing a trailer than
when driving without a trailer. Avoid sudden
st eering mo vements.
R The vehicle/trailer combination is heavier,
accelerates more slowl y,has a reduced
climbing ability and an increased braking dis‐
ta nce. It is more susceptible toside winds
and requ ires careful steering.
R If possible, do not brake suddenl y,but rath er
moderately at firs t so that the trailer can acti‐
va te its brakes. Then inc rease the pressure on
th e brake pedal.
R Ifth e automatic transmission shifts between
ge ars on uphill or downhill gradients, restrict
th e shift range. Select shi ftrange 4, 3, 2 or 1.
A lo werge ar and reduced speed decrease the
ri sk of engine damage.
R When driving on a downhill gradient, shift to a
lo we rge ar to use the engine's braking ef fect. Av
oid cons tant braking, as this could cause
th eve hicle brakes and possibly also the
trailer brakes toove rheat.
R Ifth e coolant temp erature increases signifi‐
cant lywhen the air-conditioning sy stem is
switched on, switch the air-conditioning sys‐
te m off.
Coolant heat can also be dissipated by
switching the air flow and thete mp erature of
th e heater or air conditioning tothe maximum
le ve l. Open the windo wsif necessar y.
R When overtak ing, pay particular attention to
th e increased overtaking dis tance of your
ve hicle/trailer combination.
Due tothe length of your vehicle/trailer com‐
bination you will require a longer stre tch of
ro ad before swit ching back tothe original
lane. Pe
rm issible trailer loads and trailer dr awbar
nose weights We
ight information &
WARNING Risk of accident due to
unbraked trailer with excessively high
gross weight
If yo uto w a trailer without a separate func‐
tional braking sy stem and a gross trailer
we ight (G TW) of more than 1635 lbs (750 kg),
th en theve hicle brake sy stem may overheat.
This increases the braking dis tance and the
brake sy stem may even fail. #
Always use a trailer with a separate
functional braking sy stem when towing
a trailer with a gross trailerweight
(G TW ) of more than 1635 lbs (750 kg). *
NO
TEDama getothe drive train, trans‐
mission or trailer tow hit chdue toexc ess
gross combination weight The permissible
gross combinationweight is
exc eeded.
The drive train, the transmission or the trailer
to w hit chmay be dama ged. #
Comply with the permissible gross com‐
bination weight. Fo
rve hicles with a permissible gross vehicle
we ight of 11030 lbs (5003 kg),th e permissible
gross combination weight is less than the sum of Driving and parking
17 3