Page 192 of 446

System limitations
Either acourse-cor recting brak eappli cation
appropria teto thed riving situation ,ornonea t
all, ma yoccur in thef ollowing situations:
RTher earevehicles or obs tacles, e.g. crash
barr iers, on bo thsides of your vehicle.
RAv ehicle approaches tooc losel yont he side.
RYouh avea dop tedas porty driving stylew ith
high cornering speeds.
RYo uc lear ly brak eora ccelera te.
RAd riving safe ty system inter venes, such as
ESP®or ActiveB rake Assi st.
RESP®is deacti vated.
RTire pressur eloss or adefectiv etireh as
been de tected.
RWhe ndriving wi thatrailer ,the electrical con‐
nection tothet railer hitc hhas been cor rectly
es tablished. Ac
tivating/deactivatin gBlind Spo tAssis tor
Ac tiv eB lind Spo tAssis t
Multimedia sy stem:
,Vehicle.k Assistance.Blind
Spot Assist
#Ac tivate Oor deacti vate ª thef unction.
Ac tiv eL aneK eeping Assist
Function of Activ eL aneK eeping Assist
ActiveL aneK eeping Assis tmonitor sthe area in
front of your vehicle bymeans of multifunction
camera 1.Itserve stop rotect youa gains tunin‐
te ntional lyleavingy our lane. Youw ill be warned
by means of avibration in thes teering wheel
19 0
Driving and pa rking
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RYouh avea dop tedas porty driving stylew ith
high cornering speeds or high ratesofa ccel‐
eration.
RESP®is deactivated.
RWhen driving wit hatrailer, thee lectrical con‐
nection tothet railer has been cor rectly
es tablished.
RIfal oss of tir epressur eorad efectivetire
has been de tected and displ ayed.
The sy stem ma ybeimpaired or ma ynotfunction
in thef ollowing situations:
RTher eisp oor visibility, e.g. duetoinsuf ficient
illumination of ther oad, highly variable shade
conditions, or due torain, sno w,fogorh eavy
spr ay.
RTher eisg lare, e.g. from thes un, reflections
or oncoming tra ffic.
RTher eisd irtont he windshield in thev icinity
of them ultifunction camer aorthe camer ais
fo gged up, damaged or obscured.
RNo or se veral, unclear lane markings are
presentf or one lane, e.g. in aconstruction
area.
RThe lane markings ar eworn, dar korcovered.
RThe dis tance tothev ehicle in front is too
small and thel ane markings thus canno tbe
de tected.
RThe lane markings chang equickl y,e.g. lanes
branc hoff,c ross one ano ther or mer ge.
RThe road is very nar rowa nd winding.
Ve hicles with Drivin gAssistanc ePacka ge or
Driving Assistance Plus Package: ActiveL ane
Ke eping Assis tuses radar sensor stomonitor
se verala reas around thev ehicle. If ther adar
senso rs
inther ear bumper ar edirt
y or covered
wit hs now, thes ystemm aybe impaired or may
no tfunction .Ifano bstacle in thel ane in which
yo ua redrivin ghas been de tected, no lane-cor‐
re cting brak eappli cation occurs .
Ac tivatin gActive Lan eKeeping Assist
&
WARNING Risk of accident despite
wa rning from ActiveL aneK eeping Assist
Al ane-cor recting brak eappli cation cannot
al wa ys bring thev ehicle bac kintot he origi‐
nal lane.
#Alw ayss teer,b rake or accelera teyour‐
self,e speciall yifActiveLaneK eeping
Assis twarns youorm akesalane-cor‐
re cting brak eappli cation.
&
WARNING Risk of accident despite inter‐
ve ntio nofA ctiveLaneK eeping Assist
Ac tiveL aneK eeping Assis tdoes no tdetect
traf ficc onditions or road users. In very rare
cases, thes ystem ma ymakeani nappropri‐
at eb rake application, e.g. af teri ntentional ly
driving overas olidl ane marking.
The brak eapplication can be inter rupte dat
an yt ime if yous teer slightl yinthe opposite
direction.
#Alw aysm akes uret hat ther eiss uffi‐
cient dist ancetot he side foro ther traf‐
fi coro bstacles.
&
WARNING Risk of accident despite Lane
Ke eping Assist
Lane Keeping Assis tcannot alwaysc learly
de tect lane markings.
19 2
Driving and pa rking
Page 307 of 446

Rthee nergy supply or theo n-boar delectri‐
cal sy stem is malfunctioning.
When your vehicle is then towe da way,signif‐
icantly mor eeffor tm aybe requ iredtosteer
and brak ethan is normally required.
#Useatow bar.
#Mak esuret hat thes teering wheel can
mo vefreely ,befor etow ing thev ehicle
aw ay.
* NO
TEDama gedue to to wing away at
exc essivel yhigh speeds or overlong dis‐
ta nces
The driv etra in could be damaged when tow‐
ing at excessively high speeds or over long
dis tances.
#At ow ing speed of 31mp h(50 km/h)
mus tnotbe exc eeded.
#Atow ing dis tance of 31mile s(50 km)
mus tnotbe exc eeded.
Ifav ehicle mus tbetow st artedort owedaway,
its weight mus tnotexc eed thep ermissible gross
mass of thet ow ing vehicle.
&
WARNING Risk of accident whe ntow ing
av ehicle whic histoo heavy
If th ev ehicle being tow- star tedort owed
aw ay is heavier than thep ermissible gross
mass of your vehicle, thef ollowing situations
can occur:
RThe towing eyem aybecome de tach ed.
RThe vehicle/trailer combination may
swer veoreve noverturn.
#If ano ther vehicle is tow- star tedo r
to we da way,its weight mus tnotexc eed
th ep ermissible gross mass of your ow n
ve hicle.
#Information on thep ermissible gross mass of
th ev ehicle can be found on thev ehicle iden‐
tification plat e(
→page342). During
thet ow ing procedure, obser vethef ollow‐
ing:
RDeactivat ethe DISTRONIC dis tance pilot.
RDo no tactivate theH OLD function.
RVehicles with automatic transmission: Do
no to pen thed rive r's door or front passenger
door ,otherwise thea utomatic transmission
automaticall yshifts toposition j.
#Makesuret hat theb atter yisc onnected and
ch arge d.
When theb atter yisd ischar ged:
RThe engin ecann otbe star ted.
RThe elect ricp arkin gb rake canno tbe
re leased or applied.
RVe hicles with automatic transmission:
The au tomatic transmission canno tbeshif‐
te dtop osition iorj.
#Ins tallth et ow ing eye(→pag e307).
#Attach thet ow bar.
Breakdown assis tance 305
Page 373 of 446
Displaymessages
Possible causes/consequences and MSolutions
É
Drive More Slowly*Y
ou ar edriving toof astfor thes elected vehicle le vel.
#When adjustin gthe vehicle le vel,yo um ustn otdriv efastert han 50 mph(80 km/h).
#When adjusting thev ehicle le veld uring trailer operation ,you mus tnotdriv efastert han 19mp h(30 km/h).
É
Vehicl eRising *Y
our vehicle is adjusting tothel eve lyou ha veselected.
É
Compressor Is Cooling *D
uetofrequent le velc hanges within ashor tspaceoft ime,thec ompressor firs tn eeds tocool down in order toset
th es elected vehicle le vel.
#Driv eoninam anner appropriat efor thec urrent le vel. Mak esuret hat ther eiss ufficient ground clearance.
Whe nthe compressor has cooled down, thev ehicle continues rising tothes elected vehicle le vel.
Displa ymessages and warning/indicator lamps 37
1
Page 377 of 446

Displaymessages
Possible causes/consequences and MSolutions
Blind Spot Assist Not Avail-
able When Towing aTrailer
See Operator' sManual *W
hen youe stablish thee lectrical connection tothet railer ,Blind Spo tAssis tisu navailable.
#Press thel eft-hand side of Touc hC ontrol and confir mthe displa ymessage.
Blind Spot Assist Inopera-
tive *B
lind Spo tAssis tism alfunctioning.
#Visit aq ualified specialis tworks hop.
Active Blind Spot Assist
Currently Unavailable See
Operator's Manual *A
ctiv eBlind Spo tAssist istemp orarily una vailable.
The sy stem limits ha vebeen reached (
→pag e188).
#Driv eon.
When thec auses no longer appl y,thes ystemw ill be available again.
#Ifth ed ispla ymessag edoes no tdisappear ,pull ove rand stop thev ehicle while paying attention toroad and
traf ficc onditions and restar tt he engine.
Active Blind Spot Asst. Not
Available When Towing a
Trailer See Operator's Man-
ual *W
hen youe stablish thee lectrical connection tothet railer ,Activ eBlind Spo tAssistis una vailable.
#Press thel eft-hand side of Touc hC ontrol and confir mthe displa ymessage.
Active Blind Spot Assist
Inoperative *A
ctiveBlind Spo tAssist is malfunctioning.
#Visit aq ualified specialis tworks hop.
Displa ymessages and warning/indicator lamps 37
5