2021 MERCEDES-BENZ METRIS brake sensor

Legal
requirement sregarding thed isclosure
of data
If legall yrequired todo so, manufacturer sare,in
individual cases, legall yobliged toprov ide gov‐
ernmental entities ,upon requ esta nd tothe
ex tent requ ired, dat astore dbyt he manufacturer.
Fo re xamp le,this ma ybet he case during the
in ve stigation of acriminal of fense.
Go vernmental entities ar ethemselves, in individ‐
ual cases and within thea pplicable legal frame‐
wo rk,a uthorized toread out dat afromt hevehi‐
cle. In thec ase of an accident ,information that
can help wit haninvestigation can ,therefore, be
ta ke nf romt he airbag contro lunit ,for example.
Operational data in thev ehicle
Thi sisd atar egarding theo peration of thev ehi‐
cle, whic hhaveb een processed bycontrol units.
Thi sincludes thef ollowing data, fore xamp le:
R Vehicle status information suc hasthe speed,
longitudinal acceleration, lateral acceleration,
number of wheel revo lution sorthefast ened
seat belts display
R Ambien tconditions, suc hastemperature,
ra in sensor or dis tance sensor
Generally ,these ar evolatile dat aand will no tbe
st ored be yond thep eriod of operation but will
onl ybep rocessed within thev ehicle itself. Con‐
trol units, vehicle keys fore xamp le, of tenc ontain
da ta memories. Their use permits thet emporary
or permanent documentation of tech nica linfor‐
mation abou tthe vehicle's operating state, com‐
ponent loads, main tenance requirements and
te ch nica leventsorm alfunctions.
Dependin gonthetech nica lequ ipment, thef ol‐
lowing dat aarestored:
R Operating status of sy stem components, such
as fill le vels, tir epressur eorb atterystatus
R Malfunction sorfaults in impor tant sy stem
components, suc haslights or brakes
R System reaction sinspecial drivin gsituations,
suc hasa irbag deploymen torthe inter vention
of stabilit ycontrol sy stems
R Information on events in whic hthe vehicle is
damaged
In cer tain cases ,itmaybe requ ired tostor ed ata
th at wo uld ha veotherwise been temp orar y.This
ma ybet he case if thev ehicle has de tected a
malfunction, fore xamp le.
If yo uu se services, suc hasrepair services and
maintenanc ework, stored operational dat aaswe
ll as thev ehicle identification number can be
re ad out and used. The ycan be read out by
service networ kemp loye es, suc hasworks hops
and manufacturer sorthirdp arties ,suc has
breakdown services. The same is true in thec ase
of wa rrant yclaim sand quality assurance meas‐
ures.
In general ,the readout is per form ed via the
legall yprescribed por tfor thed iagnostics con‐
nection in thev ehicle. The operational dat athat
ar er ead out document tech nica lstatesoft he
ve hicle or of individual components and assis tin
th ed iagnosis of malfunctions, compliance with
wa rrant yobligations and quality impr ovement. To
th at end ,these data, in particular information
about component loads, tech nica levents, mal‐
functions and other faults ma ybetransmit ted
alon gwitht he vehicle identification number to
th em anufacturer .Inaddition, them anufacturer is
subject toproduct liability .For this reason ,the
manufacturer also uses operational dat afromt he
ve hicle, fore xamp le,forr ecalls. These dat acan
also be use dtoexamin ethe cus tomer's warranty
and guarantee claims.
Fa ult memories in thev ehicle can be rese tbya
service outle toratyourrequ estasp artofr epair
or maintenanc ework.
Con venience and inf otainmen tfunctions
Yo uc an stor ec onvenience settings and individual
settings in thev ehicle and chang eorr esetthem
at an ytime.
Dependin gonthevehicle equipment, this
includes thef ollowing settings ,for example:
R Seat and steering wheel positions
R Suspension and climat econt rols ettings
R Individual settings ,suc hasi nterior lighting
Depending on thes elected equipment, youc an
impor tdatai ntov ehicle inf otainment functions
yo urself.
Dependin gonthevehicle equipment, this
includes thef ollowing data, fore xamp le:
R Multimedi adata, suc hasmusic,films or pho‐
to sf or playbac kinanintegratedm ultimedia
sy stem
R Address book dat afor use in an integrated
hands-free sy stem or an integrated navigation
sy stem
R Ente redn avigation destinations
R Dataont he use of Interne tservices General no
tes21

Information on brakes
&
WARNING Risk of accident du etothe
brak esystem overheating
If yo ul eave your foot on theb rake pedal
when driving, theb rake system ma yoverheat.
This increases theb raking dis tance and the
brak esystemm ayeve nfail. #
Neveru se theb rake pedal as afootrest. #
Do no tdepress theb rake pedal and the
accelerator pedal at thes ame time
while driving. *
NO
TEWearing out theb rake linings by
continuously dep ressing theb rake pedal #
Do no tdepress theb rake pedal continu‐
ously whils tdriving. #
Touse theb raking ef fect of thee ngine,
shif ttoa lowe rgear in good time. Downhillg
radients
On long and steep downhill gradients yous hould
obse rvet he following instructions:
R invehicles wit hanautomatic transmission,
shif tdow ntos hiftranges 2or 1in good time
so that thee ngine is running at amediu mto
high engine speed (/ page106).
% Chang
ethe shif trang eing oodt ime when
cruise control is acti vated. Obser vethed riv‐
ing tips (/ page98).
Yo ut hereb ymakeu se of theb raking ef fect of the
engine and do no thave tobrak easo ften tomain‐
tai nt he speed. This relie vest he load on the
service brak eand pr events theb rake sf romo ver‐
heating and wearing tooq uickl y.
Heavy and light loads
If th eb rake sh ave been subjected toah eavy
load, do no tstopt he vehicle immediatel y.Drive
on foras hortwhile. The brakes cool down more
qu ickl yint he air flow.
If th eb rake sh ave been used onl ymoderately,
yo us houl doccasionall ytesttheir ef fectiveness.
To do this, brak emoref irml yfromah igherspeed
whil epaying attention tothet raffic conditions.
Th eb rake sw illg ripb ette rasar esult.
We troad sur faces
If yo uh ave been driving foral ong time in heavy
ra in without braking, ther em aybe adelayed
re sponse when youf irst apply theb rake s. This ma
yalso occur af terd riving thro ugh acarwa sh
or deep water.Yo um ustd epress theb rake pedal
mor efirml y.Maintai nagreater di stanc etot he
ve hicle in front.
While paying attention tothet raffic conditions,
yo us houl dbrake thev ehicle firm lyafte rd riving
on aw etroad sur face or thro ugh acarwa sh. This
heats theb rake discs so that they drym ore
qu ickl y,whic hprotects them agains tcorrosion.
Limited braking ef fect on salt-trea tedr oads:
R alayer of salt on theb rake discs or brakepads
can increase braking dis tances considerab ly,
or braking ma yhappen on onl yone side
R maintain an especiall ylarg esafed ista nce to
th ev ehicle in front
To remo vethel ayer of salt:
R appl ythe brakes from time totime ,paying
attention totraf ficc onditions
R carefully dep ress theb rake pedal at thee nd
of ajourne yand af tert he star tofan ewjour‐
ney
Checking theb rake pa dt hickness
In addition tomonitoring using theb rake pad wear
sensor ,regularly monitor and checka ll of the
brakepads byper form ing avisual inspection to
look form aterial wear on thep ads.
If yo ua reunabl etoc heckthe brakepad wear on
th ei nside of thew heels, remo vethew heels if
yo up ossess ther equired skills, or visit aqualified
specialis tworks hop.
If th eb rake pad material thickness is less than
0. 12 in (3 mm), ha vetheb rake pads checkeda nd
re placed at aqualified specialis tworks hop, if
necessar y.
Do no tsolely rely on theb rake pad wear sensor.
It is also strongly re commended that youh ave
th eb rake pads checkedataq ualified specialist
wo rkshop, no tonly at everyservice displa yedby
th em aintenanc einter vald ispla y,but also prior to
long journe ysand when everthe wheels are
re mo ved.
Chec kthe brakepads in thef ollowing cases:
R Ateve ryservice according tothem ainte‐
nanc einter val
R Befor elong journe ys
R Ateve rytirec hange
R Regular visual inspection fory our owns afety 100
Driving and pa rking

traf
fica nd inter vene if necessa ry.Bea wareofthe
limitation sregarding thes afeu se of these sys‐
te ms.
If yo uf ail toadap tyour driving style, thed riving
sy stems can neither reduce ther isk of accident
nor override thel aws of ph ysics. The road and
we ather condition saswell asthet raffic situation
canno talway sbet aken in toaccount. In
fo rm ation on vehicl esensor sand cameras Some driving and driving saf
etys ystems use
camera sand radar or ultrasonic sensor stomoni‐
to rt he area in front of, behind or next tothev ehi‐
cle. 1
Multifunction camera
2 Ultrasonic sensors
3 Rear vie wcamera
% Depending on
thev ehicle's equipment, the
ra dar sensor sareintegrated on thes ide of
th er ear bumper sand/or behin dthe
Mercedes star in ther adiator grill. &
WARNING Risk of accident du eto
re stricted de tection per form anc eofv ehi‐
cle sensor sand cameras
If th ea reaa round vehicle sensor sorcameras
is co vered, damaged or dirty ,certain driving
and saf etys yst ems cann otfunction cor rectly.
The reisar isk of an accident. #
Keep thea reaa round vehicle sensor sor
cameras clear of an yobstructions and
clean. #
Have damag etothe bumper ,radiator
grille or stone chipping in thea reaof th
ef ront and rear wind owsrepaired at a
qu alified specialis tworks hop. Ke
ep thea reas of thec amera sand sensor sfree
of dirt, ice and slush (/ page184). The sensors
and cameras and their de tection area smustn ot
be co vered. Do no tattac hadditional license plate
holders, advertisin gmedia, sticke rs,foils or stone
pr otection foils in thed etection rang eoft he sen‐
sor sand cameras. Ensur ethat no pr otru ding load
ex tends int othe de tection area.
In thee vent of damage, or following aseve re
impact ,have thef unction of thes ensor schec ked
at aq ualified specialis tworks hop. Ha vedamage
or stone chips in thea reaoft he cameras
re paired at aqualified specialis tworks hop. Overvie
wofdriving sy stems and driving
saf etys ystems In
this section, youw illfind information abou tthe
fo llowing driving sy stems and driving saf etys ys‐
te ms:
R ABS ( Anti-lock BrakingSystem)
(/ page111 )
R BAS(Bra ke Assist System) (/ page111 )
R ESP ®
(Ele ctronic Stability Program)
(/ page111 )
R EBD ( Electronic Brakeforce Distribution)
(/ page113 )
R ActiveB rake Assi st (/ pag e113 )
R Cruis econt rol(/pa ge115)
R ActiveD ista nce Assi stDISTRONIC
(/ page 116)
R Hill star ta ssis t(/pag e120)
R HOLD function (/ page121 )
R Parking Assis tPARKTRONIC (/ page 122)
R Rear vie wcamer a(/ pag e123)
R ActiveP arking Assis t(/pag e125)
R ATTENTION ASSIS T(/ pag e127)
R Blind Spo tAssis t(/pag e129)
R Lane Keeping Assis t(/pag e129) 11 0
Driving and pa rking

The dis
tance warning function warnsy ou in the
fo llowing situations:
R From aspeed of appr oximatel y4mph
(7 km/h), if your vehicle is critically close to a
ve hicle or pedestrian. An intermittent warning
to ne sounds and theL warning lam pin
th ei nstrument clus tert hen lights up.
Brak eimmediatel yortakee vasiv ea ction ,provi‐
ded it is saf etodosoa ndthet raffic situation
allo wsthis.
The dis tance warning function can aid youint he
fo llowing situations wit hanintermit tent wa rning
to ne and awarning lamp:
R Vehicles tr aveling in front: uptoappr ox‐
imatel y155 mph(250 km/h)
R Stationar yvehicles: uptoappr oximately
50 mph(80 km/h)
R Cros sing vehicles: noreaction
R Moving pedestrians/cyclists ahead: upto
appr oximately 50 mph(80 km/h)
R Crossing cyclists: uptoappr oximately
37 mph(60 km/h)
R Stationar ypedestrians: noreaction
Au tonomous braking function
The autonomous braking function ma yinter vene
at speed sstartin gf roma pproximately 4mph
(7 km/h) in thef ollowing situations:
R Vehicles tr aveling in front: uptoappr ox‐
imately 125m ph (200 km/h)
R Stationar yvehicles: uptoappr oximately
31 mp h(50 km/h)
R Cros sing vehicles: noreaction
R Cyclists ahead: uptoappr oximately 50 mph
(80 km/h)
R Moving pedestrians/crossing cyclists: up
to appr oximatel y37m ph (60 km/h)
R Stationar ypedestrians: noreaction
Situation-dependent brak eforce boosting
Situation-dependent brak eforce boosting may
inter vene at speed sstartin gf roma pproximately
4m ph (7 km/h) in thef ollowing situations:
R Vehicles tr aveling in front: uptoappr ox‐
imatel y155 mph(250 km/h)
R Stationar yvehicles: uptoappr oximately
50 mph(80 km/h)
R Cros sing vehicles: noreaction R
Cyclists ahead: uptoappr oximatel y50m ph
(80 km/h)
R Moving pedestrians/crossing cyclists: up
to appr oximately 37mph(60 km/h)
R Stationar ypedestrians: noreaction
Canceling abrake application of Activ eB rake
Assi st
Yo uc an cancel abrak eapplicatio nofActive
Brak eAssistat an ytimeb y:
R Fully depressin gthe accelerator pedal or with
kickdown.
R Releasing theb rake pedal.
Ac tiveB rake Assi stma ycancel theb rake applica‐
tion when one of thef ollowing condition sisfulfil‐
led:
R Youm aneuver toavo idtheo bstacle.
R Thereis no longer arisk of collision.
R An obs tacle is no longer de tected in front of
yo ur vehicle.
Sy stem limits
Fu ll sy stem per form anc eisn otavailable foraf ew
seconds af ters witching on thei gnition or af ter
driving off.
The sy stem ma ybeimpaired or ma ynotfunction
in thef ollowing situations:
R In sno w,rain, fogorh eavy spr ay.
R Ifth es ensor saredirty ,fogged up, damaged
or co vered.
R Ifth es ensor sareimpaired due tointer fer‐
ence from other radar sources, e.g. strong
ra dar reflection sinparking garage s.
R Ifal oss of tir epressur eoraf aulty tir ehas
been de tected and displa yed.
R In comple xtraffic situation swhere objects
canno talway sbec learly identified.
R If pedestrians or vehicles mo vequickl yinto
th es ensor de tection range.
R If pede strians ar ehidde nbyo ther objects.
R Ifth et ypical outline of apedestrian cann otbe
distinguished from theb ackg round.
R Ifap edestrian is no tdetected as such, e.g.
due tospecial clo thing or other objects.
R In cur vesw ithan arrow radius.
Fo llowing damag etothe front end of thev ehicle,
ha ve thec onfiguration and operation of ther adar
sensor checkedataq ualified specialis twork‐ 11 4
Driving and pa rking

Obser
vethen otes on driving sy stems and your
re sponsibility ,otherwise youc anno trecognize
danger s(/ page 109).
Sy stem limits
The sy stem ma ybeimpaired or ma ynotfunction
in thef ollowing ins tances, fore xamp le:
R in sn ow,rain, fogorh eavy spr ay
R ifth er eisd irtont heradar sensor sorthey
ar ec overed
R ifth er eisi nterfere nce from radar sources or
stro ngradar reflections, fore xamp le in park‐
ing garages
R in traf fics ituations whe refrequent speed
ch anges ar erequired, e.g. in heavy traf ficor
on winding roads or off- road
R onroads wit hsteep downhill or uphill gradi‐
ents
R on winding roads
The sy stem cann otdetect stationar yobjects
unles sthese wereprev iousl ydetected as moving.
In addition, on slipper yorslickr oads, braking or
accelerating can caus eone or se veraloft he drive
wheels tolose traction and thev ehicle can then
skid.
Do no tuse ActiveD ista nce Assi stDISTRONI Cin
th ese situations. &
WARNING Risk of accident from acceler‐
ation or braking byActiveD ista nce Assi st
DISTRONIC
Ac tiveD ista nce Assi stDISTRONI Cmayaccel‐
erat eorb rake inthef ollowing cases, for
ex ample:
R Ifth ev ehicle pulls away usin gActiv eDis‐
ta nce Assi stDISTRONIC.
R Ifth es tore ds peed is called up and is con‐
siderably faster or slo werthan thec ur‐
re ntly driven speed.
R IfAc tiveD ista nce Assi stDISTRONI Cno
longer de tects avehicle in front or does
no treact toreleva nt objects. #
Alwaysc arefully obser vethet raffic con‐
ditions an dbereadytobrak eata ll
times. #
Take intoa ccount thet raffic situation
befor ecallin gupt hestored speed. &
WARNING Risk of accident du etoinsuf‐
fi cient deceleration byActiveD ista nce
Assi stDISTRONIC
Ac tiveD ista nce Assi stDISTRONI Cbrakes
yo ur vehicle wit hupto5 0% ofthep ossible
deceleration. If this deceleration is no tsuffi‐
cient, ActiveD ista nce Assi stDISTRONIC
alerts youw ithav isualand acoustic warning. #
Adjus tyour speed and maintain asuita‐
ble dis tance from thev ehicle in front. #
Brak ethe vehicle yourself and/or take
ev asiv eaction. &
WARNING Risk of accident if de tection
function of ActiveD istan ce Assi st
DISTRONI Cisimpaired
Ac tiveD ista nce Assi stDISTRONI Cdoesn ot
re act or has alimited reaction:
R when drivin gonadiffe re nt lane or when
ch anging lanes
R topedestrians, animals, bicycles or sta‐
tionar yvehicles, or unexpected obs tacles
R tocomple xtraffic conditions
R tooncomin gvehicles and crossing traf fic
As aresult, ActiveD ista nce Assi stDISTRONIC
ma yneith er giv ewarnings nor inter vene in
su ch situations. #
Alwayso bser vethet raffic conditions
carefull yand react according ly. Ac
tiveD ista nce Assi stDISTRONI Cmaynotd etect
nar row vehicles driving in front, e.g. mo torcyc les
or vehicles no ttrave ling in line wit hyour vehicle.
Operating Activ eD ista nce Assis tDISTRONIC
Re quirements
R The vehicle has been star ted. It ma ytakeup
to twom inutes of driving be fore ActiveD is‐
ta nce Assi stDISTRONI Cisready foru se.
R The parking brak ehas been released.
R ESP ®
is activated and is no tinter vening.
R ActiveP arking Assis tisnotactivated.
R The transmissio nisinposition005B.
R The door sand tailgate/rear-en ddoor sare
closed.
R The driver's seat belt is fastened. Driving and parking
117

To
avo id damag etothevehicle, follo wt he
instructions forc leaning and car eofthefollowing
ve hicle parts:
Wheels and rims
R Use watera nd acid-free alloy wheel cleaner.
R Do no tuse acidic allo ywheel cleaner sto
re mo vebrak edust. Otherwise, wheel bolts
and brak ecomponents could be damaged.
R Toavo id cor rosion of brak ediscs and brake‐
pads, driv efor afew minutes af terc leaning
befor eparking thev ehicle. The brak ediscs
and brakepads warm up and dr yout.
Wi ndo ws
R Clean thew indo wsinside and outsid ewitha
dam pcloth and wit hacleaning agent recom‐
mende dfor Mercedes-Benz.
R Do no tuse dr ycloth sora brasiv eorsolvent-
based cleaning agents toclea nthe inside of
windo ws.
Wi per blades
R Carefully clea nthe folded-a wayw iper blades
wit had ampcloth.
R Fold wiper ar mawayfromt herear wind ow
( / pag e87).
R Do no tclean thew iper blades tooo ften.
Exterior lighting
R Clean thec oversw ithaw etspong eand mild
cleaning agent, e.g .car sha mpoo.
R Onlyuse cleaning agents or clo thss uitable
fo rp last ic co vers.
Sensors R Clean thes ensor sinthe front and rear bump‐
er sw ithas oftc loth and car shampoo
(/ page110).
R When using apowe rwashe r,ke ep am inimum
dis tance of 12in (30 cm).
Re ar vie wcamera
R Vehicles with atailgate: switc hont he igni‐
tion and shif tthe transmission tothe 005Eposi‐
tion toopen thec amera co verw hen the
engine is switched of f(/pag e110).
R Usec lean wate rand asoftc loth toclea nthe
camer alens.
R Do no tuse ap owe rwashe r. Sliding door
R Remo vefore ign object sfromt he vicinity of
th ec ontact plates and contact pins of the
sliding door.
R Cleant he contact plates and contact pins
wit ham ild cleaning agent and asoftc loth.
R Do no toilor grease thec ontact plates and
th ec ontact pins.
Ta ilpipes
R Clean wit hacleanin gagent recommended for
Mercedes-Benz, especially in thew inter and
af te rw ashing thev ehicle.
R Do no tuse acidic cleaning agents.
Tr aile rhitch
Obse rvet he no tesonc areint he trailer hitch
manufacturer's operating instructions. Note
soni nterior care &
WARNING Risk of inju ryfrom pla stic
parts breakin goffafte rt he use of sol‐
ve nt-based care products
Ca reand cleaning products con tainin gsol‐
ve nts can cause su rfaces in thec ockpit to
become porous. When thea irbags are
deplo yed, plastic parts ma ybreak away. #
Do no tuse anyc areorc leaning prod‐
ucts containing sol vents toclea nthe
cockpit. &
WARNING Risk of inju ryor deat hfrom
bleached seat belts
Bleaching or dyeing seat belts can se verely
we aken them.
This can, fore xamp le, cause seat belt stotear
or fail in an accident. #
Neverb lea ch or dy eseat belts. To
avo id damag etothevehicle, obser vethef ol‐
lowing instructions forc leaning and care:
Seat belts
R Clean wit hlukewa rmsoap ywater.
R Do no tuse chemical cleaning agents.
R Do no tdryby heating abo ve176°F( 80 °C)
or in direct sunlight. Maintenance and care
18 5

#
Avoid obs tacles or driv eoverthem with
particular care. #
Reduce speed when driving overcurbs,
speed bumps, manhol ecoversa nd pot‐
holes. #
Avoid especially high curbs. *
NO
TEDama getoelectronic component
parts thro ugh theu se of tire-ins talling
to ols Ve
hicles with atirep ressur emonitoring
sy stem: ther ea reelectronic component
parts in thew heel. Tire -ins talling tools should
no tbea pplied in thea reaoft hevalve.
Otherwise, thee lectronic componen tparts
could be damaged. #
Alwaysh ave tires changed at aqualified
specialis tworks hop. Ac
cessories that ar enotappr ovedfor your vehi‐
cle byMercedes-Benz, or ar enotbeing used cor‐
re ctly ,can impair ope rating sa fety.
Befor epurch asing and using non-appr oved
accesso ries, visit aqualified specialis tworks hop
and inquir eabout:
R Suitability
R Legal stipulations
R Factor yrecommendations
Obser vethef ollowing points when selecting,
ins talling and replacing tires:
R Use onl ytires and wheels of thes ame type,
design (winter tires, all-season tires) and
make.
R Onlyins tall wheels of thes ame size and tread
design on one axle (lef tand right).
It is onl ypermissible toins tallad iffe re nt
wheel size tothis in thee vent of aflat tir ein
order todriv etot he specialis tworks hop.
R Onlyins tall tires of thec orrect size ont othe
wheels.
R Ve
hicles with atirep ressur emonitoring
sy stem: all ins talled wheels mus tbeequip‐
ped wit hfunctioning sensor sfor thet irep res‐
sur em onitoring sy stem.
R Attemp eratures belo w50°F (10°C) use win‐
te rt ires or all-season tires wit hthe M+S
marking on all wheels. Wi
nter tires bearing the004D snowflak esym‐
bol in addition totheM +S marking pr ovide
th eb estp ossible grip in wintr yroad condi‐
tions.
R Only use tires wit hthe same tread.
R Obser vethem aximum permissible speed for
th ei nstalled tires.
If th is is belo wthe vehicle's maximum per‐
missible speed, this mus tbeindicated in an
appropriat elabel in thed rive r's field of vision.
R Break in ne wtires at moderat espeeds fort he
fi rs t60m iles (100 km).
R Replace thet ires af ters ixyearsatt he latest,
re ga rdless of wear.
Fo rm orei nformation on wheels and tires, con‐
ta ct aq ualified specialis tworks hop.
Be sur etoalso obse rvet he following fur ther rela‐
te ds ubjects:
R Notesont irep ressur e(/pag e206)
R Tire and Loadin gInforma tionp lacard
R Tire size designation, load-beari ng capacity,
speed rating and load ind ex (/pag e213 )
R Tire pressur etable
R Notesont he emer gency spa rewheel
(/ page222) Note
sonc hanging wheels &
WARNING Risk of inju rythro ugh dif fer‐
ent whee lsizes
Inter changing thef ront and rear wheels if the
wheels or tires ha vediffere nt dimensions may
se verely impair thed riving characteristics.
The wheel brakes or wheel suspension com‐
ponent smayalso be damaged. #
Rotate front and rear wheels onl yifthe
wheels and tires ar eofthe same dimen‐
sions. On
vehicles that ha vethes ame size front and
re ar wheels ,rotatet he wheels according tothe
inter vals in thet irem anufacturer's warrant ybook
in your vehicle documents. If this is no tavailable,
ro tate thet ires every3,000 (5,000) to
6,000 mile s(10 ,000 km) ,depending on the
degree of wear.E nsuret hat thed irection of rota‐
tio nism aintained. Wheel
sand tires 217

Displa
ymessages
Possible causes/consequences and 0050 0050Solutions
Active Distance Assist
---m ph *A
nactivatio nc ondition forA ctiv eDista nce Assi stDISTRONI Chas
no tb eenf ulfilled. #
Comply withthe activation conditions forA ctiv eDistan ce Assi st
DISTRONI C(/pa ge116).
Active Distance Assist
Off *A
ctiv eDista nce Assi stDISTRONI Chasbeen deacti vated
( / pag e116).
In thee vent of adeacti vatio nn otinitia tedbyt he driver ,awarning
to ne sounds as well.
Activ eDistanc eAssist
Inoperative *A
warning tone also sounds. ActiveD ista nce Assi stDISTRONI Cis
malfunctioning .Inaddition, BASm ayhave failed. #
Consult aqualified specialis tworks hop.
Active Distance Assist
and Limiter Inoperative *A
warning tone also sounds. ActiveD ista nce Assi stDISTRONI Cand
th el imiter ar emalfunctioning. #
Consult aqualified specialis tworks hop.
Act.D istance Assist Sus-
pended *Y
ou ar eaccelerating. ActiveD istan ce Assi stDISTRONI Cdoesn ot
inter vene fort he duration of thea cceleration process. #
Remo veyour foot from thea ccelerator pedal.
Ac tiveD istan ce Assi stDISTRONI Cwillbea ctivateda gain.
Active Distance Assist
Curr. Unavailable See
Oper. Manual *A
warning tone also sounds.
Ac tiveD ista nce Assi stDISTRONI Chasbeen switched of fand is
te mp orarily non-operational.
The following causes ar epossible:
R The function is impaired due toheavy rain or sno w.
R The radar sensor sy stem is temp orarily non-operational, e.g. due
to electromagnetic radiation close toTV orradio transmitting
st ations or other sources of radiation.
R The sy stem is outside theo perating temp eratur erange.
R Theo n-board electrica lsyst em voltag eist oo lo w.
If th ec auses mentioned abo veno longer apply ,the displa ymessage
will disappear and ActiveD istan ce Assi stDISTRONI Cwillbeo pera‐
tional again.
If th ed ispla ymessag edoes no tdisappear: #
Stop in accordance wit hthe tra ffic conditions. #
Secur ethe vehicle agains trolling away.
Active Brake Assist Sys-
tem Inoperative *A
ctiveBrake Assi stis una vailable due toam alfunction. #
Consult aqualified specialis tworks hop.
Active Brake Assist Cur-
rently Unavail. *A
ctiv eBrake Assi stistemp orarily non-operational.
The following causes ar epossible:
R The sensor sinthe front bumper ar edirty.
R The function is impaired due toheavy rain or sno w.
R The radar sensor sy stem is temp orarily non-operational, e.g. due
to electromagnetic radiation close toTV orradio transmitting
st ations or other sources of radiation. Displa
ymessages and warning and indicator lamps 249