2021 MERCEDES-BENZ METRIS sensor

#
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

Lo
weri ngthev ehicle af teraw heelchange &
WARNING Risk of accident du etoincor‐
re ct tigh tening torque
Th ew heel scould come loose if thew heel
bolts or wheel nuts ar enottightened tothe
prescribed torque. #
Ensu rethat thew heel bolts or wheel
nuts ar etightened tothep rescribed
tightening torque. #
Ifyo ua renots ure, do no tmovet he
ve hicle. Contact aqualified specialist
wo rkshop and ha vethet ightening tor‐
qu ec hec kedi mmediately. Re
quirements:
R The ne wwheel has been ins talled
(/ page220). #
Place thea dap tera nd ther atche tonthe hex‐
agon head nut of thej acks ucht hat thel ette r‐
ing AB/DOWN is visible. #
Tolowe rthe vehicle: turnthe ratche toft he
jac kc ounter-clo ckwise. #
Steel wheels: tightent he wheel bolts or
wheel nuts evenly in acrosswise patter nin
th es equence indicated (1 to5 )and to a
maximu mof200 Nm. #
Alloy wheels: tightenthew heel bolts or
wheel nuts evenly in acrosswise patter nin
th es equence indicated (1 to5 )and to a
maximu mof180 Nm. #
Che ckthet irep ressur eoft he newl yins talled
wheel and adjus titifnecessar y.
Ve hicles with thet irep ressur emonitor sys‐
te m: allins talled wheels mus tbeequipped with
functioning sensors. #
Retighten thew heel bolts tothes pecified
tightening torque af tert he vehicle has been
driven 31miles (50 km). %
When using
awhee lors parew hee lwitha
ne worn ewly painted disk wheel, ha vethe
wheel bolt sorwheel nut sretightene dagain
af te ra pproxima tely 62 1to3 ,107 miles
(1,000 to5,000 km) .Obser vethes pecified
tightening torque. Infor
matio nonw heeland tir ecom binations
Gene raln otes
Re treade dtires ar enotcheckeda nd recommen‐
ded byMercedes-Benzasitisn otalw aysp ossi‐
ble todetect pr evious damag eafter retreading.
Fo rthis reason ,Mercedes-Ben zcanno tguarantee
th eir driving saf ety. Do no tuse used tires when
th eir pr evious usag eisunknown.
Fo rs afet yr easons, Mercedes-Benz recommends
th at youo nlyu se tires, wheel sand accesso ries
whic hhaveb een appr ovedbyM ercedes-Benzf or
yo ur vehicle.
These tires ha vebeen speciall yadap tedf or use
wit hd riving saf etys ystems, suc hasABS or
ESP ®
.
Onl yuse tires, wheels and accessories that ha ve
been checkeda nd recommended byMercedes-
Benz.C ertain characteristics, suc hashandling,
ve hicle noise emissions, fuel consum ption, etc.
ma yotherwise be adversely af fected. Other
wheel size smaycause thet ires tocome int ocon‐
ta ct wi th thevehicle body and axle components
when under load. This ma yresult in damag eto
th et ireort hevehicle.
Mercedes-Benzisn otresponsible fora ny dama ge
caused byusin gtires, wheel soraccesso ries
ot her than those recommended.
Information on tires, wheels and permissible
combinations can be obtained at aqualified spe‐
cialis tworks hop.
The smaller thec ross-section of atireofas pe‐
cific wheel size, thew orse thed riving comfor ton
poor road sur faces. Ride and da mping com fort
ar er educed and ther isk increases that when you
driv eovero bstacles ,dam agetow heels and tires
ma yresult.
If yo uc hang ewheel siz eonyourvehicle, checkit
is assigned tothec orrect wheel size catego ry
( / pag e218). If thea ssignmen tchanges without
re coding thec ont rolu nit sint hevehicle, the
speedome terw illn ot displa ythe speed accu‐
ra tely.D riving safety sy stems and driving sy stems
ma ythen be operationally impaired or ma ydetect
am alfunction and switc hthemselves off. Wheels and tires
221

re
placed wit hastandar dwheel as soon
as possible. #
Neverins tall mor ethan one emergency
spar ewheel. #
When operating your vehicle wit hthe
emergency spar ewheel ins talled, adapt
yo ur drivin gstyle acco rdingly and drive
carefully. #
Do no tswitc hoffESP ®
. #
Sno wchains mus tnotbe ins talled on
th ee mer gency spa rewheel. #
Replace thee mer gency spa rewheel
af te ram aximu mofs ixyears, rega rd‐
less of wear. R
When usin ganemergency spa rewheel
(whic hisd iffe re nt from thew heel tobe
re placed) atop speed of 50 mph(80 km/h)
mus tnotbe exc eeded.
R The tir epressur eoft he emergency spare
whee lmustbec heckedb efor estartin gaj our‐
ne y.
R Have thee mer gency spa rewheel replaced by
aq ualified specialis tworks hop.
The following should be checkedr egular ly,p artic‐
ular lyprior tolong journe ys:
R thes ecur epositioning of thes par etire
R thet irep ressur eoft he spar ewheel (adjust
th et irep ressur eifn ecessary) (/ page207)
R thef astenings of thes par ew heel brac ket
The spar ewheel is located either on thel eftin
th er ear compartment or in aspar ew heel brac ket
unde rthe vehicle.
Re place thet ires af ters ixyearsatt he latest,
re ga rdless of wear.T his also applies tothes pare
wheel.
% If
yo uh ave installed an emer gency spa re
wheel or spar ewheel, thet irep ressur emoni‐
to rw illn ot function fort his wheel.T he emer‐
ge ncy spa rewheel or spar ewheel is not
equipped wit hasensor form onitoring tire
pressu re. Installing/removing
thes pare wheel Re
moving the spar ewheel in the rear com‐
partment #
Take auxiliar ytool 3and lug wrench 2out
of thev ehicle tool kit . #
Open thet ailgate/rear-en ddoor. #
Attach auxiliar ytool 3tolug wrench 2. #
Unscr ewtheb olt in them iddle of thew heel
wit hlug wrench 2and attached auxiliary
to ol 3. #
Remo vespar ewheel brac ket4. #
Remo vethew heel from spar ewheel brac ket
1 .
Installin gthe spar ewheel in ther ear com‐
partment #
Take auxiliar ytool 3and lug wrench 2out
of thev ehicle tool kit . #
Place thew heel ont ospar ew heel brac ket1
in thew heel ar ch. #
Screw ontheb olt along wit hspar ew heel
brac ket4.Todos o, use lug wrench 2with
attached auxiliar ytool 3. #
Tighten theb olt using lug wrench 2and
attached auxiliar ytool 3. #
Stow auxiliar ytool 3and lug wrench 2in
th ev ehicle tool kit. #
Close thet ailgate/rear-en ddoor. Wheels and tires
223

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

Displa
ymessages
Possible causes/consequences and 0050 0050Solutions
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 ActiveB rake Assi stwill be operational again.
If th ed ispla ymessag edoes no tdisappear: #
Stop in accordance wit hthe tra ffic conditions. #
Secur ethe vehicle agains trolling away. #
Switc hoffthee ngine. #
Clean thes ensor sinthe front bumper (/ page184). #
Restar tt he engine.
Active Distance Assist
Now Available *A
ctiv eDista nce Assi stDISTRONI Cisoperationa laga in following
te mp orar ynon- availabilit y.Yo uc an no wswitch ActiveD ista nce
Assi stDISTRONI Conagain ( / page 117, 119).
Cruise Control ---mph *A
nactivatio nc ondition forc ruisec ontrol has no tbeen met.
Fo re xamp le,youa reaimin gtos tore as peed belo w20m ph
(30 km/h). #
If conditions permit, driv eataspeed greater than 20 mph
(30 km/h) and stor et he speed. #
Obser vethea ctivation conditions forc ruisec ontrol
(/ page115).
Cruise Control and Lim-
iter Inoperative *A
warning tone also sounds. Cruise control and thel imiter ar emal‐
functioning. #
Visit aq ualified specialis tworks hop.
Blind Spot Assist Inoper-
ative *B
lind Spo tAssis tism alfunctioning. #
Consult aqualified specialis tworks hop.
Blind Spot Assist Cur-
rently Unavail. See Oper-
ator's Manual *B
lind Spo tAssis tist emporarily non-operational.
The following causes ar epossible:
R Youh ave couple dupat railer.
R The senso rsinther ear bumper ar edirty.
R The function is impaired due toheavy rain or sno w.
R The radar sensor sy stem is temp oraril ynon-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.
If th ec auses mentioned abo veno longer apply ,the displa ymessage
will disappear and Lane Keeping Assis twill be operational again.
If th ed ispla ymessag edoes no tdisappear: #
Stop in accordance wit hthe tra ffic conditions. #
Secur ethe vehicle agains trolling away. #
Switc hoffthee ngine. #
Clean thes ensor sintherear bumper (/ page184). #
Restar tt he engine. 250
Displa ymessages and warning and indicator lamps

Displa
ymessages
Possible causes/consequences and 0050 0050Solutions &
WARNING Risk of an accident du etoinsufficient tir epres‐
sure
R The tires can bu rst.
R The tires can wearexc essivel yand/or une venly.
R The driving characteristic saswell asthes teering and brak‐
ing ma ybegreatl yimp aired.
Yo uc oul dthen lose contro lofthevehicle. #
Obser vether ecommended tir epressu res. #
Adjus tthe tir epressur eifn ecessar y. #
Stop thev ehicle without steering or braking suddenl y.Pa ya tten‐
tion tothet raffic conditions. #
Secur ethe vehicle agains trolling away. #
Chec kthe tires. If necessar y,replace thew heel (/ page218). #
Che ckthet irep ressure. Cor rect thet irep ressur easn ecessar y.
Warning Tire Malfunction *T
he tir epressur eino ne or mor etires has dropped suddenl y. &
WARNING Risk of an accident from driving wi thaflat tire
R The tires can overheat and cause afire.
R The driving characteristic saswell asthes teering and brak‐
ing ma ybegreatl yimp aired.
Yo uc oul dthen lose contro lofthevehicle. #
Do no tdrive on wit haflat tire. #
Obser vethen otes on flat tires. #
Stop thev ehicle without steering or braking suddenl y.Pa ya tten‐
tion tothet raffic conditions. #
Secur ethe vehicle agains trolling away. #
Chec kthe tires. If necessar y,replace thew heel (/ page218).
Tire Press. Monitor Cur-
rently Unavail. *D
uetoas ource of radio inter fere nce, no signal sfromt he tir epres‐
sur esensor sarebeing received. The tir epressur emonitoring sys‐
te mist emporaril ymalfunctioning.
The tir epressur emonitoring sy stem restarts automaticall yassoon
as thec ause has been rectified.
Wheel Sensor(s) Missing *T
her eisnos ignal from thet irep ressur esensor of at leas tone tire.
The displa yisnotshowing an ypressur evalue fort he tir einq ues‐
tion. #
Have thef aulty tir epressur esensor replaced at aqualified spe‐
cialis tworks hop.
Tire Pressure Monitor
Inoperative No Wheel
Sensors *T
he wheels ins talled do no thave suitable tir epressur esensors. The
tir ep ressur emonitoring sy stem is deactivated. #
Equip wheels wit hsuitable tir epressur esensors.
The tir epressur emonitoring sy stem switches on af teraf ew
minutes of driving. 256
Displa ymessages and warning and indicator lamps

Displa
ymessages
Possible causes/consequences and 0050 0050Solutions
Tire Press. Monito rInop-
erative *T
he tir epressur emonitoring sy stem is malfunctioning and switched
off. Either thew heels ins talled do no thave suitable tir epressure
sensor sorthe sy stem is malfunctioning, e.g. because atirep res‐
sur esensor is faulty. #
Equip wheel swiths uitable tir epressur esensors.
The tir epressur emonitoring sy stem switches on af teraf ew
minutes of driving.
or #
Consult aqualified specialis tworks hop.
Tire Pressure Monitor
Inoperative *T
he tir epressur emonitoring sy stem is malfunctioning. #
Consult aqualified specialis tworks hop. Key
Displa
ymessages
Possible causes/consequences and 0050 0050Solutions
00AF
Obtain aNew Key *T
hekeyn eeds tobe replaced. #
Visit aq ualified specialis tworks hop. Ve
hicle Displa
ymessages
Possible causes/consequences and 0050 0050Solutions
x
Trackin gActive orTrack-
ing not Active *T
heVehicle Trac kerh as been activated or deactivated depending on
th ed ispla ymessage.
If th ed ispla yshows them essage Tracking Active:
The vehicle has activated services from Mercedes PR Oatits dis‐
posal.
Locating thev ehicle ma ybepossible within thef rame workof
Mercedes PR Oconnect. #
Chec kthe status of thea ctivated services at https://
mercedes.pro. #
Ask thev ehicle owner fort he de tails.
Ò *T
hetailgat eiso pen. #
Close thet ailgate.
Ñ *T
herear-en ddoor is open. #
Close ther ear-end door(s).
Ó *A
warning tone also sounds. The hoo disopen. Displa
ymessa gesa nd warning and indicator lamps 257

Lights
Displa
ymessages
Possible causes/consequences and 0050 0050Solutions
0049
Check Left Low
Beam (exa mp le) *T
he cor responding light source is defective.
Ha ve defectiv eLED lights replaced at aqualified specialis twork‐
shop. #
Obser vethen otes on changing abulb (/ page80). #
Replace thef aulty bulb at thef ront (/ page81)or rear
(/ page83).
0049
Aut oLamp sIno perative *T
he light sensor is faulty .The automatic drivin glight saremalfunc‐
tioning. #
Swit chthel ight functions on/o ffmanually (/ page77). #
Consul taqualified specialis tworks hop.
0049
Auto Lamp Function
Inoperative *T
he light sensor is faulty .The automatic drivin glight saremalfunc‐
tioning. #
Swit chthel ight functions on/o ffmanually (/ page77). #
Consul taqualified specialis tworks hop.
0049
Malfunction See Opera-
tor’s Manual *T
heexterior lighting is malfunctioning. #
Consult aqualified specialis tworks hop.
*V ehicles wit htrailer hitch: afuse ma ybefaulty.
* NO
TEElectrica lfuses #
Obser vethei nformation in thes upplement. Youm ayoth‐
erwise failto recognize dangers. #
Che ckthef uses and replace an yblown fuses (see "Fuse assign‐
ment "supplement).
If th ed ispla ycontinues tosho wthe message: #
Consult aqualified specialis tworks hop. Indicator and
warning lamps Indicator and
warning lamps on thei nstru‐
ment clus ter Some sy
stems will per form aself-tes twhen the
ignition is switched on. Som eindicator and warn‐
ing lamps ma ybriefly light up or flash. This
behavior is non-c ritical. These indica tora nd warn‐
ing lamps indicat eamalfunction onl yiftheylight
up or flash af tert he engine has been star tedor
during ajourne y. 260
Displa ymessages and warning and indicator lamps