2020 MERCEDES-BENZ C-CLASS CABRIOLET sensor

Fu
rther relat ed subje cts:
R Noteson tirepr essur e(/ page390)
R Tire pressur eta ble (/ page39 1)
R Tire and Loadi ngInfo rm atio nplacar d
(/ page39 7) Ti
re pres sur emoni toring system Fu
nction ofthetir epr essur emoni toring sys‐
te m &
DANG ER Risk ofacc iden tdue toinc or‐
re ct tirepr ess ure
Eac htir e, incl uding thespar e(if prov ided),
should becheckedmont hlywhen coldand
inf lated totheinf lation pressur ere comme n‐
ded bytheve hicle manuf actureron theve hi‐
cle placar dor tireinf lation pressur elabel .(If
yo ur vehicle hastires ofadif fere nt size than
th esize indicat edon theve hicle placar dor
th etir einf lation pressur elabel, yousho uld
de term ine thepr oper tireinf lation pressur e
fo rth ose tires). As
anadded safetyfe atur e,your vehicle has
been equipped withatir epr essur emonit or‐
ing system (TPMS) that illumin ates alow tire
pr essur ete lltale when oneormor eof your
tir es issign ifican tly und er-in flat ed. Accor d‐
ing ly,when thelow tirepr essur ete lltale illu‐
min ates, yousho uld stop and checkyo ur
tir es assoo nas poss ible, andinflateth em to
th epr oper pressur e.Driving onasignif i‐
cant lyund er-in flat ed tirecaus esthetir eto
ove rheat and canlead totirefa ilur e.Und er-
inf lation alsoreduces fuelefficie ncy and tire
tr ea dlife ,and mayaf fect theve hicle ’shan‐
dling andstopping ability.
Please note that theTPMS isno ta subs titute
fo rpr oper tiremaint enance, anditis the
dr iver ’s responsibili tyto maint aincorrect tire
pr ess ure, eve nif und er-inf latio nha sno t
re ac hed theleve lto trig ge rill umina tionof
th eTPMS low tirepr essur ete lltale.
Yo ur vehicle hasalso been equipped witha
TPMS malfunction indicatortoindic atewhen
th esy stem isno toper ating proper ly.The
TPM Smal functi onindicatoris combined with th
elow tirepr essur ete lltale. When thesy s‐
te m detects amal functi on,thete lltale will
fl ash forapp roxima tely one minu te and then
re main continuously illumina ted. This
seq uence willcontinue upon subseq uent
ve hicle star t-ups aslon gas themalfunct ion
ex ists.
When themalfunct ionindicat orisillumina‐
te d, thesy stem mayno tbe able todetect or
sig nal low tirepr ess ureas intende d.TPM S
mal functi onsmayoccu rfo ra va riet yof rea‐
son s,inc ludin gth eins tallation ofreplace‐
ment oralternat etir es orwheels ontheve hi‐
cle that preve nttheTPMS from func tioning
pr oper ly.
Alw aysch eckth eTPMS malfunct iontelltale
af te rre placing oneormor etir es orwheels
on your vehicle toensur eth at there place‐
ment oralternat etir es and wheels allowthe
TPMS tocontinu eto function proper ly. The
system checks thetir epr essur eand thetir e
te mp eratur eof thetir es installed ontheve hicle
by means ofatir epr essu resensor . Wheels
andtires 393

Ne
wtirepr essur esensor s,e.g. inwint ertires,
ar eaut omatically taught -indur ing thefirs tjou r‐
ne yth ey areused.
The tirepr essur eand thetir ete mp eratur e
appear inthemultifunc tiondispla y
(/ page39 4).
If th er eis asubs tantia lpr ess ureloss orifth e
tir ete mp eratur eis exc essiv e,youwill bewarned
in thefo llo wing ways:
R viadisp lay messa ges(/ page469)
R viathe0077 warning lam pin theins trument
clus ter(/ page49 7)
The tirepr essu remonit oring system isonl yan
aid. Itis thedr iver's responsibili tyto setth etir e
pr essur eto there comme ndedcoldtirepr ess ure
su itab leforth eoper ating situation .Se tth etir e
pr essur efo rcold tires using atir epr essu re
ga ug e. No tethat thecor rect tirepr ess urefo rth e
cur rent operati ng situa tionmu stfirs tbe taught -
in to thetir epr essur emonit oring system.
In mos tcases, thetir epr essur emonit oring sys‐
te m wil lau tomatical lyupd ateth ene wrefere nce
va lues afte ryo uha ve chang edthetir epr essur e.
Yo ucan ,ho we ver,also updat eth ere fere nce val‐ ues
byrestar tin gth etir epr essur emonit oring
sy stem manually (/page395).
Sy stem limit s
The system maybe impair edorma yno tfunc tion
in thefo llo wing situat ions:
R thetir epr essur ehas been setincor rectl y
R ther eis asudden pressur eloss caused, for
ex am ple, byafo re ign obje ctpene tratin gth e
tir e
R ther eis amalfunct ioncaused byano ther
ra dio signal source
Mak esur eto obser vethefo llo wing further rela‐
te dsubjec t:
R noteson tirepr essur e(/ page390)
Chec kingthetir epr essur ewit hth etir epr es‐
sur emoni toring system
Re quirement s:
R The ignit ionisswitc hedon. On-
boar dcom puter:
4 Service 5
Tires
One ofthefo llo wing displa ysappear s:
R Cur rent tirepr ess ureand tirete mp eratur eof
th eindividual wheels: R
Tire pressure willbedisplayed afterdriving a
few minutes
R Tire Pressure MonitorAct ive: thete ac h-in
pr oce ssofthesy stem isno tye tcomple te.
The tirepr essur esarealr eady being moni‐
to re d. #
Com pareth etir epr essur ewit hth ere com‐
mend edtirepr ess urefo rth ecur rent operat‐ 39
4
Whe elsand tires

Obser
vethefo llo wing when selecting,ins talling
and replacing tires:
R Onlyuse tires and wheels ofthesame type
(summer tires, wint ertires, MOEx tende d
tir es) and thesame make.
R Onlyins tallwheels ofthesame sizeonone
axle (leftand right).
It is onl yper missible toins talla dif fere nt
wh eelsi ze intheeve ntofaflat tirein order
to drive to thespecialis two rkshop.
R Onlyins talltir es ofthecor rect size ontoth e
wheels.
R Vehicl eswith atir epr ess uremonit oring
sy stem: Allinstalled wheels mustbe equip‐
ped withfunc tioningsensorsfo rth etir e
pr essur emonit oring system.
R Attemp eratur esbelo w45 °F(7°C), usewin‐
te rtir es orall-seaso ntir emar kedM+S forall
whee ls.
Wi nter tires bearing the004D snowflak esym‐
bol inaddition totheM+S marking prov ide
th ebes tpossible grip inwintr yro ad con di‐
tio ns. R
ForM+S tires, only usetires wit hth esame
tr ead.
R Obser vethemaximum permissible speedfor
th eM+S tires installed.
If th is isbelo wtheve hicle's maximum speed,
th is mus tbe indic ated byan appr opriate
label inthedr iver's field ofvision.
R Break inne wtires atmoder atespeeds for
th efirs t60 miles(1 00 km) .
R Replace thetir es afte rsix yearsat thelat est,
re ga rdless ofwe ar.
R Wh enreplac ingwith tires that donotfe a‐
tur eru n-flat charact eristics :ve hicles with
MOExt ended tires areno teq uipped witha
TIREFIT kitatthefa ct or y. Eq uip th eve hicle
wit haTIREFIT kitafte rre placing withtir es
th at do notfe atur eru n-f latch aract eristic s,
e.g .wint ertires.
Fo rmor einf ormation onwhee lsand tires, con‐
tac ta qu alif ied spec ialistwo rkshop.
Be sureto also obse rveth efo llo wing further
re lat ed subje cts:
R Noteson tirepr essur e(/ page390) R
Tire and Loadi ngInfo rm atio nplacar d
(/ page39 7)
R Tire size designation, load-bearing cap acity,
spe edrating andload index(/ pag e404 )
R Tire pressur eta ble (/ page39 1)
R Noteson theemer gency sparewheel
(/ page41 8) No
teson rotat ing whee ls &
WARNIN GRisk ofinju rythro ugh differ‐
ent whee lsizes
Int erch ang ingthefront and rear wheels ifth e
wheels ortires have differe nt dimens ions
ma yse verely im pair thedr iving charact eris‐
tic s.
The wheel brak es orwheel suspension com ‐
pon entsma yalso bedamag ed. #
Rotate front and rear wheels onlyifth e
wheels andtires areof thesame dimen‐
sions. Wheels
andtires 41
1

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions #
Consult aqu alif ied spec ialistwo rkshop.
PRE-SA FEInoperative See
Operator's Manual *
The PRE‑S AFE®
functions aremalfunctioning. #
Consult aqu alif ied spec ialistwo rkshop.
Mercedes meconn ect
Services LimitedSeeOper-
ator's Manual *S
ervice limited.
At leas tone ofthemain functionsof theMer cedes meconnect system ismalfunct ioning. #
Obser vetheno teson thediagnos ticsconnect ion(/ page26). #
Consult aqu alif ied spec ialistwo rkshop.
0053 Inoperative *A
tle as tone ofthemain functionsof theMer cedes meconnect system oroftheSOS emer gency callsy stem is
malfunct ioning. #
Consult aqu alif ied spec ialistwo rkshop.
Rada rSensors DirtySee
Operator's Manual *T
heradar sensor system ismalfunct ioning.Possible causes:
R Dirton thesensor s
R Hea vyrain or sno w
R Extende dcou ntrydr ivi ng without other traf fic, e.g. inthedeser t
Dr iving systems anddriving safetysy stems maybe malfunct ioningortemp orarily una vailable.
Onc eth ecause ofthepr oblem isno long erpresent ,th edr iving systems anddriving safetysy stems willbeavailable
ag ain. 44
8
Dis play messa gesand warning/ indic ator lam ps

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
or #
Ifth edispla ymessag edoes notdisappear ,st op theve hicle inaccor dance withth etra ffic con dition sand restar t
th eengine. #
Ifneces sary,cle an there ar bum per.If th ebum perisespeciall ydir ty,th esensor sin thebum permaybe mal‐
func tioning.
Blind SpotAssist Inopera-
tive *B
lind SpotAss istis malfun ctionin g. #
Consult aqu alif ied spec ialistwo rkshop.
Act ive Blind SpotAssist
Currently UnavailableSee
Operator's Manual *A
ctiv eBli nd Spo tAssi stistemp orarily una vailable.
The system limits have been reac hed (/page21 2). #
Drive on.
Once thecause ofthepr oblem isno long erpresent ,th esy stem will beavailable again.
or #
Ifth edispla ymessag edoes notdisappear ,st op theve hicle inaccor dance withth etra ffic con dition sand restar t
th eengine.
Act ive Blind SpotAssist
Inoper ative *A
ctiveBli nd Spo tAssi stismalfun ctionin g. #
Consult aqu alif ied spec ialistwo rkshop.
Traffic SignAssist Cur-
rently Unavaila bleSee
Operator's Manual *T
raffic Sign Assistis temp orarily una vailable. #
Drive on.
Onc eth ecause ofthepr oblem isno long erpresent ,th esy stem will beavailable again. Dis
playmes sagesand warning/ indic ator lam ps 455

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
Tire Press. MonitorCur-
rent lyUnavailable *T
her eis int erfere nce from apo we rful radio signal source.Asare sult, nosignals from thetir epr essur esensor sar e
being recei ved. The tirepr essur emonit oristemp orarily una vailable. #
Drive on.
The tirepr essur emon itor restar ts aut omat icallyas soon asthecause hasbeen rectif ied.
Tir ePre ss. Moni torInope ra-
tive *T
hetirepr essur emonit orisfaulty . &
WARNIN GThe reisarisk ofan accident ifth etir epr essur emonit oring system ismalfunct ioning
If th etir epr essur emonit oring system ismalfunct ioning,itis no table toissue awa rning ifth er eis pressur eloss
in one ormor eof thetir es.
Und erinf lated tires ma y,forex am ple, impair thedr iving, steer ing and braking charact eristic s. #
Have thetir epr essur emonit oring system checkedat aqu alif ied spec ialistwo rkshop. #
Consult aqu alif ied spec ialistwo rkshop.
Tire Pressure MonitorInop-
erative NoWheel Sensors *T
hewheels installed donotha ve suit able tirepr essur esensor s.The tirepr essur emonit orisdeactiv ated. #
Installwheels withsuit able tirepr essur esen sors.
0077 Wheel Sensor(s )Missin g *T
her eis no signal from thetir epr essur esensor ofone ormor ewheels. Nopressur eva lue isdispla yedfo rth eaf fec‐
te dtir e. #
Have thefa ulty tirepr ess uresen sor replaced ataqu alif ied spec ialistwo rkshop. Displa
ymessag esand warning/ indic ator lam ps 47
1

Light
s Displa
ymess ages
Possible causes/conseq uencesand0050 0050
Solutions
0049 Check LeftLow
Beam (Exam ple) *T
hecor responding lightsourceisfaulty . #
Drive on car efull y. #
Con sult aqu alif ied spec ialistwo rkshop immediat ely.
% LED lightbul bs: thedispla ymessag efo rth ecor responding lampappea rsonl ywhen allthelight- emitt ingdiodes
in thelam pha ve failed.
0049 Malfun ction See Opera-
tor ’sManual *T
heexterior lighting isfaulty . #
Con sult aqu alif ied spec ialistwo rkshop.
0049 Automatic HeadlampMode
Inoperative *T
helight sensor isfaulty . #
Visit aqu alif ied spec ialistwo rkshop. 482
Displa ymessag esand warning/ indic ator lam ps

Wa
rning/indicat orlam p
Possible causes/conseq uencesand0050 0050
Solutions
00B6 Fu elreser vewarning lam p The
yello wfuel reser vewarning lam plight sup while drivin g.
*Ther ehas been pressur eloss inthefuel system. Thefuel filler cap isno tclos edcor rectly orthefuel system isleak‐
ing. #
Close thefuel filler cap.
If th efuel filler cap hasalready been closedcor rectl y: #
Visit aqu alif ied spec ialistwo rkshop.
00AC Coola ntwa rning lam p The
redcoolant warning lam pis lit while theengine isrunning .
*P oss ible cau ses are:
R The temp eratur esensor ismalfunct ioning
R The coolant leve lis toolow
R The airsupply tothera diat orisobs truct ed
R The radiat orfanis faulty
If th er eis an additional warning tone, thecoolant temp eratur ehas exceeded themaximum permissible temp eratur e. &
WARNIN GDang erofburnswhen opening thehood
If yo uopen thehood when theengine hasoverheat edordur ing afire intheengine compartmen t,yo uco uld
co me intoco ntact withho tga ses orother escaping operating fluids. #
Beforeopen ingthehood, allowtheengine tocool down. Disp
lay mess ages and warning/ indic ator lam ps 495