warning MERCEDES-BENZ C-CLASS CABRIOLET 2021 Service Manual

Af
teryo uha ve driven fora fe w min utes, the
tir epr es su re loss warning system monit ors
th ese ttir epr essur eof all thetir es.
Be sureto also payatt ent ion tothefo llo wing
re lat ed topic:
R Noteson tirepr essur e(/ page355) Loading
theve hicl e No
teson Tire and Loading Information plac‐
ar d &
WARNIN GRisk ofacci dent from overloa‐
ded tires
Ov erloaded tires ma yove rheat and burstas a
con sequenc e.Ov erloaded tires can also
im pair thesteer ing and handling charact eris‐
tic sand lead tobrak efa ilur e. #
Obser vetheload rating ofthetir es. #
The load rating mustbe atleas thalf the
per missible axleload oftheve hicle. #
Neverove rload thetir es by exc eeding
th emaximum load. The
Tire and Loadi ngInfo rm atio nplacar dis on
th eB-pillar onthedr iver's side oftheve hicle. 1
Tire and Loadi ngInfo rm atio nplacar d %
The datasho wnintheillus tration isexam ple
dat a.
The Tire and Loadi ngInfo rm atio nplacar dsho ws
th efo llo wing informatio n:
R Maxim umnumb erofseats 2according to
th emaximum numberofpeople permitt edto
tr av el in theve hicle. 362
Wheels andtires

#
Neverins tallmor eth an oneemer gency
spa rewheel orspar ewheel that dif fers
in size . #
Onlyuse anemer gency sparewheel or
spar ewheel ofadif fere nt size briefly. #
Donotsw itchof fESP ®
. #
Have theemer gency sparewheel or
spar ewheel ofadif fere nt size replaced
at thenear estqu alif ied spec ialistwo rk‐
shop. Thenewwheel mustha ve the
cor rect dimensi ons. %
The eme rgency sparewheel issec ured inthe
emer gency sparewheel baginthetrunk .
Obser vethefo llo wing noteson installing an
emer gency sparewheel:
R Chec kth etir epr essur eof theemer gency
spa rewheel installed. Correct thepr essur e
as neces sary.
R The maximum permissible speedwithan
emer gency sparewheel installed is50 mph
(80 km/ h). R
Donoteq uip theemer gency sparewheel
wit hsn ow chains .
R Replace theemer gency sparewheel afte rsix
ye arsat thelat est,re ga rdless ofwe ar.
% Ve
hicl eswith atir epr ess urelos swa rn‐
ing system: Ifan emer gency sparewheel is
ins talled thetir epr essur eloss warning sys‐
te m canno tfunction reliabl y.Onl yre star tth e
sy stem again when theemer gency spare
wheel hasbeen replaced withane wwheel.
Ve hicl eswith atir epr ess uremonit oring
sy stem: Ifan emer gency sparewheel is
ins talled thetir epr essur emonit oring system
cann otfunction reliabl y.Fo ra fe w min utes
af te ran emer gency sparewheel isins talled,
th esy stem mayst ill displa yth etir epr essur e
of there mo vedwheel. Onlyre star tth esy s‐
te m again when theemer gency sparewheel
has been replaced withane wwheel.
Be sureto also obse rveth efo llo wing further
re lat ed subje cts:
R Noteson tirepr essur e(/ page355)
R Tire and Loadi ngInfo rm atio nplacar d
(/ page36 2) R
Tire pressur eta ble (/ page35 7)
R Noteson installing tires (/ page37 4) 38
4
Whee lsand tires

*
NO
TEDama gedue toinc orrect refrig er‐
ant If
anon-appr ovedre frig er ant isuse d,thecli‐
mat econ trol system maybe damag ed. #
USA:use onlyR‑1 34a refrig er ant. #
Canada: useonlyR‑1 234yf refrig er ant. *
NO
TEDama getotheclimat econ trol
sy stem due toinc orrect refrig er ant com‐
pr essor oil #
Onlyuse refrig er ant com pressor oilthat
has been approvedby Mer cedes-Ben z. #
Donotmix theappr ovedre frig er ant
com pressor oilwithadif fere nt refrig er‐
ant com pressor oil. Wo
rkon theclimat econ trol system maybe car‐
ri ed out onlyby aqu alif ied spec ialistwo rkshop.
All appli cable regulations, aswellas SAEstand‐
ar dJ63 9,mus tbe adher edto.
The information labelforth eclimat econ trol sys‐
te m rega rding there frig er ant type andthere frig‐ er
ant com pressor oil(PAG oil) islocat edon the
insid eof thehood. Inf
ormation label(exa mp le–US A/China)
1 Hazardand service warning symbols
2 Refrig er ant filling capac ity
3 Applic ablestandar ds
4 PAGoil par tnum ber
5 GWP(global warming potentia l)of there frig‐
er ant used
6 Refrig er ant type Inf
ormation label(exa mp le–Canada)
1 Hazardand service warning symbols
2 Refrig er ant filling capac ity
3 Applic ablestandar ds
4 PAGoil par tnum ber
5 GWP(global warming potentia l)of there frig‐
er ant used
6 Refrig er ant type
Symbo ls1 indica tethefo llo wing:
R Possible dangers
R The need tohave ser vice workcar ried out at
a qu alif ied spec ialistwo rkshop only Te
ch nica lda ta 395

Disp
laymes sages Int
roducti on In
fo rm ation about displaymessag es
Displ aymessa gesappea ron themultifunc tion
displa y.
Dis play messa geswit hgr aphical symbols are
sim plified intheOper ator's Manual andmaydif‐
fe rfr om thesymbols onthemultifunc tiondis‐
pla y.The multifunct iondispla ysho wshigh-pr ior‐
ity displa ymessag esinred. Cer tain displa ymes‐
sag esareacc ompanied byawa rning tone.
Pl ea se act inacco rdanc ewit hth edispla ymes‐
sag esand follo wtheadditional notesin the
Oper ator's Manual .
Fo rsome display messa ges,asymbol willalso
be sho wn:
R Õ Further information
R 00A4 Hidedispla ymessag e
Wi th thelef t-hand Touc hCon trol, youcan select
th ere spectiv esymbol byswiping tothelef tor
ri ght. Press theÕ symbol tosho wfur ther infor‐ mation
onthemedia display.Press the00A4
symbol tohide thedispla ymessag e.
Yo ucan hide low- prior ity displa ymessag esby
pr essing theP backbutt onorthelef t-hand
To uc hCon trol. The displ aymessa geswill then
be stor ed inthemessag ememor y.
Re ctify thecause ofadispla ymessag eas
qu ickl yas possible .
High- prior ity displa ymess ages can notbe hid‐
den. Themultif unction displa ysho wsthese dis‐
pla ymessag escon tinuousl yuntil thecause of
th edispla ymessag ehas been rectif ied.
Cal ling up save ddispl aymes sages
On-b oard com puter:
4 Service5
1Mes sage
If th er ear eno displa ymessag es,NoMessages
will appear onthemultifunc tiondispla y. #
Scrollth ro ugh thedispla ymessag esby swip‐
ing upw ards ordown wardson thelef t-hand
To uc hCon trol. #
Toexitth emess agemem ory: press the
bac kbutt onP. 398
Displa ymessag esand warning/ indic ator lam ps

Occupant
safety Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
0075 SRS Malfunct ionServic e
Required *T
herestra int system ismalfunct ioning(/page36). &
WARNIN GRisk ofinju rydue tomalfu nctions inthere stra int system
Com ponen tsinthere stra int system maybe activ ated unint entionally ornotdeplo yas planned inan acciden t. #
Have there stra int system checkedand repair edimmediat elyataqu alif ied spec ialistwo rkshop. 0075
Front LeftMalfunction
Service Required(exa mp le) *T
hecor responding restra int system ismalfunct ioning(/page36). &
WARNIN GRisk ofinju rydue tomalfu nctions inthere stra int system
Com ponen tsinthere stra int system maybe activ ated unint entionally ornotdeplo yas planned inan acciden t. #
Have there stra int system checkedand repair edimmediat elyataqu alif ied spec ialistwo rkshop. 0075
Left Side Curtain Airbag
Malfunction Service
Requ ired(Exam ple) *T
hecor responding headairbag ismalfunctioning (/page36). &
WARNIN GRisk ofinju ryor deat hdue tothehead airbag malfunct ioning
If th ehead airbag ismalfunct ioning,itmight betrigg ered unint entionall yor might notdeplo yat all intheeve nt
of an acci dent. #
Have thehead airbag checkedand repair edimmediat elyat aqu alif ied spec ialistwo rkshop. Displa
ymessag esand warning/ indic ator lam ps 399

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
Fron tPassenger AirbagDis-
abled SeeOperator' sMan-
ual *T
hefront passeng erairbag andthefront passeng erknee airbag have been disabled eventh ough anadult oraper‐
son ofadult statur eis on thefront passeng erseat. Ifadditional forc es areapplied totheseat, thewe ight thesy s‐
te m detects maybe toolow. &
WARNIN GRisk ofinju ryor fata linj urydue toadisable dfron tpasse nger airbag
If th efront passeng erairbag isdisabled, thefront passeng erairbag willnotbe deplo yedin theev ent ofan acci‐
dent andcann otper form itsintended protect ive func tion.
A per son inthefront passeng erseat could then, forex am ple, com eint ocon tact with theve hicle's interior ,
especially ifth eper son issitt ing tooclose tothecoc kpit. #
Mak esur e,bo th bef oreand during thejour ney,that thest atus ofthefront passeng erairbag iscor rect. #
Stop theve hicle immediat elyinaccor dance withth etraf fic condi tions. #
Makesur eth at no obj ect sar etrapped underth efront passeng erseat. #
Chec kth est atus oftheaut omatic front passeng erairbag actuation (/page47 ). #
Ifnec essar y,consu ltaqu alif ied spec ialistwo rkshop immediat ely.
Front Passeng erAirb ag
Enabl edSee Operator 's
Manu al *T
hefront passeng erairbag andthefront passeng erknee airbag willbeenabled whiletheve hicle isin mo tion inthe
fo llo wing situat ions:
R Even when ach ild, aper son ofsmaller statur eor an obj ect weighin gless than thesy stem weight thre shold is
locat edon thefront passeng erseat
R Even when thefront passeng erseat isno toccupied 400
Displa ymessag esand warning/ indic ator lam ps

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
The system mayde tect obje ctsorforc es that areaddin gto thewe ight applied totheseat. &
WARNIN GRisk ofinju ryor deat hwhen usingach ild restra int system while thefront passeng erairbag is
enabled
If yo usec ureach ild inach ild restra int system onthefront passeng erseat andthefront passeng erairbag is
enabled, thefront passeng erairbag candeplo yin theeve ntofan acci dent.
The child could bestru ck bytheairbag. #
Ensur e,bo th bef oreand during thejour ney,that thest atus ofthefront passeng erairbag iscor rect.
NEVER useare ar wa rdfacing child restra int onaseat protect edbyan ACTIVE AIRBAGinfront ofit,DE ATHor
SERIOU SINJU RYtotheCH ILD can occur . #
Stop theve hicle immediat elyinaccor dance withth etraf fic condi tions. #
Makesur eth at no obj ect sar etrapped underth efront passeng erseat. #
Chec kth est atus ofaut omat icfron tpasse nger airbag actuatio n(/ page47 ). #
Ifnec essar y,consu ltaqu alif ied spec ialistwo rkshop immediat ely.
PRE-S AFEInoperat iveSee
Operator's Manual *
The PRE‑S AFE®
funct ionsaremalfunct ioning. #
Consult aqu alif ied spec ialistwo rkshop. Displa
ymessag esand warning/ indic ator lam ps 40
1

Smar
tKey Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
Á Obtain aNew Key *H
aveSmar tKey replaced. #
Consult aqu alif ied spec ialistwo rkshop.
Á Repla ceKey Battery *T
heSmar tKey batt eryis disc harged. #
Replace thebatt ery(/ page65).
Á Key NotDetected(whit e
displa ymessag e) *T
heSmar tKey iscur rentl yund etect ed. #
Chang eth elocation oftheSmar tKey intheve hicle. #
Ifth eSmar tKey isstill no tre cogni zed,place itin themar kedspace forst ar tin gwit hth eSmar tKey
( / pag e12 6). 402
Displaymessa gesand warning/ indic ator lam ps

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
Á Key NotDetected (red dis‐
pla ymessag e) *T
heSmar tKey canno tbe detected and mayno long erbe intheve hicle.
The Smar tKey isno long erintheve hicle andyouswit choffth eengine:
R Youcan nolongerst ar tth eengine.
R Youcan notcen trally lockth eve hicle. #
Ensur eth at theSmar tKey isin theve hicle.
If th eSmar tKey detection functi onhasa mal functi ondueto ast ro ng radio signal source: #
Stop theve hicle immediat elyinaccor dance withth etraf fic condi tions. #
PlacetheSmar tKey inthemar kedspace forst ar tin gth eengine withth eSmar tKey (/ pag e12 6).
Á Don't ForgetYour Key *A
warning tone also sou nds. Thismes sage reminds youto take your Sm artK ey wit hyo uwhen youlea vetheve hicle.
Place theKey inthe
Marked SpaceSeeOpera-
tor's Manual *S
mar tKey detection ismal functi oning. #
Chang eth elocation oftheSmar tKey intheve hicle. #
Place theSmar tKey inthemar kedspace forst ar tin gth eengine withth eSmar tKey (/ pag e12 6). Dis
play messa gesand warning/ indic ator lam ps 403

Sof
tto p Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
0059 While station ary,apply the
brakes beforeoperating
the soft top. *T
hevehicle isstatio naryand youar etrying toopen orclose thesof tto p. #
Depr essthebr ak epedal. #
Push orpull thesof tto pswitc hag ain until thesof tto pis fully open orclosed.
0059 Conver tibleTopOperation
Possible to37 mph *I
fyo udr ive at spee dsgreat erthan 37 mph(6 0km/h), youcan notopen orclo sethesof tto p. #
Donotdr ive at speeds great erthan 37 mph(6 0km/h). #
Fully open orclos eth esof tto p.
0059 Conver tibleTopLowering *T
hesof tto pis no tfully opened orclosed. Thehydraulics aredepr essur ized. #
Fully open orclos eth esof tto p. 40
4
Displa ymessag esand warning/ indic ator lam ps