2021 MERCEDES-BENZ C-CLASS CABRIOLET engine

th
etraction ofyour vehicle whene vera dr iven
whee lspins duetoinsuf ficie nttracti on.
If yo ufa ilto adap tyo ur drivin gst yle, 4MA TICcan
neit her reduce therisk ofan accident norover‐
ri de thelaws ofphysics. 4MA TICcannotta ke
acc oun tof road, weather and traf fic condi tions.
4MA TICisonly anaid. Youar ere sponsible espe‐
cially formaint ainingasaf edis tance from the
ve hicle infront, forve hicle speed, forbr aking in
good timeandforst ay ing inlane.
% Inwint ryroad con dition s,themaximum
ef fect of 4MA TICcan beachie vedonl yif yo u
use wint ertires (M+ Stir es), withsn ow
ch ains ifnec essar y. Re
fueli ng Re
fueli ngtheve hicl e &
WARNIN GRisk offire or explosion from
fuel
Fu els arehighly flammab le. #
Fire,open flames ,smo kingand creat ion
of spar ksmus tbe avo ided. #
Swit choffth eignition and,ifav ailable,
th est atio naryheat er,bef oreand while
re fuel ingtheve hicle. &
WARNIN GRisk ofinju ryfrom fuels
Fu els arepoisonous andhazar dous toyour
healt h. #
Donotsw allo wfuel orletit co me into
co ntact withsk in, eyes orclo thing. #
Donotinhale fuelvapor . #
Keep childr enaway from fuel. #
Keep door sand windo wsclos edduring
th ere fuel ingprocess.
If yo uor other people comeintocont actwith
fuel, obser vethefo llo wing: #
Imm ediat elyrinse fuelof fyo ur skin wit h
soap andwater. #
Iffuel comes intocont actwithyo ur
ey es, immediat elyrinse them thor‐ oughl
ywit hclean water.Seek medical
att entio nimm ediately . #
Ifyo usw allo wfuel, seek medicalatten‐
tio nimm ediat ely. Do notind uce vomit‐
ing. #
Cha ngeimmedi ately out ofclo thing that
has com eint ocon tact with fuel . &
WARNIN GRisk offire and explosion due
to electr ostatic charge
Ele ctrostatic charge can ignitefuel vapor . #
Beforeyo uopen thefuel filler cap or
ta ke hold ofthepum pnoz zle, touc hth e
me tallic vehicle body. #
Toavo idcreatin gano ther electr ostatic
ch arge ,do notget intoth eve hicle again
dur ing there fuel ingprocess. *
NO
TEDama gecau sed bythewr ong fuel Ve
hicles withaga soline engine: Dr
iving andparking 14
1

Ev
en sma llam ounts ofthewr ong fuelcould
re sult indamag eto thefuel system, the
engine andtheemission control system. #
Onlyre fuel withlow- sulfur gasoline.
This fuelmaycont ainupto10%ethanol. Your
ve hicle issuit able foruse withE1 0fuel .
Ne verre fuel withone ofthefo llo wing fuels:
R Dies el
R Gasoline withmor eth an 10%ethanol by
vo lume, e.g.E15, E8 5,E100
R Gasoline withmor eth an 3% methano lby
vo lume, e.g.M15,M30 ,M85 ,M1 00
R Gasoline withadditiv escon tainin gme tal
If yo uha ve acc iden tally re fuel edwithth e
wr ong fuel: #
Donotswit chtheignition on. #
Consult aqu alif ied spec ialistwo rkshop. *
NO
TEDo notus ediese lto refuel vehi‐
cles withaga soline engine If
yo uha ve acc iden tally re fuel edwithth e
wr ong fuel:
R Donotswit chtheignition on.Other wise
fuel canentertheengine.
Ev en small amounts ofthewr ong fuel
could result indamag eto thefuel system
and theengine. Therepair costsarehigh. #
Consult aqu alif ied spec ialistwo rkshop. #
Have thefuel tank and fuellines
dr ained complet ely . *
NO
TEDama getothefuel system caused
by ove rfilled fueltank s #
Only fill th efuel tank unti lth epum p
noz zleswitc hesoff. *
NO
TEFuelma yspr ayout when you
re mo vethefuel pum pnoz zle #
Onlyfill th efuel tank unti lth epum p
noz zleswitc hesoff. Re
quirement s:
R The vehicle isunloc ked.
% Donotge tint oth eve hicle again during the
re fuel ingprocess. Other wise,ele ctrostatic
ch arge cou ldbu ild up again.
Obs erve theno teson oper ating fluids andfuel.
On lyrefuel withfuel that has atleas tth eoct ane
number specifiedintheinf ormation labelinthe
fuel filler flap. Other wise, engineoutput can be
re duced andfuel consum ption increased. 14
2
Driving and parking

#
Eng agetrans mis sion positio n005D inast atio n‐
ar yve hicle withth ebr ak epedal applied
(/ page13 8). #
Switc hof fth eengine andtheignition by
pr essing button1. #
Release theser vice brak eslo wly. #
Getout oftheve hicle andlockit.
% When youpar kth eve hicle, youcan still
opera tetheside windo wsand thesof tto p
fo rapp roxima tely four min utes ifth edr iver's
door isclosed. Gar
agedoor opener Pr
og rammin gbutt onsfo rthe garage doo r
ope ner &
DANG ER Risk ofdeat hcause dby
ex haus tga ses
Combus tionengines emitpoisonous exhaus t
ga ses suchas carbon monoxide.Inhaling
th ese exhaus tga ses ishazar dous tohealt h
and leads topoisonin g. #
Neverlea vetheengine or,if pr esent ,
th eauxiliar yheating running inan
encl osedspa cewithout sufficie ntventi‐
la tio n. &
WARNIN GRisk ofinju rywhen opening
or clos ingadoor withth ega rage door
opener
When youoper ateor program thedoor with
th eint egr ated garage door opener ,per sons
in thera ng eof mo vement ofthedoor may
become trapped orbe stru ck bythedoor . #
Alw aysmak esur eth at nobody iswit hin
th era ng eof mo vement ofthedoor . Onl
yoper ateth efo llo wing doorsusing the
ga rage door opener :
R Door swit hasaf etyst op and reve rsing fea‐
tur e
R Doorswhic hcon form tothecur rent U.S.
sa fety standar ds Re
quirement s:
R The vehicle hasbeen parkedoutside the
ga rage oroutside thera ng eof mo vement of
th edoor .
R The engine isswitc hedoff.
R The ignition isswitc hedon.
% The garage door opener function isalw ays
av ailable whentheignition isswitc hedon. Dr
iving andparking 14
5

In
thefo llo wing situat ions,th eelectr icpar king
br ak eis also applied:
R ActiveDis tance AssistDIS TRONI Cis bring ing
th eve hicle toast ands till.
R The HOL Dfun ction iske eping theve hicle sta‐
tio nar y.
R ActivePa rking Assistis ke eping theve hicle
st atio nary.
This isthecase ifone ofthefo llo wing condition s
is also fulfilled:
R The engin eis switc hedoff.
R The seat belttongu eis no tins ertedin the
seat beltbuckleofthedr iver's seat andthe
dr iver's door isopened.
R Ther eis asy stem malfunct ion.
R The powe rsupp lyis insuf ficie nt.
R The vehicle isstatio naryfo ra lengt hyper iod.
When theelectr icpar king brak eis applied, the
re d0049 (USA)or0024 (Canada) indicatorlam p
lights upintheins trument cluster. The
electr icpar king brak eis no taut omaticall y
applied ifth eengine isswitc hedoffby theEC O
st ar t/ stop funct ion.
Electr icpar king brak efunction (releasing
aut omat ically)
The electr icpar king brak eis released whenthe
fo llo wing condition sar efulf illed:
R The driver's door isclos ed.
R The engin eis running .
R The trans mis sion isin po sitio n005B or005E and
yo udepr esstheaccelera torpeda lor you
shif tfr om transmission position005Dto005B or
005E when onleve lgr ou nd withth edr iver's
door closed.
R Ifth etransmission isin position 005E,the
tr unk lid mu stbe closed.
R The seat belttongu eis ins ertedint oth eseat
belt buckleofthedr iver's seat.
If th eseat belttongu eis no tins ertedint oth e
seat beltbuckleofthedr iver's seat, oneof
th efo llo wing condition smus tbe fulf illed:
- Youshif tfr om transm issionposi tion005D. -
Youha ve prev iousl ydr iven atspeeds
gr eat erthan 2mp h(3 km/h).
When theelectr icpar king brak eis released, the
re d0049 (USA)or0024 (Canada) indicatorlam p
in theins trument clustergoes out.
Appl ying/rele asing theelectr icpa rking
br ak ema nuall y
Appl ying 14
8
Driving and parking

#
Push handle 1.
The red0049 (USA)or0024 (Canada) indica‐
to rlam plig hts upintheins trument cluster.
% The electr icpar king brak eis onl ysecur ely
applied ifth eindicat orlam pis lit con tinu‐
ously .
Re leasing #
Swit chon theignition . #
Pull handle 1.
The red0049 (USA)or0024 (Canada) indica‐
to rlam pin theins trument clustergoes out.
Emer gency braking #
Press and hold handle 1.
As long astheve hicle isdriving, thePlease
Release ParkingBrak emessag eis displa yed
and there d0024 indicat orlam pflashes .
When theve hicle hasbeen brak ed toa
st ands till,th eelectr icpar king brak eis
applied. Thered0049 (USA)or0024 (Can‐
ada) indicat orlam plights upintheins tru‐
ment cluster. No
teson par king theve hicl efo ran extended
per iod If
yo ulea vetheve hicle parkedfo rlong erthan six
we eks,itma ysuf ferdama gethro ugh disus e.
The 12Vbatt eryma yalso beimpair edordam‐
ag ed byhea vydisc harging.
% Further information canbeobt ained ata
qu alif ied spec ialistwo rkshop. St
andb ymode (ext ens ion ofthe star terbat‐
te ry 's per iod out ofuse) St
andb ymode function
% This function isno tav ailable forall model s.
If standb ymode isact ivat ed, energyloss willbe
min imiz eddur ing ex tende dpe riods ofnon- oper‐
ation.
St andb ymode isch aract erize dby thefo llo wing:
R The star terbatt eryis preser ved.
R The maximum non-opera tionaltime appear s
in themedia display.
R The conn ection toonline services isint erru p‐
te d. R
The ATA(anti-t heftal ar m system) isuna vaila‐
ble.
R The func tion forde tecting collisions ona
pa rked vehicle isno tav ailable.
If th efo llo wing condition sar efulf illed, standb y
mode canbeact ivat ed ordeac tivated usin gth e
multime diasystem:
R The engine isswitc hedoff.
R The ignition isswitc hedon.
Ex ceeding theve hicle's displayednon -oper a‐
tion altime maycause inconvenience, i.e.it can‐
no tbe guarant eedth at thest ar terbatt erywil l
re liably star tth eengine.
The star terbatt erymus tbe charge dfirs tin the
fo llo wing situat ions:
R The vehicle's non-oper ational timemustbe
ex tende d.
R The Batte ryCh arg eInsu fficie ntfor Stand by
Mod emes sage appear sin themedia display.
% Standb ymode isaut omat icallydeac tivated
when theignition isswitc hedon. Dr
iving andparking 14
9

If
th eve hicle deviat esfrom thedir ect ion desir ed
by thedr iver ,ES P®
can stabiliz eth eve hicle by
int erve ning inthefo llo wing ways:
R One ormor ewheels arebr ak ed.
R The engine outputisadap tedaccor dingto
th esituation .
When ESP®
is deactiv ated, the00BB warning
lam plight sup con tinuousl y:
R Drivin gst abilit ywill nolongerbe improv ed.
R The drive wheels couldspin.
R ETS/4 ETStraction control isstill act ive.
% When ESP®
is deact ivat ed, youar est ill assis‐
te dby ESP ®
wh en braki ng.
Wh enthe00E5 warning lam pflashes ,on eor
se veralwheels hasreac hed itsgrip limit :
R Adaptyo ur drivin gst yle to suit thecur rent
ro ad and weather condition s.
R Donotdeac tivateES P®
.
R Onlyde pres sth eacceler ator pedal asfaras
is necessar ywhen pulling away. Dea
ctivateESP ®
in thefo llo wing situat ionsto
im prove tracti on:
R Whenusing snowch ains .
R Indeep snow .
R Onsand orgrav el.
% Spinn ingthewheels results inacutting
action, whichenhances traction.
If th e00E5 ESP®
wa rning lam plight sup con tinu‐
ousl y,ESP ®
is no tav ailable duetoamalf unction.
Obse rveth efo llo wing informatio n:
R Warning and indic ator lam ps(/ page44 7)
R Display messa ges(/ page398)
ET S/4ET S(Ele ctronic Tractio nSy stem)
ET S/ 4ETS tracti oncontr olispa rtof ESP ®
and
mak esitpossible topull away and accelerat eon
a slippe ryroad.
ET S/ 4ETS can improve theve hicle's traction by
int erve ning inthefo llo wing ways:
R The drive wheels arebr ak ed individually if
th ey spin. R
Mor edr ive to rq ue istrans ferred tothewheel
or wheels withtra ction.
Inf luence ofdrive pr og rams onESP®
The drive pr ogr amsena ble ESP ®
to adap tto dif‐
fe re nt we ather and road con dition sas wellas
th edr iver's prefer reddr iving style. Depen dingon
th eselect eddrive pr og ram, theappr opriate
ES P®
mode willbeactiv ated. Youcan selectthe
dr ive pr ogr ams using theDY NA MIC SELE CT
switc h(/ page13 5). Fu
nction ofESP ®
Cr osswind Assist ES
P®
Cr osswind Assistde tects sudde ngu stsof
side wind andhelps thedr iver tokeep theve hi‐
cle inthelane:
R ESP®
Cr osswind Assistis activ eat vehicle
speeds between appr ox.47 mp h(7 5 km/h)
and 125mp h(200 km/h) whendriving
st ra ight ahead orcor ner ing slight ly.
R The vehicle isstabiliz edbymeans ofindivi d‐
ua lbr ak eapp lication onone side. Dr
iving andparking 15
3

Ac
tiv atin g/deac tivatin gthe HOL Dfun ction &
WARNIN GRisk ofan acci dent dueto the
HOLD functio nbei ng activ ewhe nyo u
lea vetheve hicle
If th eve hicle isonl ybr ak ed withth eHOLD
func tion itcould, inthefo llo wing situat ions,
ro llaw ay:
R Ifth er eis amalfunct ioninthesy stem or
in thepo we rsupp ly.
R Ifth eHOLD function isdeactiv ated by
depr essing theacceler ator pedal orbrak e
pedal, e.g.byave hicle occupant. #
Alw ayssecur eth eve hicle agains tro ll‐
ing away bef oreyo ulea veit. Re
quirement s:
R The vehicle isstatio nary.
R The driver's door isclosed ortheseat belton
th edr iver's side isfastened.
R The engine isrunning orhasbe en automati‐
cally switc hedoffby theEC Ostar t/ stop
funct ion. R
The electr icpar king brak eis released.
R ActiveDis tance AssistDIS TRONI Cis de acti ‐
va ted.
R The transmis sionisin position 005B,005Eor005C.
Ac tiv atin gthe HOL Dfunc tion #
Dep ress thebr ak epedal, andafte ra shor t
time quickl ydepr essfurther until the00D9
displa yappear sin themultifunc tiondispla y. #
Release thebr ak epedal.
Deactiv atingtheHOLD function #
Depr esstheacceler ator pedal topull away.
or #
Depr essthebr ak epedal untilthe00D9 dis‐
pla ydisappear sfrom themultifunc tiondis‐
pla y.
The HOLD functionisdeactiv ated inthefo llo w‐
ing situat ions:
R ActiveDis tance AssistDIS TRONI Cis acti va‐
te d.
R The transmission isshif tedto position 005D. R
The vehicle issecur edwithth eelectr icpar k‐
ing brak e.
In thefo llo wing situat ions,th eve hicle isheld by
tr ans missi on positio n005D and /or bytheelectr ic
par king brak e:
R The seat beltisunf astened andthedr iver's
door isopened.
R The vehicle isswitc hedoff.
R Ther eis amalfunction inthesy stem orthe
po we rsupp lyis insuf ficie nt. Fu
nction ofHill StartAss ist Hill
StartAs sis tholds theve hicle fora shor t
time when pulling away on ahill under thefo l‐
lo wing condition s:
R Vehicl eswith automatic transmiss ion:
The transmis sionisin posi tion 005Bor005E.
R The electricpar king brak eis released.
This gives youen ough timeto mo veyour foot
fr om thebr ak epedal totheaccelera torpeda l
and depr essitbef oreth eve hicle begins toroll
aw ay. Dr
iving and parking 15
5

tio
nto this rest area. This function can beact iva‐
te dand deactiv ated inthemultimedia system.
If AT TENTION ASSISTis deactiv ated, theÛ
symbol appearsin theassis tance grap hicin the
Ins trument Displaywhen theengine isrunning .
AT TENTION ASSISTis activ ated aut omaticall y
when theengine isre-sta rted. The lastselect ed
sensit ivityleve lre mains stor ed.
Sy stem limit s
AT TENTION ASSISTis activ ein the37 mph
(60 km/ h)to 124mp h(2 00 km/h) speedra ng e.
Pa rticular lyin thefo llo wing situat ions,AT TEN‐
TION ASSISTonl yfunct ionsinare strict ed man‐
ner and warnings maybe dela yedor notocc ur:
R Ifyo uha ve been driving forless than appr ox‐
imat ely30 min utes.
R Ifth ero ad con dition ispoor (unevenro ad
sur face orpotholes).
R Ifth er eis ast ro ng side wind.
R Ifyo uadop ta spor tydrivin gst yle (high cor‐
ner ing speeds orhigh ratesof acceler ation).
R Ifth eSt eer ing Assis tfunc tion ofActiveDis ‐
ta nce AssistDIS TRONI Cis acti ve. R
Ifth etime hasbeen setincor rectly .
R Ifyo uch ang elane sand vary your spee dfre‐
qu ent lyIn activ edr iving situations.
The ATTENTION ASSISTdr ow siness oraler tness
assessment isrese tand restar tedwhen continu‐
ing thejour neyin thefo llo wing situat ions:
R Ifyo uswit choffth eengine.
R Ifyo uunf astenyo ur seat beltandopen the
dr iver's door (e.g.tochang edr iver sor take a
br eak).
Se tting ATTENTI ONASSIST
Multimedia system:
4 Vehicle 5
k Assist ance
5 ATTE NTION ASSIS T
Se tting options #
Select Standard, SensitiveorOff.
Sugg esting are st area #
Select SuggestRes tArea. #
Activate0073 ordeacti vate thefunc tion 0053.
If AT TENTION ASSISTde tects fatig ue or
incr easing lack ofatt ention ,it sugg ests a
re st area inthevicin ity. #
Select asugg estedre st area: youar egui‐
ded totheselect edrest area. Spe
edcont rolcr uise contr ol Fu
nction ofcruise contr ol
Cr uise controlre gulat esthespeed totheva lue
selec tedby thedr iver .
If yo uacc elerat eto ove rtak e, forex am ple, the
st or ed speed isno tdele ted. Ifyo ure mo veyour
fo ot from theacceler ator pedal afte rove rtakin g,
cr uise control will resume speed regulation back
to thestor ed speed.
Yo ucan stor ean yspeed above15 mp h
(20 km/ h)up tothemaximum designspeed.
Obser vetheno teson driving systems andyour
re sponsibili ty;yo uma yot her wise failto recog‐
nize dangers(/ page 150). Dr
iving and parking 15
7