ECU MERCEDES-BENZ C-CLASS CABRIOLET 2021 Service Manual

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

Ac
tiv atin gcr uis eco ntr ol #
Press rock er switc h1 upM ordown
N.
The current spe edisstor ed and maint ained
by theve hicle.
or #
Select Jwithth elef tro ck er switc h.
The lastst or ed speed iscalled upand main‐
ta ined bytheve hicle.
If th elas tst or ed speed hasprev iousl ybeen
dele ted, thecur rent vehicle speed isstor ed.
% When youswit choffth eve hicle, thelas t
speed stor ed isdele ted.
Incr easing ordecr easing thesto redspe ed #
1mp h(1 km/h) :pr ess rock er switc h1 up
M ordown N tothepr essur epoint .
or #
5mp h(1 0 km/h) :pr ess rock er switc h1 up
M ordown N beyond thepr essur e
point .
or #
Accel erateth eve hicle tothedesir edspeed
and press rock er switc h1 upM.
Ad opting ade tected spee d #
Activatecr uise contr ol. #
Ifatraf fic sig nha sbee nde tected and isdis‐
pl ay ed intheins trument cluster: select J
wit hth elef tro ck er switc h.
The maximum permissible speedshownby
th etraf fic sig nis stor ed and theve hicle
maint ainsordoes notexc eed this speed.
Deactiv ating cruise contr ol #
Selec tO withth elef tro ck er switc h.
Switc hingoffcr uise contr ol #
Select Nwithth eright rock er switc h.
% Ifyo ubr ak e, deac tivateES P®
or ifES P®
int erve nes, cruise contr olisde acti vated. Ac
tiv eDi stance AssistDI ST RO NIC Fu
nction ofActiv eDi stance Assist
DI ST RO NIC
Ac tiveDis tance AssistDIS TRONI Cma intains the
se tspeed onfree-f lowing roads. Ifve hicles in
fr ont arede tected, these tdis tance isma in‐
ta ined, ifnec essar y,unt ilth eve hicle comes toa
halt. Thevehicle acceler ates orbrak es depend‐
ing onthedis tance totheve hicle infront and
th ese tspeed. Thespeed anddistance tothe
ve hicle infront arese tand save dusing the
st eer ing wheel.
Av ailable speedra ng e:
R Vehicl eswithout Drivin gAss istanc ePa ck‐
ag e:15 mp h(20 km/h) -12 0mp h
(200 km/h)
R Vehicl eswith Drivin gAss istanc ePa ck‐
ag e:15 mp h(2 0km/h) -13 0mp h
(2 10 km/h) Dr
iving and parking 15
9

#
Toactiv atewi thout ast or ed speed :pr ess
ro ck er switc h1 upM ordown N, or
select Jwithth elef tro ck er switc h.
or #
Toactiv atewi th ast or ed speed :selec t
J withth elef tro ck er switc h. #
Remo veyour foot from theacceler ator pedal.
The current spe edisstor ed and maint ained
by theve hicle.
Ad opting ade tected spee dlim it #
ActivateAc tiveDis tance AssistDIS TRONI C. #
Ifatraf fic sig nha sbee nde tected and isdis‐
pl ay ed intheins trument cluster: select J
wit hth elef tro ck er switc h.
The maximum permissible speedonthetraf‐
fi c sig nis ad op tedas thestor ed speed. The
ve hicle adaptsits speed tothat oftheve hicle
in front, butonlyup tothestor ed speed.
Pulling away wit hAc tiv eDi stance Assist
DI ST RO NIC #
ActivateAc tiveDis tance AssistDIS TRONI C
and remo veyour foot from thebr ak epedal. #
Select Jwithth elef tro ck er switc h.
or #
Depr esstheacceler ator pedal brief lyand
fi rm ly.
The funct ionsofActiveDis tance Assist
DIS TRONI Cconti nuetobe car ried out.
Deactiv atingActiv eDi stance Assist
DI ST RO NIC &
WARNIN GRisk ofan acci dent dueto
Ac tiveDis tan ceAssi stDIS TRONI Cbe ing
acti vewhen youlea vethedr iver's seat
If yo ulea vethedr iver's seat while theve hicle
is being brak ed byActiveDis tan ceAssi st
DIS TRONI Conly ,th eve hicle canrollaw ay. #
Alw aysdeactiv ateAc tiveDis tance
Assi stDIS TRONI Cand secureth eve hi‐
cle topreve ntitfrom rolling away
bef oreyo ulea vethedr iver's seat. #
Select Owithth elef tro ck er switc h.
% Ifyo ubr ak e, deac tivateES P®
or ifES P®
int erve nes, ActiveDis tance Assist
DIS TRONI Cis de acti vated. Incr
easing ordecr easing thespeed #
1mp h(1 km/h) :pr ess rock er switc h1 up
M ordown N tothepr essur epoint .
or #
5mp h(1 0 km/h) :pr ess rock er switc h1 up
M ordown N beyond thepr essur e
point .
or #
Accel erateth eve hicle tothedesir edspeed
and press rock er switc h1 upM.
Changing thespecif ieddistance totheve hi‐
cle infront #
Toreduce thespecified distance: press
th eright rock er switc hup (Ñ). #
Toincr ease thespecif ieddistance: press
th eright rock er switc hdo wn (Ò).
Fu nction ofActiv eSpe edLimit Assist
If speed limitch ang ebe tween 12mp h
(20 km/ h)and 80mph(1 30 km/h) isde tected
and theaut omatic adoptionofspeed limitsis
activ e,itwill beaut omatic allyadop tedas the
st or ed speed (/page17 6). Dr
iving and parking 16
3

R
ActiveDis tance AssistDIS TRONI Cis acti va‐
te d. #
Ifindicat orlam p1 isoff:pr ess butt on2. Fu
nction ofActiv eEme rgency Stop Assis t If
th esy stem detects that thedr iver has not
st eer edtheve hicle fora consider ableper iod of
time orhas remo vedth eir hands from thesteer‐
ing wheel, display1 appear sin themultifunc ‐
tion displa y.Ifth edr iver still does notst eer the
ve hicle, orgiv es no conf irmation tothesy stem,
a wa rning tone sou nds inad ditio nto thevisual
wa rning mess age.
If th edr iver still does notre spond tothewa rn‐
ing, theBeginn ingEmer gencySt op messag e
appear sin themultifunc tiondispla y.Ifth edr iver
st ill does notre spond, ActiveDis tance Assist DIS
TRONI Creduces thespeed. Thevehicle is
deceler ated instag es toast ands till.
De pen dingon thecount ry,at speeds below
40 mph(60 km/h) thehazar dwa rning light s
switc hon aut omat ically.
When theve hicle isstatio nary,thefo llo wing
act ions arecar ried out :
R The vehicle issecur edwithth eelectr icpar k‐
ing brak e.
R ActiveDis tance AssistDIS TRONI Cis end ed
R The vehicle isunloc ked.
R Ifpossible, anemer gency callis place dto
th eMer cedes- Benzemergency callcent er
The driver can cance lth edeceler ationatany
time byper form ing one ofthefo llo wing actions :
R Steer ing
R Braking oracceler ating
R Deact ivating ActiveDis tance Assist
DIS TRONI C 16
8
Driving and parking

lane,
espec iallyif Ac tiveLa ne Keeping
Assis taler tsyou. Be
sureto obser vethesy stem limit ations of
Ac tiveLa ne Keeping Assist. #
Press butt on2.
If indicat orlam p1 lights up,ActiveLa ne
Ke eping Assistis activ ated, thelane mark‐
ings aresho wnaslight intheassis tance gr
ap hic. Whe nAc tiveLa ne Keeping Assistis
activ e,thelane marking sar esho wningreen
in theassis tance grap hic.
Se ttin gAc tiv eLan eKe eping Assist
Multi media system:
4 Vehicle 5
k Assist ance
5 Act .Lane Keep. Assist
Ac tiv atin g/deac tivatin gthe warning #
Activate0073 ordeacti vate 0053 Lane Depart.
Warning.
Yo udo notre cei veanywa rning when leaving
a lane ifth elane keeping warning system is
deactiv ated. DY
NA MIC BODY CONT ROLfun ction DY
NA MIC BODY CONTR OLcontinuously adjusts
th ech aract eristic sof thesuspension dampersto
th ecur rent operati ng and drivi ng cond itions.
The damp ing istun edindiv iduall yfo reac hwhee l
and isaffect ed bythefo llo wing fact or s:
R The road sur face condi tions
R Vehicle load R
The drive pr ogr am select ed
R The driving style
The drive pr ogr am can beadjus tedusing the
DY NA MIC SELE CTswitc h. AIRMA
TIC Fu
nction ofAIRMA TIC
AIRMA TICisan air suspension system withva ria‐
ble dam pingfo rim prove ddr iving comfort.The
all-r ound leve lcon trol system ensur esthebes t
possible suspension andconstant grou nd clea r‐
anc e,even withaladen vehicle. When driving at
speed, theve hicle islowe redaut omatic allyto
im prove driving safetyand toreduce fuelcon‐
sum ption. Youalso have theop tion ofmanually
adjus tingtheve hicle leve l.
AI RMA TICincludes thefo llo wing compone nts
and func tions:
R Airsuspen sionwithaut omat icleve lcon trol
R Speed -dependentlo we ring toreduce fuel
con sum ption
R Manuall yselec table high leve lse tting for
gr ea tergr ound clearance 18
2
Driving and parking

Yo
uor anyone else inthevicinit yof the
wheel arch es ortheunderbody couldthus
bec ome trapped.
The vehicle canalso belowe redaf te rbeing
loc ked. #
When leaving theve hicle, makesur e
th at nobody isin thevicinit yof the
wheel arch es ortheunderbody . *
NO
TEDama gedue tovehicle lowe ring Pa
rts of thebody could bedamag edwhen
th eve hicle islowe red. #
Mak esur eth at ther ear eno obs tacles
suc has curbs underneathor inthe
immed iatevicin ityofthebody when the
ve hicle isbeing lowe red. Re
quirement s:
R The vehicle hasbeen star ted.
R The vehicle mustno tbe mo ving faster than
37 mph(60 km/h). Ra
ising theve hicl e #
Press butt on1.
Indica torlam p2 lights up.
The vehicle issetto thehigh leve l.
Yo ur sele ction issave d. The
vehicle islowe redag ain inthefo llo wing sit‐
uation s:
R When drivin gfa ster than 50 mph(80 km/h).
R When driving between 37mph(60 km/h)
and 50mph(80 km/h) forapp roxima tely
th re eminut es.
R Aftersele cting adr ive pr ogr am using the
DY NA MIC SELE CTswitc h.
The vehicle isadjus tedto theheight ofthe
act ive dr ive pr ogram.
Lo we ring theve hicl e #
Press butt on1.
Indica torlam p2 goes out.Thevehicle is
adjus tedto theheight oftheactiv edr ive pr o‐
gr am. Re
ar vie wcamer a Fu
nction ofthere ar vie wcamer a
When youen gage reve rsege ar,th eimag efrom
th ere ar vie wcam erais sho wninthemedia dis‐
pla y.Dyna micguide lines showthepat hth e
ve hicle willtake wit hth ecur rent steer ing ang le. 18
4
Driving and parking

This
helps youto orient yourself and toavoid
obs tacle swhe nba cking up.
The rear vie wcam erais on lyan aid. Itis no ta
subs titutefo ryo ur att entio nto thesur round ings.
The responsibili tyforsaf emaneu vering and
pa rking remains withyo u. Mak esur eth at ther e
ar eno per sons, animals orobjec tsetc., inthe
maneu vering area while ma neu vering and park‐
ing.
The guide linesinthemedia displaysho wthe
dis tances toyour vehicle. Thedistances dis‐
pl ay ed onlyapply toroad leve l.
Yo ucan selectfrom thefo llo wing views:
R Normalvie w
R Wide-ang levie w
The area behind theve hicle isdispla yedas a
mir rorimag e,as intheinside rear vie wmir ror.
Ve hicl eswithout Parking Assis tPA RK TRONI C
The follo wing camer avie ws areav ailable inthe
multime diasystem: Nor
mal view
1 Yello wguide line,vehicle width(dr iven sur‐
fa ce) dep endi ngon thecur rent steer ing
ang le(dynamic)
2 Yello wlanes markingth ecour sethetir es
will take wit hth ecur rent steer ing ang le
(dynamic)
3 Yello wguide lineatadis tance ofapprox ‐
imat ely3. 3ft (1.0 m) from there ar area
4 Bum per
5 Redguide lineatadis tance ofapprox imat ely
1. 0 in (0.3 m)from there ar area Wi
de-ang levie w
Ve hicl eswith Parking Assis tPA RK TRONI C
The follo wing camera views areav ailable inthe
multime diasystem: Dr
iving andparking 18
5

Nor
mal view
1 Yello wlanes markingth ecour sethetir es
will take wit hth ecur rent steer ing ang le
(dynamic)
2 Yello wguide line,vehicle width(dr iven sur‐
fa ce) dep endi ngon thecur rent steer ing
ang le(dynamic)
3 Redguide lineatadis tance ofapprox imat ely
1. 0 in (0.3 m)from there ar area
4 Yello wwa rning indic ator ofParking Assist
PA RK TRONI C:obs tacles atadis tance
be twee nap prox imat ely2. 0ft (0.6 m)and
3.3 ft(1.0 m) 5
Redwa rning displa yof Parking Assist
PA RK TRONI C:obs tacles areve ry clos e
(a ppr oximat ely1. 0 ft (0.3 m)orless)
6 Orang ewa rning displa yof Parking Assist
PA RK TRONI C:obs tacles areamed iumdis‐
ta nce away (be tween appr oximat ely1. 0 ft
(0.3 m)and 2.0ft(0.6 m)) Wi
de-ang levie w
Sy stem failur e
If th ere ar vie wcam erais no tre ady foroper a‐
tion, theq displa yappear sin themedia dis‐
pla y. Sy
stem limit s
The rear vie wcam erawill notfun ction orwill
on lypa rtiall yfunc tion inthefo llo wing situat ions:
R The trunk lidisopen .
R Ther eis hea vyrain, sno wor fog.
R The ambient lightcondit ionsarepoor ,e.g. at
night.
R Camer as,orvehicle component sin whic h
th ecamer asareins talled, aredamag ed,dirty
or covered. Obser vetheinf ormation onvehi‐
cle sensor sand camer as(/ page15 0).
% Donotus eth ere ar vie wcam erain these
types ofsituation s.Yo uco uld other wise
injur eot her sor collide withobjects when
par king theve hicle.
Fo rte ch nica lre ason s,thest andar dheigh tof the
ve hicle maybe altered ifth eve hicle iscar rying a
hea vyload andcanresult ininaccur aciesinthe
guide linesandinthedispla yof thege ner ated
ima ges.
% The displa ycont rast ma ybe impai reddue to
inc ident sunligh tor other light sources. In
th is case, paypar ticular attent ion. 18
6
Driving and parking

%
Have thedispla yre pair edorreplaced if,for
ex am ple, pixelerro rs consi derablyrestrict its
us e. 360
°came ra Fu
nction ofthesur round viewcamer a
The surround viewcam erais asy stem that con ‐
sis tsof four cam eras. The cam eras coverth e
immed iateve hicle surround ings.The system
assis tsyouwhen youar epar kingor atexits with
re duced visibility ,fo rex am ple.
The views ofthesur round viewcam eraar e
alw aysav ailable whendrivin gfo rw ards up toa
speed ofappr ox.10 mph(1 6 km/h) andwhen
bac king up.
The surround viewcam erais on lyan aid. Itis no t
a subs titutefo ryo ur att entio nto thesur round‐
ing s.The responsibili tyforsaf emaneu vering and
pa rking remains withyo u. Mak esur eth at ther e
ar eno per sons, animals orobjec tsetc., inthe
maneu vering area while ma neu vering and park‐
ing. The
system evaluat esimag esfrom thefo llo wing
cameras:
R Rear vie wcam era
R Front camer a
R Twoside camer asintheoutside mirrors
Vi ew sof thesur round viewcamer a
Yo ucan selectfrom differe nt vie ws: 1
Wide-ang levie w, front
2 Topvie wwit himag efrom thefront camer a
3 Topvie wwit himag esfrom theside camer as
in theoutside mirrors
4 Wide-ang levie w, rear 5
Topvie wwit himag efrom there ar vie wcam ‐
er a
6 Topvie wwit htrailer view(vehicles witha
tra iler hitch)
To pvie w 1
Lane indicati ngthero uteth eve hicle will
ta ke atthecur rent steer ing wheel angle
2 Yello wwa rning displa yof Parking Assist
PA RK TRONI C:obs tacles atadis tance of
ap prox imat ely3. 3ft (1.0 m) orless
3 Your vehicle from above
If th edis tance totheobjec tlessens, thecolor of
wa rning displa y2 chang es.From adis tance of Dr
iving and parking 18
7