2020 MERCEDES-BENZ SLC ECU

Alw
aysm akes uret hatn either youn orthe bat-
tery iselectro statica llyc harge d.Ab uild -u po f
el ectro static cha rge can becau sed,for exa m-
pl e:
R by wearing clothing ma de from syntheti c
fib ers
R du et ofrictio nbetwe en clothing and seats
R ifyo up usho rpullt he battery across the
car peto ro the rsyntheti cmateri als
R ifyo uw ipet he battery with ac loth G
WA
RNING
Dur ing the charging pro ces s,ab attery pro-
du ces hydro gen gas.Ifas hortcirc uito ccu rs
or spa rks arec rea ted ,the hydro gen gasc an
ig nite .The re isar isko fane xplosion.
R Ma kesure tha tthe positive term inalofa
conne ctedbattery does not come into
conta ctwith veh iclep arts.
R Nev erplace meta lobjects ortool sona
ba ttery .
R Itis imp orta nttha tyou obser vethe
de scri bedo rder ofthe battery terminals
wh en conne ctinganddisconne ctingabat-
tery .
R Whe njum p-sta rting,makes uret hatthe
ba ttery polesw ithi de nti cal polarity are
conne cted.
R Itis pa rticu larly imp orta ntto obser vethe
de scri bedo rder wh en conne ctinganddis-
conne ctingthejumperc ables.
R Nev erconne ctor disconne ctthe battery
term inalswh ilet he eng ineisrunning . G
WA
RNING
Batte ryaci disc austic.The reisar isko f
inju ry.
Avoi dconta ctwith ski n,eyes orclo thing. Do
not inhalea nybattery gases .Don otlean
ove rthe battery .Keepc hild ren away from
ba tteri es.Washaway battery acidimm edi-
ate lywith plenty ofcle an water and seek
med icalatte ntio n. H
En
viron men talnote Batte
riesc onta inpo lluta nts.
It is ille ga ltod ispo se of
them with the household
ru bb ish. The ym ustb ec ol-
le cted separate lyand dis-
po sed ofinan envi ronm en-
tal lyres ponsi bler ecy cling
sy stem . Dis
pose ofbatteri esinan
envi ronm entallyr espo nsi ble
ma nner. Take discha rged
ba tteri estoaq ualifi ed spe -
cia list wo rksh oportoac ol-
le ctio npoint for used bat-
teri es.
! Hav
ethe battery regular ly che cked ata
qu alifi ed spe cialist wo rksh op.
Co mpl ywitht he ser vice intervalsin the
Ma inte nance Booklet,or conta ctaq ualifi ed
spe cialist wo rksh opfor more informa tion.
! Alw
aysh avew orko nb atteri escar riedo ut
at aq ualifi ed spe cialist wo rksh op.
Shou ldit, inexce ptiona lcirc um stances ,be
ab sol ute lynece ssaryto disconne ctthe 12-
vol tbattery yoursel f,plea se obser vethe fol-
lo wi ng:
R Secu rethe vehiclet op revent itfrom roll-
ing away.
R Swi tch offthe igniti on.
R Dis conne ctthe negative term inalfirst and
then thepositive term inal.
The trans mission islocked inpo sitio n005D
afte rdisconne ctingthebattery .
After theworkhasb eend one,ins tallthe
ba ttery andreplace the cove rofthe positive
term inalclamp firmly .
Co mpl ywiths afety precau tions and take pro-
tecti vemea sures when handl ing batteri es. Ri
sk ofexp losion. Fir
e,op en flames andsmoking are
pro hibi ted when handl ing the bat-
tery .Avoi dc rea ting sparks. Battery
(vehi cle)
259Breakdo wnassis tan ce Z

R
Make surethatthepositive terminal ofac onn ected battery doesnotcome intocontactwith
vehicle parts.
R Never placemetal object sortools onabattery.
R Itis important thatyouobserve thedescribed orderofthe battery terminals whenconnect-
ing and disconnec tingabattery.
R When jump-st arting,makesurethatthebattery poleswithidentical polarityareconn ected.
R Itis particularly importanttoobserve thedescribed orderwhenconnecting anddisconnec t-
ing the jumper cables.
R Never connectordisconnec tthe battery terminals whiletheengine isrunning. G
WARNING
Ad ischarged batterycanfreeze attemperatures belowfreezing point.Whenjump-st artingthe
vehicle orcharging thebattery, gasescanescape fromthebattery. Thereisar isk ofan explo-
sion.
Allow thefrozen battery tothaw outbefore charging itor jump-st arting.
! Avoid
repeated andlengthy startingattempt s.Otherwise, thecatalytic convertercould be
damaged bythe non- combusted fuel.
If the indicator/warnin glamps donot light upatlow temperatures, itis very likely thatthedis-
charged batteryhasfrozen .Int his case, youmay neither chargethebattery norjump-st artthe
vehicle. Theservice lifeofat hawed-out batterymaybeshorter. Thestartin gcharacterist icscan
be impaired, particularly atlow temperatures. Havethethawed-out batterycheckedataq uali-
fied specialist workshop.
Do not start thevehicle usingarapid charging device.Ifyour vehicle's batteryisdischarged, the
engine canbejump-st artedfromanother vehicleorfrom adonor battery usingjumper cables.
Observe thefollowing points:
R The battery isnot accessible inall vehicles. Ifthe other vehicle's batteryisnot accessible,
jump-st artthe vehicle usingadonor battery orajump-st artingdevice.
R You may onlyjump-st artthe vehicle whentheengine andexhaust systemarecold.
R Do not start theengine ifthe battery isfrozen .Let the battery thawfirst.
R Only jump-st artfrom batteries witha12V voltage rating.
R Only usejumper cableswhichhaveasufficient cross-sectionandinsulated terminalclamps.
R Ifthe battery isfully discharged, leavethebattery thatisbeing usedtojump-st artconn ected
for afew minutes beforeattempt ingtostart. Thischarges thebattery slightly.
R Make surethatthetwo vehicles donot touch.
Make surethat:
R The jumper cablesarenot damaged.
R Bare parts ofthe terminal clampdonot come intocontactwith other metal partswhile the
jumper cablesareconn ected tothe battery.
R The jumper cablescannot comeintocontactwith parts which canmove whentheengine is
running, suchasthe V-belt pulleyorthe fan.
X Secure thevehicle byapply ingthe electric parking brake.
X Shift thetransmission toposition 005D.
X Make surethattheignition isswitched off.Allindicator lampsinthe instrumen tcluster must
be off. When usingtheSmartK ey,turn theSmartK eytoposition 0092inthe ignition lockand
remove it(Y page 118). 262
Jump
-startingBr eakdown assistance

Tow
inga nd tow -starti ng Impo
rtant safety notes G
WA
RNING
Wh entow ingortow -sta rtinganothe rvehicle
and itsweight isgre atertha nt he permi ssi-
bl eg ross we ight ofyour veh icle, the :
R the towingeyec ouldde tach itself
R the vehicle/tra iler comb inationc ouldrol l-
ove r.
The reisar isko fana ccident.
Wh entow ingortow -sta rtinganothe rvehi-
cle ,its we ight sho uldn otbe gre atertha n
the permi ssibleg ross we ight ofyour veh icle.
Deta ilso nthe permi ssibleg ross veh iclew eigh t
of your veh iclec an be fou ndonthe vehicle
id enti ficati on plate (Ypage 298 ).
! Wh
enActiv eBrake Assi st,Activ eDistance
Assi stDISTR ONICorthe HOLD functio nis
acti vated ,the veh icleb rakes automa tically
in certa insitua tions.
To avoidd amaget ot he veh icle, de acti vate
the sesystem sint he followi ng orsimil arsit-
ua tio ns:
R wh en tow ingthe vehicle
R in the carwash
! Onl
ysecuret he tow ropeortow bara tthe
tow ingeyes. Othe rwise, the vehiclec ouldbe
da ma ged.
! Do
not uset he tow ingeyef or reco very,
thi sc ouldda ma gethe vehicle. Ifin do ubt,
reco verthe vehiclew ithac rane.
! Wh
entow ing,pulla wa yslowly and
smo othly.Ifthe tractiv epoweristoo high,
the vehicles cou ldbe dama ged.
! Do
not tow with sling -typ eequipm ent.This
cou ldda ma gethe vehicle.
! Wh
entow ingaway veh icles with KEYL ESS-
GO ,use the key instea dofthe Star t/Stop
bu tton. Theautoma tictransmi ssion may
othe rwises hift to positio n005D when you
op en the driver 'sor fro nt-pa ssenge rdoor,
wh ich cou ldda ma gethe transmi ssion. !
Ma
kesure tha tthe electri cparkin gb rake
is rel eased .Ift he electri cparkin gb rake is
fa ulty, visitaq ualifi ed speci alistw orksh op.
! Yo
um aytow thevehiclef or am axim um
di sta nce of30 miles(50 kilome ters).At ow -
ing spee do f30m ph(50 km/h )mustn ot be
exce eded.
For towingdista nces over30m iles
(50 kilome ters),the entireveh iclem ustb e
ra ised and transp orte d.
! Wh
enyoua retow -sta rtingortow ing
ano thervehicle, its weight mu stnot exce ed
the maxim um permi ssibleg ross we ight of
yo ur veh icle.
It is be tter tohave the vehiclet ransp orte d
tha ntoh avei ttow ed away.
The automa tictransmi ssion mu stbe inpo si-
tio n005C when the vehiclei sb eing tow edaway.
The battery mustbe conne ctedandcharged.
Othe rwise, you:
R canno tturnt he Sma rtKeytop ositio n 0048 in
the igniti onlock
R canno tshift the automa tictransmi ssion to
po sitio n005C
Dea ctivate the automa ticlocking feature
be for ethe veh iclei st ow ed (Ypage 179 ).Yo u
cou ldothe rwiseb eloc ked outw henp ushing
or tow ingthe vehicle. In
stal ling /re mov ingt he tow inge ye
In stal ling the towinge ye G
WA
RNING
The exhaust tai lpipem aybe veryhot. The re
is ar isko fburns when rem oving the rear
cove r.
Do not touchthe exhaust pipe .Takep artic u-
la rc arew henr em oving the rearcove r. 26
4 Tow
inga nd tow -starti ngBreak downassistanc e

Trans
portingthe vehic le
Veh icle sw itha uto matic transmission !
Wh
enthe vehiclei sloa ded fortransp ort,
the frontand rearaxles mu stbe stationar y
and onthe same transp orta tionv ehicle.
Po sitio ning overthe conne ctionpoint ofthe
tra nsp ortveh iclei sn otpermi tted .The drive
tra inma yothe rwiseb ed amaged .
Al lv eh icle s !
Yo
um ayonl ysecuret he veh icleb ythe
wh eels,n ot by parts ofthe vehicles ucha s
axl eo rstee ringc omp onents. Othe rwise, the
veh iclec ouldbe dama ged.
The towingeyec an be used topullthe vehicle
onto atrailer or tra nsp orte rfor tra nsp orting
pu rpo ses .
X Tu rn the Sma rtKeytop ositio n 0048 inthe igni-
tio nlock.
X Shi ftthe transmi ssion topositio n005C.
As soon asthe vehic lehas been loade d:
X Pre vent thevehiclef romr olling away by
ap plying the electri cparkin gb rake.
X Shi ftthe transmi ssion topositio n005D.
X Tu rn the Sma rtKeytop ositio n 0092 inthe igni-
tio nlocka nd rem ove theSma rtKeyfromt he
ig niti onlock.
X Secu rethe vehicle. Tow
-starti ng(emerg ency engine
starti ng)
! Veh
icles with automa tictransmi ssion mu st
not betow -sta rted .You cou ldothe rwise
da ma gethe automa tictransmi ssion. Yo
uc an find informa tiono n"Jump -star ting "at
( Ypa ge261 ). Fu
ses Impo
rtant safety notes G
WA
RNING
If yo um anipulate orbridgeaf aulty fuse orif
yo ur eplace itwi th afusew ithah ighe r
am perage ,the electri ccablesc ouldbe ove r-
lo ad ed .Thisc ouldres ulti na fire. The reisa
ris ko fana ccident and injury.
Alw aysr eplace faulty fuses with the speci -
fie dn ew fuses havin gthe corr ectamperage .
Blo wn fuses mustbe rep laced with fuses of
the same rating ,which youc an reco gnizeby
the colorand value. The fuse rating sarelisted
in the fuse allo cati oncha rt.
The fuse allo cati oncha rtis locate dint he veh i-
cle tool kitinthe stow agec omp artment under
the trunk floor (Y page 253 ).
If an ewlyins erte dfusea lsob lows ,havet he
cau setraced and recti fieda taq ualifi ed spe-
cia list wo rksh op,e.g.a na uthor izedM erced es-
Benz Center.
! Onl
yusefuses thathaveb eena pproved
for Merced es-Benz vehicles and which have
the corr ectfuse rating forthe system con-
cern ed.O the rwise, comp onents orsystem s
cou ldbe dama ged.
! Ma
kesure tha tnom oistu recan ente rthe
fu se boxw hent he cove riso pen.
! Wh
enclosing the cove r,ma kesure tha tit
is lying corr ectlyonthe fuse box.Moi sture
see ping inor dirt cou ldothe rwisei mp airt he
op era tiono fthe fuses .
The fuses inyour veh icles erve toclo sedown
fa ulty cir cui ts. Ifaf useb lows ,allthe comp o-
nents onthe circui tand the irfunctio nsstop
op era ting . Bef
ore chang ingaf use
X Swi tch offthe engine.
X Swi tch offalle lectri cal cons umers. 26
6 Fu
sesBreak downassistanc e

X
Make surethattheignition isswitched off
(Y page 118).
or
X When usingtheSmartK ey,turn theSmart-
Key toposition 0092inthe ignition lockand
remove it(Y page 118).
X Secure thevehicle against rollingaway
(Y page 134).
All indicator lampsinthe instrumen tcluster
must beoff.
The fuses arelocated invarious fuseboxes:
R Fuse boxinthe engine compartmen tonthe
left-hand sideofthe vehicle, whenviewed in
the direction oftravel
R Fuse boxinthe trunk Fuse
boxinthe engine compart ment
i Observe
the"Important safetynotes" sec-
tion (Ypage 266). G
WARNING
When thehood isopen andthewindshield
wipers aresetinmotion, youcan beinjured
by the wiper linkage. Thereisar isk ofinjury.
Always switchoffthe windshield wipersand
the ignition beforeopening thehood. X
Make surethatthewindshield wipersare
turned off.
X Open thehood.
X Use adrycloth toremove anymoisture
from thefuse box.
X To open: openclamps 0044.
X Remove fuseboxcover 0043forwards. X
To close :check whether theseal islying
correct lyin cover 0043.
X Insert cover0043atthe rear ofthe fuse box
into theretainer.
X Fold down cover 0043and close clamps 0044.
X Close thehood. Fuse
boxinthe trunk
i Observe
the"Important safetynotes" sec-
tion (Ypage 266). The
fuse boxislocated inthe trunk behind the
partition covering.
X Open thetrunk lid.
X To open: release cover0043onthe right and
left-hand sideswithaflat object .
X Open cover 0043downwards inthe direction
of the arrow. Fuses
267Breakdown assistance Z

Avoi
dtire pre ssu res thatare too high inall
the tires,incl uding the sparewh eel.
Ove rinflated tiresm ay:
R incr ease the braking dista nce
R ad ver selya ffect handl ing
R we arexce ssivel ya nd/or unevenl y
R ha ve an adver seeffe cton ridec omf ort
R be more susce ptiblet od amage
Maxi mum tirepres sure s 0043
Exam ple: ma ximu mpermi ssi blet ire pre s-
su re
Nev erexce edthe maximu mpermi ssi blet ire
infl ation pre ssu re.Alw ayso bserve the reco m-
mend edtire pressu refor your veh iclew hen
ad jus ting thetire pressu re(Y page 271) .
i The
actu alvalues for tiresareveh icle-sp e-
cifi cand maydeviate from thevalues inthe
il lu stra tion. Che
ckingt he tire pres sure s
Impo rtant safetynotes The
tirepressu remoni tordoes not warnyou
of:
R inco rrectly settire pressu re
R sudd en loss oftire pressu re,e.g.from afor-
ei gn object thathas penetra tedthetire
Obs ervethe notes ontire pressu re
(Y page 271 ). Info
rma tiono nairpre ssu refor the tireson
yo ur veh iclec an be fou nd:
R on the vehicle's Tire and Loading Info rma -
tio np laca rd on the B-pi llar
R on the tire pressu retab lein the fuel filler
fla p
R in the "Tire pre ssu re" section
Che ckingt ire pres sure smanua lly To
determ ineand setthe corr ecttire pressu re,
pro cee dasfollows :
X Re move thevalve cap ofthe tire thatist o
be che cked .
X Pre ssthe tire pressu regaug es ecurelyo nto
the valve .
X Re ad the tire pressu reand comp arei ttot he
reco mme ndedvalue on the Tire and Loading
Info rma tionp laca rd orthe tire pressu re
tab le(Y page 271 ).
X Ifthe tire pressu reistoo low, incr ease the
tire pressu reto the reco mme ndedvalue.
X Ifthe tire pressu reistoo high, release air.
To do so, pressdown the meta lpininthe
va lve ,using the tipofap en for exa mpl e.
The ncheck the tire pressu reagainu sing the
tire pressu reche cker.
X Screw thevalve cap onto thevalve .
X Re peat thes estep sfor the othe rtire s. Tire
pres sure loss wa rning sys tem
(C anada only)
Ge neral notes Whi
lethe vehiclei sinm otion, the tire pres-
su re loss wa rning system monitorsthesettire
pre ssu reusing the rota tional speedofthe
wh eels.T hise nables the system todetect sig-
nifi cant pressu reloss inat ire.Ift he spe edof
rota tiono fa wheelcha nge sasa resulto fa
lo ss ofpre ssu re,acorresp ond ingwarning
mes sage willap pe ar inthe multifu nctio ndis-
pl ay .
Yo uc an reco gnizethe tire pressu reloss wa rn-
ing bythe Run FlatIndica tor Active Run
FlatIndica tor Active
Pre ss 'OK'toR estar t Pre
ss 'OK'toR estar tmes sage which
ap pe arsi nt he Ser v. Ser
v.menu ofthe multifu nc-
tio nd ispl ay .Info rma tiono nthe mes sage dis-
pl ay can befou ndinthe "Resta rting thetire 27
4 Tire
pres sureWhe elsa nd tire s

is
shown inthe Serv . Serv
.men uofthe multif unc-
tion display. Ex
ample: currenttirep ress uredisplay
For informat iononthe mess agedisplay, refer
to the "Check ingthe tirep ress ureelect roni-
cally" section(Ypage 277).
Imp ortant safet ynotes G
WARN
ING
Eac htire, inc luding thespare (ifprov ided),
should bechec kedatleast onceam onth
when coldandinflated tothe press urerec-
omme ndedbythe vehic lemanuf acturer on
the Tire andLoadin gInformat ionplacard on
the drive r'sdoor B-pillar orthe tirep ress ure
label onthe inside ofthe fuel filler flap.If
your vehic lehas tires ofad iffe ren tsize than
the size indic ated onthe Tire andLoadin g
Inf ormat ionplacard orthe tirep ress ure
label, youshould determin ethe proper tire
press ureforthosetires.
As anadded safetyfeat ure, your vehic lehas
been equipped withatirep ress uremon itor-
ing syst em(TPMS )that illuminat esalow tire
press uretelltalewhen oneormore ofyour
tir es are sign ifican tlyunder inflated. Accor d-
ingly, when thelow tirep ress uretelltaleillu-
min ates, youshould stopand chec kyour
tir es assoon aspossible ,and inflate themt o
the proper pressure.Drivin gonas ignifi-
can tlyunder inflated tirec auses thetiret o
over heat andcanlead totiref ailure. Under-
inf lation alsoreduc esfuel effic iencyand tire
tr ead life,and may affec tthe vehic le'shan-
dling andstopping ability.
Please notethat the TPMS isnot asubst i-
tut efor proper tirem aint enan ce,and itis
the drive r'srespo nsibilit ytom aintaincor-
rec ttirep ress ure, even ifunder inflation has not
reach edthe level totrigger illuminat ion
of the TPMS lowtirep ress uretelltale.
Your vehic lehas also been equipped witha
TPMS malfun ction indic atortoindic ateifthe
syst emisnot operat ingproper ly.The TPMS
malfun ction indic atoriscom bined withthe
low tirep ress uretelltale. When thesyst em
dete ctsam alfunction, thewarnin glamp will
flash forapprox imatelyam inute and then
remain continuously illuminat ed.This
sequen cewill berepeat edever ytimet he
vehic leisstar ted aslong asthe malfun ction
exis ts.
When themalfun ction indic atorisillumina-
ted, thesyst emmay notbeable todete ctor
sign allow tirep ress ureasintended .TPMS
malfun ctions may occurfor avariet yofrea-
son s,inc luding theinstallation ofinc ompat i-
ble replac ementoralter natetires orwheels
on the vehic lethat preventtheTPMS from
func tioningproper ly.Always checkthe
TPMS malfun ction tellt aleafterreplac ing
one ormore tires orwheels onyour vehic le
to ens ure that thereplac ementoralter nate
tir es and wheels allowtheTPMS tocon tinue
to func tion proper ly.
It is the drive r'srespo nsibilitytoset the tire
press uretothat recomme ndedforcold tires
which issuitable forthe operat ingsituat ion
(Y page 271).Notet hat the correcttirep res-
sure forthe curr entoperat ingsituat ionmust
firs tbetaught -intothe tirep ress uremon itor.
If as ubst antialloss ofpress ureoccurs, the
warnin gthreshold forthe warnin gmessage is
aligned tothe taught -inrefe rencevalues.
Restar tthe tirep ress uremon itorafteradjust -
ing the press ureofthe cold tires
(Y page 278). Thecurrentpress uresare
saved asnew referencevalues. Asaresult ,a
warnin gmessage willappear ifthe tirep res-
sure drops significant ly.
The tirep ress uremon itordoes notwarn youof
an incorre ctly set tirep ress ure. Obser vethe
not eson the recomme ndedtirep ress ure
(Y page 271).
The tirep ress uremon itorisnot able towarn
you ofas udden lossofpress ure,e.g.ifthe
tir ei sp enet ratedbyaf oreign object.Int he
even tofas udden lossofpress ure,bringthe 276
Tir
ep ressur eWheels andtires

If
the wheel positio nson the vehicle arerota-
ted, thetire pressu resmay bedispl ayedfor
the wrong positionsfor ashort time. Thisis
rectified afterafew minutes ofdriving, andthe
tire pressu resare displ ayedfor the correct
positio ns.
Restarting thetire pressure monitor When
yourestart thetire pressu remonitor, all
existing warning messagesare dele tedand the
warning lampsgoo ut. The monitor usesthe
currently settire pressu resasthe reference
valu esfor monitoring. Inmost cases, thetire
pressu remonitor willautoma tically detect the
new reference valuesafter youhave changed
the tire pressu re.However, youcan also set
reference valuesmanua llyas describe dhere.
The tirepressu remonitor thenmonitors the
new tirepressu revalu es.
X Set thetire pressu reto the valu erecom-
mended forthe corresponding drivingsitua-
tion onthe Tire andLoadi ngInformation
pla card onthe driver's sideB-pilla r
(Y page 271).
Additional tirepressu revalu esfor different
load scan also befound onthe tire pressu re
table onthe inside ofthe fuel fillerflap
(Y page 271).
X Make surethatthetire pressu reiscorrect
on allfour wheel s.
X Ensure thattheSmartKey isin positio n0048
in the ignition lock.
X Press the0059 or0065 button onthe steer-
ing wheel toselect theServ. Serv.
menu.
X Press the0063 or0064 button toselect
Tire Pressure Tire
Pressure.
X Press 0076.
The multifu nctiondisplayshows thecurrent
tire pressu refor the individ ualtires orthe
Tire pressure willbedisplayed Tire
pressure willbedisplayed
after driving afew minutes after
driving afew minutes message.
X Press the0064 button.
The Use Current Pressures asNew Use
Current Pressures asNew
Reference Values Reference
Valuesmessage appearsinthe
multifu nctiondisplay.
If you wishtoc onfirm therestart:
X Press 0076.
The Tire Press. Monitor Restarted Tire
Press. Monitor Restarted
message appearsinthe multifu nctiondis-
pla y. After
driving forafew minutes, thesystem
checks whether thecurrent tirepressu res
are within thespecifie drange. Thenew tire
pressu resare then accepted asreference
valu esand monitored.
If you wishtoc anc elthe restart:
X Press 0038.
The tirepressu revalu esstored atthe last
restart willcontinue tobe monitored. 278
Tire
pressureWheel sand tires