2020 MERCEDES-BENZ SLC ROADSTER check engine light

Problem
Possible
causes/co nsequences and0050 0050
Solutions The
engine cannot be
started usingtheSmart-
Key. The
on-board voltageistoo low.
X Switch offnon- essential consumers, e.g.seat heating orinterior
lighting, andtrytostart theengine again.
If this does notwork:
X Check thestarter battery andcharge itifnecessary
(Y page 260).
or
X Jump-start thevehicle (Ypage 261).
or
X Consult aquali fied specialist workshop. The
engine cannot be
started usingKEYLE SS-
GO. TheSmartK eyisin
the vehicle. The
vehicle islocked.
X Unlock thevehicle andtrytostart thevehicle again. The
SmartK eybattery isdischarged ornearly discharged.
X Check theSmartK eybattery (Ypage 69)and replace itifneces-
sary (Ypage 69).
If this does notwork:
X Start yourvehicle withtheSmartK eyinthe ignition lock. There
isinterf erence fromapowerful sourceofradio waves.
X Start yourvehicle withtheSmartK eyinthe ignition lock. You
have lostaSmart-
Key. X
Have theSmartK eydeactivated ataq ualified specialist work-
shop.
X Report theloss immediately tothe vehicle insurers.
X Ifnecessary, havethelocks changed aswell. You
have lostthe
mechanical key. X
Report theloss immediately tothe vehicle insurers.
X Ifnecessary, havethelocks changed aswell. The
side windows can-
not beopened orclosed
using theconven ience
opening/c losingfea-
ture. The
SmartK eybattery isdischarged ornearly discharged.
X Check theSmartK eybattery (Ypage 69)and replace itifneces-
sary (Ypage 69). Doo
rs Import
antsafety notes G
WARNING
If children areleft unsupervised inthe vehi-
cle, they could:
R operate thevehicle's equipment Additionally,
childrencouldsetthe vehicle in
motion if,for example, they:
R release theparking brake
R shift theautomatic transmission outof
park position 005D
R start theengine
There isar isk ofan accident andinjury. Doo
rs
71Opening andclosing
Z

Problems
withthewindshield wipers Problem
Possible
causes/co nsequences and0050 0050
Solutions The
windshield wipers
are jammed. Leaves
orsnow, forexample, maybeobstruct ingthe windshield
wiper movement .The wiper motor hasbeen deactivated.
X For safety reasons, youshould remove theSmartK eyfrom the
ignition lock.
or X Switch offthe engine usingtheStart /Stopbutton andopen the
driver's door.
X Remove thecause ofthe obstruct ion.
X Switch thewindshield wipersbackon. The
windshield wipers
fail completely. The
windshield wiperdriveismalfunction ing.
X Select another wiperspeed onthe combination switch.
X Have thewindshield wiperscheckedataq uali fied specialist
workshop. The
windshield washer
fluid from thespray noz-
zles nolonger hitsthe
cent erofthe wind-
shield. The
spray nozzlesare misaligned.
X Have thespray nozzlesadjusted ataq uali fied specialist work-
shop. Windshield
wipers
105Lightsandwindshiel dwipers Z

Engine
Wa
rning/
ind icat or
lam p 00510051
Signa ltyp e
Possi blecauses/cons equences and0050 0050
Solu tions 00B9
0051
The yellow CheckEnginew arning lamp lightsupw hile thee ngine isrun ning.
Ther emaybe am alfunc tion,for exam ple:
R in thee ngine man agem ent
R in thef uel inject ion syst em
R in thee xhaust system
R in thei gn ition syst em
R in thef uel syst em
The emis sion limit values maybeexc eeded andthee ngine may beinemer -
gen cymod e.
X Visi taq ualifi edspec ialist workshop immediat ely.
In som estate s, you must immediat elyvisitaq ualifi edspec ialist workshop as
soon asthey ellow CheckEnginew arning lamp lightsup.This isdue tothel egal
requi rementsine ffect inthese state s.Ifin doubt ,che ck whet hersuchlegal reg-
ulati onsa pply inthes tate inwhic hyou are curren tlydriv ing. 00B6
0051
The yellow reservefuel warn inglamp lightsupw hile thee ngine isrun ning.
The fuel levelhas dro pped intot he res erverange.
X Refuel atthen ear est gas statio n. 00B6
0051
The yellow reservefuel warn inglamp flashes while thev ehicle isin mot ion.
In addit ion,the 00B9 CheckEnginew arning lamp maylight up.
The fuel fillercap isno tc losed correctlyorthef uel syst emisleak ing.
X Chec kthatthe fuel fillercap iscor rectlyclosed.
X Ifth ef uelfiller capisnot corr ectly closed :clo sethef uel fillercap.
X Ifth ef uelfiller capisclosed :visi taq ualifi edspec ialist workshop. 00AC
0051
The redcoolant warn inglamp lightsupw hile thee ngine isrun ningand the
coo lant temper aturegage isat thes tart of thes cale.
The temper aturesensor forthec oolant temper aturegage ismalf unctionin g.
The coolant temper atureisn olon ger bein gmonito red. Thereisar iskofeng ine
damag eifthe coo lant temper atureist oo high .
X Pull overand stop thev ehicle safe lyand switchoff thee ngine ,payin gatten-
tio nt or oad andtraff iccon dition s.Do notc ontin ue driv ingunde rany circum -
st anc es.
X Sec ure thev ehicle again stroll ing away (Ypage 134).
X Con sult aqualifi edspec ialist workshop. 214
Indica
torand warning lampsOn-boar dcomp uter and displa ys

If
the indicator/wa rninglampsdon otlight up
at low temperature s,itis very likely thatthe
discha rgedbattery hasfrozen. Inthis case,
you may neither chargethebattery norjump-
start thevehicle .The service lifeofat hawed -
out battery maybeshorter. Thestarting char-
acteristics canbeimpa ired, particul arlyatlow
temperature s.Have thethawed -outbattery
checked ataq ualifie dspecia listworkshop.
Rea dthe battery charger's operatinginstruc-
tions before charging thebattery.
X Open thehood.
X Connect thebattery charger tothe positive
terminal andground pointinthe same order
as when connecting thedonor battery inthe
jump-starting procedure(Y page 261). Replaci
ngthe 12Vb attery
Observe thenotes onthe 12Vb attery
(Y page 258).
Mercedes-Benz recommendsthatyouhave
the 12Vb attery replacedataq ualifie dspe-
ciali stworkshop, e.g.atan authori zed
Mercedes-Benz Center. If
you want torepla cethe battery yourself,
observe thefollow ingnotes:
R Alway srepla cead efective batterywitha
battery whichmeets thespecific require-
ments ofthe vehicle .
The vehicle isequi pped withanAGM
(Absorbent GlassMat) technology battery.
Full vehicle functionality isonly guaranteed
with anAGM battery. Forsafety reasons,
Mercedes-Benz recommendsthatyouonly
use batteries whichhavebeen tested and
appro vedforyou rvehicle byMercedes-
Benz.
R Use detachab leparts suchasbreather
hoses, angled connecting piecesorterminal
covers fromthebattery whichisto be
repla ced.
R Make surethatthevent hose isalw ays con-
nected tothe origina lopening onthe bat-
tery side.
R Install existing orsupp liedcellcaps topre-
vent gases orbattery acidfrom escapi ng.
R Make surethatthedetachab leparts are
connected againinthe same way. Jump-star
ting
For thejump-starting procedure,use only thejump-starting connectionpointinthe engine com-
partment, consisting ofap ositive terminal andaground point. G
WARNING
Battery acidiscaustic. Thereisar isk ofinjury.
Avoid contact withskin, eyesorclothing. Donot inhal eanybattery gases.Don otlea no ver the
battery. Keepchildre nawayfrom batteries. Washawaybattery acidimmedi atelywithplenty of
clean water andseek medica lattention. G
WARNING
During charging andjump-starting, explosivegases canescape fromthebattery. Thereisa
risk ofan explosi on.
Particul arlyavoid fire,open flames ,creating sparksandsmoking. Ensurethereissufficie nt
ventilation whilecharging andjump-starting. Donot leano ver abattery. G
WARNING
During thecharging process,abattery produceshydro gengas. Ifas hort circuit occurs or
sparks arecreated, thehydro gengascan ignite. Thereisar isk ofan explosi on. Jump-st
arting
261Breakd owna ssis tance
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