2020 MERCEDES-BENZ SL ROADSTER battery

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 287).
or
X Jump-start thevehicle (Ypage 288).
or
X Consult aquali fiedspecialist 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 77)and replace itifneces-
sary (Ypage 77).
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 ataqual ified 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 77)and replace itifneces-
sary (Ypage 77). 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 isarisk ofan accident andinjury. Doo
rs
79Opening andclosing
Z

Never
leavechildren oranimal sunattended
in the vehicle.
When leavingthe vehicle, always take the
SmartKey withyouand lock thevehicle. This
also appliesforthe Digital Vehicle Keyifthe
"Digital Vehicle Key"function isactivated via
Mercedes meconnect . Unlo
cking andopeni ngdoors from
the inside
! The
side window swil lnot open/close if
the battery isdischarge dor ifthe side win-
dows haveicedup.Itwil lthen notbepossi-
ble toclose thedoor. Donot attempt to
force thedoor closed. Youcould otherwise
dama gethe door orthe side window .
You canopen adoor from inside thevehicle
even ifit has been locked.
If the vehicle haspreviou slybeen locked from
the outside ,opening adoor from theinside
wil ltrigger theanti-theft alarm system. Switch
off the alarm (Ypage 72). X
Pull door handle 0044.
If the door islocked, lockingknob0043pops
up. The door isunlocked andcanbe
opened.
When adoor isopened, theside window on
that side opens slightly .When thedoor is
closed, theside window closesagain. Cen
trally locking andunloc kingthe
vehic lefrom theinside
You cancentrally lockorunlock thevehicle
from theinside. Forexample ,you can unlock the
front- passe ngerdoor from theinside or
lock thevehicle beforeyoupullawa y. X
To unloc k:press button 0043.
X To loc k:press button 0044.
If the front- passe ngerdoor isclosed, the
vehicle locks.
The central locking buttondoesnotlock or
unlock thefuel fillerflap orthe stowage com-
partments, suchasthe glove box.
You cannot unlockthevehicle centrally from
the inside ifthe vehicle hasbeen locked with
the SmartKey orKEYLESS- GO.
You canopen adoor from inside thevehicle
even ifit has been locked.
If alocked doorisopened fromtheinside, the
previou sunlock statusofthe vehicle willbe
taken intoconsideration if:
R the vehicle waslocked usingthelocking
button forthe central locking, or
R ifthe vehicle waslocked automa tically
The vehicle willbe fullyunlocked ifit had pre-
viousl ybeen fullyunlocked. Ifonly thedriver's
door hadbeen previou slyunlocked, onlythe
door which hasbeen opened fromtheinside is
unlocked. 80
Do
orsOpeni ngand closi ng

X
Press emergenc yrelease button0043briefly.
The trunk lidunlocks andopens.
The trunk lidcan beunlocked andopened with
the trunk lidemergenc yrelease whenthevehi-
cle isstation aryorwhile driving.
The trunk lidemergenc yrelease doesnot
unlock thetrunk lidifthe battery isdisconn ec-
ted ordischarged.
Trunk lidemergenc yrelease light:
R Emergen cyrelease button0043flashes for
30 minutes afterthetrunk lidisopened
R Emergen cyrelease button0043flashes for
60 minutes afterthetrunk lidisclosed Side
windows Impor
tantsafety notes G
WARNIN
G
While opening theside windows, bodyparts
could become trappedbetween theside
window andthedoor frame asthe side win-
dow moves. Thereisarisk ofinjury.
Make surethatnobody touches theside
window duringtheopening procedure. If
somebody becomestrapped,releasethe
switch orpull theswitch toclose theside
window again. G
WARNIN
G
While closing theside windows, bodyparts
in the closing areacould become trapped.
There isarisk ofinjury.
When closing makesurethatnoparts ofthe
body areinthe closing area.Ifsomebody
becomes trapped,releasetheswitch or press
theswitch toopen theside window
again. G
WARNIN
G
If children operatetheside windows they
could become trapped, particularly ifthey
are left unsupervised. Thereisarisk of
injury.
When leaving thevehicle, alwaystake the
Smart Keywith youand lock thevehicle.
Never leavechildren unsupervised inthe
vehicle. Side
window reversing feature
The frontside windows areequipped withan
automatic reversingfeature. Ifasolid object
blocks orrestr ictstheupward movemen tof
one ofthe fron tside windows duringtheclos-
ing process, theside window opensagain
automatically. Duringthemanual closingproc-
ess, theside window onlyopens againauto-
matically afterthecorrespon dingswitch is
released. However, theautomatic reversing
feature isonly anaid and does notrelieve you
of the responsibility ofpaying attentionwhen
closing aside window. G
WARNIN
G
The reversin gfeature doesnotrespond:
R to soft, lightandthin object s,e.g. fingers
R over thelast 1/6 in(4 mm) ofthe closing
movemen t
R while adjusting
R when closing theside window againman-
ually immediately afterautomatic revers-
ing
This means thatthereversin gfeature can-
not prevent someone beingtrapped inthese
situations. Thereisarisk ofinjury.
Make surethatnobody parts areinclose
proximit yduring theclosing procedure. If
someone becomestrapped,pressthe
switch toopen theside window again. Side
window s
87Opening andclosing Z

Problems
withtheside window s G
WARNING
If you close aside window againimmediately afterithas been blocked, theside window closes
with increased ormaximum force.Thereversing functionisthen notactive. Partsofthe body
could betrapped inthe closing areainthe process. Thisposes anincreased riskofinjury or
even fatalinjury.
Make surethatnoparts ofthe body areinthe closing area.Tostop theclosing process,
release theswitch orpush theswitch againtoreopen theside window. Problem
Possible
causes/co nsequences and0050 0050
Solutions A
side window cannot
be closed because itis
blocked byobject s,e.g.
leaves inthe window
guide. X
Remove theobject s.
X Close theside window. A
side window cannot
be closed andyoucan-
not see thecause. If
aside window isobstruct edduring closing andreopens again
slightly:
X Immediately afterthewindow blocks,pullthecorrespondin g
switch againuntiltheside window hasclosed.
The side window isclosed withincreased force.
If aside window isobstruct edagain during closing andreopens
again slightly:
X Immediately afterthewindow blocks,pullthecorrespondin g
switch againuntiltheside window hasclosed.
The side window isclosed without theautomatic reversingfunc-
tion. 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 77)and replace itifneces-
sary (Ypage 77). Roof
Import
antsafety notes G
WARNING
If you donot fully open/close thesoft top,
the soft- tophydraul icsdepressurize aftera
short time.Thiscauses thesoft toptolower
unexpect edlyandmay cause youorothers
to be trapped. Thereisarisk ofinjury.
Always openorclose thesoft topcom-
pletely. G
WARNING
Closing theroof manually isacomplicated
and techn ically demanding procedure,which
requires alot ofstren gth.Youorothers can
become trapped. Thereisarisk ofinjury.
Only have thesoft topclosed manually ata
quali fiedspecialist workshop.
! Never
siton the rear compartmen ttrim or
stow heavy objectsthere. Youwillotherwise
damage theroof andrear compartmen ttrim
of the vehicle. 90
RoofOpening
andclosing

Switching
theseat heating on/off
Switching on/off G
WARNING
Repeatedly switchingonthe seat heating
can cause theseat cushion andbackrest
pads tobecome veryhot.Thehealth ofper-
sons withlimited temperature sensitivityor
a limited abilityto react tohigh tempera-
tures maybeaffected orthey mayeven suf-
fer burn-like injuries.Thereisarisk ofinjury.
Therefore, donot switch theseat heating on
repeatedly.
! When
theseat heating isswitched on,the
seat surface canbedamaged asaresult of
object sbeing placed onthe seats, forexam-
ple, seat cushions, childseats andprotec-
tive covers notapproved byMercedes-B enz.
Ensure thatthere arenoobject son the seat
surface whentheseat heating isswitched
on. Driver's
andfront -passenger seat The
three redindicator lampsinthe button
indicate theheating levelyouhave selected.
The system automatically switchesdownfrom
level 3to level 2after approximately eight
minutes.
The system automatically switchesdownfrom
level 2to level 1after approximately ten
minutes.
The system automatically switchesoffapprox-
imately 20minutes afteritis set tolevel 1.
X Make surethattheSmartK eyisin position
0047 or0048 inthe ignition lock.
X To switch on:press button 0043repeatedly
until thedesired heating levelisset.
X To switch off:press button 0043repeatedly
until allthe indicator lampsgoout.
i If
the battery voltage istoo low, theseat
heating mayswitch off.
Problems withtheseat heating Problem
Possible
causes/co nsequences and0050 0050
Solutions The
seat heating has
switched offprema-
turely orcannot be
switched on.The vehi-
cle's electrical system
voltage istoo low
because toomany elec-
trical consumers are
switched on. Switch
offelectrical consumers thatyoudonot need, suchasthe
rear window defroster orinterior lighting.
Once thebattery issufficiently charged,switchonthe seat heating
again. Seats
101Seats,steering wheeland mirrors Z

Switching
theseat ventilation on/off
Switching on/off The
three blueindicator lampsinthe buttons
indicate theblower settingyou have selected.
X Ensure thattheSmartK eyisin position 0048
in the ignition lock.
X To switch on:press button 0043repeatedly
until thedesired blowersettingis set.
X To switch off:press button 0043repeatedly
until allthe indicator lampsgoout.
i If
the battery voltage istoo low, theseat
vent ilation mayswitch off.
i If
you open theroof using theSmartK ey
(Y page 92),thedriver's seatventilation is
automatically switchedonand theside win-
dows open.
Problems withtheseat ventilation The
seat ventilation hasswitched offprema-
turely orcannot beswitched on.The vehicle's
electrical systemvoltage istoo low because
too many electrical consumers areswitched
on.
X Switch offelectrical consumers thatyoudo
not need, suchasthe rear window defroster
or interior lighting.
X Once thebattery issufficiently charged,
switch onthe seat heating again. AIRSCA
RF
Setting headlevelheating (AIRSCARF) G
WARNING
When AIRSCARF isswitched on,very hotair
can flow from thevent sin the head
restraint s.This could result inburns inthe
immediate vicinityofthe airvent s.There isa
risk ofinjury.
Reduce theheater output beforeitbecomes
too hot. The
AIRSCARF functionwarms thehead and
neck areaofvehicle occupants withwarm air.
The warm airflows outofthe holes inthe head
restraint s.
The three redindicator lampsinthe button
indicate theheating levelyouhave selected.
X Ensure thattheSmartK eyisin position 0048
in the ignition lock.
X To switch on:press button 0043.
Three redindicator lampsinthe button light
up. The blower startsupafter apreheating
phase ofseven seconds.
X Press button 0043repeatedly untilthedesired
heating levelisset.
X To switch off:press button 0043repeatedly
until allthe indicator lampsgoout.
i The
blower continues running forseven
seconds tocool down theheating elements.
i If
the battery voltage istoo low, AIRSCARF
may switch off. 102
SeatsSeats,
steering wheeland mirrors

Int
erior ligh ting cont rol
Gener alnot es In
ord erto pre ven tth eveh icle's battery from
disc harg ing,th eint erio rligh ting fun ction sare
auto maticallydeac tivat ed aftersom etime,
unle sstheSm artKey isin pos ition 0048inthe
ign ition lock.
The color and brightne ss oftheambi entligh t-
ing are setviathemult imed iasyst em
(Y page 202).
Aut oma tic int erior ligh ting cont rol X
To swit chon: settheswit chtocenter pos i-
ti on 004B.
X To swit choff:set theswit chtothe0033
pos ition .
The interio rligh ting auto maticallyswit ches on
if you:
R unlo cktheveh icle
R open adoor
R rem ove theSm artKey from theign ition lock
The interio rligh ting isswit ched on for aset
ti me when theSm artKey isrem ovedfrom the
ign ition lock.You canactivat eth is delaye d
swit ch-off usin gth eon -board comput er
(Y page 203). Rep
lacin gbul bs
The fron tand rear lamp sof your vehicleare
equipp edwithLE Dbulbs .Do notrep lace the
bulbs yourself.Con tacta qualif iedspec ialist
wor kshop whic hhas thene cessar yspec ialist
kn owled geand tools tocar ryout thewor k
req uire d.
Bulb sand lamp sare animpo rtant aspe ctof
veh iclesaf ety. You must there foremak esur e
th at these function correc tly at all times .Hav e
th eheadl ampsetting checke dreg ularly. Win
dshiel dwiper s Swit
chingth ewind shield wiper s
on/of f
! Do
notoper atethewin dsh ield wiper s
when thewin dsh ield isdry, asthis co uld damag
eth ewiper blades.Mor eover,dust
th at has collec tedon thewin dsh ield can
sc rat ch theglass ifwipin gtak esplac ewhen
th ewin dsh ield isdry.
If it is ne cessar yto swit chon thewin dsh ield
wiper sin dry weat hercond ition s,always use
washe rfluid when operating thewin dsh ield
wiper s.
! If
th ewin dsh ield wiper sleav esme arson
th ewin dsh ield aftertheveh iclehas been
washe din an auto maticcar wash, waxor
ot her residues maybethereas onfor this.
Clean thewin dsh ield usingwashe rfluid
aft erwashi ngtheveh iclein an auto matic
car wash.
! In
te rm itte nt wipin gwit hrain sensor:due
to opt ical influen cesand thewin dsh ield
bec omi ngdirt yin dry weat hercond ition s,
th ewin dsh ield wiper smay beact ivat ed
ina dve rten tly. This could then damag eth e
win dsh ield wiper bladesor scrat ch thewin d-
shie ld.
Fo rth is reas on,you should always switch
off thewin dsh ield wiper sin dry weat her. Comb
ination swit ch
0047 003F Windshield wiper off
0048 0062 Inte rm itte nt wipe, low(rain sensor
set tolow sensitivit y)
0049 0063 Inte rm itte nt wipe, high(rain sensor
set tohigh sensitivit y)
004A 00AA Continuo uswipe, slow
004B 00A9 Continuo uswipe, fast
0084 00D3 Single wipe/ 00D4Wipes thewin d-
shie ldusin gwashe rfluid
If th ewiper bladesare worn,thewin dsh ield
will nolonger bewiped properly.This could
pre ven tyou from observing thetraff icco nd i-
ti on s. Wind
shield wiper s
113Light sand winds hieldwiper s Z

MAX
COOLmaximum cooli ng
The MAX COOL function isonly available in
vehicl esfor the USA.
MAX COOL isonly opera tional whenthe
engine isrunning.
X To activate :press the00C9 button.
The indica torlamp inthe button lights up.
X To deactiv ate:press the00C9 button.
The indica torlamp inthe button goesout.
The previ ouslysele cted settings are
restored .
When youactiva teMAX COOL, climatecontrol
swi tches tothe followi ngfunctions:
R maximu mcooli ng
R maximu mairfl ow
R air-re circul ation mode on Removi
ngcondens ationfromthe
wi ndow s
Windo wsfogg edup onthe inside X
Activate the005A coolingwith airdehu midi-
ficatio nfunction.
X Activate the0058 mode button.
X Ifthe windo wscontinue tofog up,activa te
the 0064 "Windshie lddefros ting"function.
i You
shou ldonly selectthis setting untilthe
winds hieldis clea raga in. Windo
wsfogg edup onthe outside X
Activate thewinds hieldwip ers.
X Press the008F button repeatedlyuntilthe
009C or009B symbolapp ears inthe disp lay.
i You
shou ldonly selectthis setting untilthe
winds hieldis clea raga in. Rear
window defroste r
Gene ralnote s The
rear windo wdefros terhas ahigh current
draw .You shou ldtherefore switch itoff as
soon asthe rear windo wisclea r.Otherwi se,
the rear windo wdefros terswitches offauto-
matica llyafter severa lminutes.
If the battery voltageis too low,the rear win-
dow defros termay switch off.
Ac tivating /deactivating X
Turn theSmartKey toposi tion 0048inthe igni-
tion lock (Ypag e126).
X Press the006C button.
The indica torlamp inthe 006C button lights
up orgoes out.
Probl emswith the rear window defroste r Probl
em Poss
iblecause s/cons equen cesand 0050 0050
Sol utions The
rear windo w
defros terhas deactiva-
ted prema turelyor can-
not beactiva ted. The
on-board voltageis too low becau setoo many electrical con-
sume rsare switched on.
X Switch offany consumers thatarenot requ ired,e.g. read ing
lamp s,interior lighting orthe seat heating.
When thebattery issuffi ciently charged,the rear windo w
defros tercan beactiva tedagain. Operating
theclimate control systems
121Climate control