2021 MERCEDES-BENZ GLS SUV Owner's Manual

#
Stop driving afte rapp roxima tely tenminu tes
and checkth etir epr essur eusing thetir e
inf lation compressor .
The tirepr essur emus tno wbe atleas t
13 0kP a(1 .3 bar/1 9psi) . &
WARNIN GRisk ofacci dent dueto the
specif iedtirepr essur eno tbeing attained
If th especif iedtirepr essur eis no tre ac hed,
th etir eis toobadly damag ed.The tireseal‐
ant cann otrepair thetir ein this ins tance.
The braki ng and drivi ng charact eristic sma y
be great lyim pair ed. #
Donotcon tinue drivin g. #
Consult aqu alif ied spec ialistwo rkshop. In
cases suchas theone ment ioned above,con ‐
ta ct an author ized Mercedes-B enzCent er.Or
call 1-80 0-FOR-MER Cedes (intheUS A)or
1-8 00- 387-0 100(in Canada). #
Toincr ease thetir epr essur e:swit chon
th etir einf lation compressor . #
Toreduce thetirepr es sur e:press press ure
re lease button1 next to manome ter2. #
When thetir epr essur eis cor rect, unscr ew
th efilling hose from theva lve of thesealed
tir e. #
Screw theva lve cap ontoth eva lve of the
sealed tire. #
Pull thetir esealant bottle out ofthetir e
inf lation compressor .
The filling hose stay son thetir esealant bot‐
tle. #
Drive to thenear estqu alif ied spec ialistwo rk‐
shop andhave thetir e, tiresealant bottle
and filling hose replaced ther e. Bat
tery (vehicle) No
teson the12 Vbatt ery &
WARNIN GRisk ofan acci dent dueto
wo rkcar ried out incor rectly onthebat‐
te ry
Wo rkcar ried out incor rectl yon thebatt ery
can, forex am ple, lead toashor tcir cuit .This
can restrict functi onsreleva nt forsaf etysy s‐
te ms and impai rth eoper ating safetyof your
ve hicle.
Yo uco uld lose contro lof theve hicle inthe
fo llo wing situat ionsinpar ticular :
R When brakin g
R Intheeve ntofabrupt steer ing maneuv ers
and/or whentheve hicle's speedisno t
adap tedto thero ad con dition s #
Intheeve ntofasho rtcir cui tor asim i‐
la rinci dent, contactaqu alif ied spec ial‐
is two rkshop immediat ely. #
Donotdr ive on. Br
eakdo wnassis tance 34
3

#
Alw aysha ve wo rkon thebatt erycar ried
out ataqu alif ied spec ialistwo rkshop. R
Further information onABS (/page203)
R Further information onESP ®
(/ page203)
Fo rsaf etyre ason s,Mer cedes-Ben zre comme nds
th at youon lyuse batteries whic hha ve been tes‐
te dand appr ovedfo ryo ur vehicle byMer cedes-
Benz .
All vehicl esexc eptve hicl eswith alithium-
ion batt ery &
WARNIN GRisk ofexplosion duetoelec‐
tr os tatic charge
Ele ctrostatic charge can ignitethehighly
ex plosiv ega smixtur ein thebatt ery. #
Todisc hargeanyelec tros tatic charge
th at ma yha ve built up,touc hth eme tal
ve hicle body beforehandling thebat‐
te ry. The
highly flammab legasmixtur eis creat ed
while thebatt eryis ch argin gand during star tin g
assis tance. &
WARNIN GDang erofchemical burns
fr om thebatt eryacid
Batt eryacid iscaus tic. #
Avoid cont actwithth eskin ,ey es or
clo thing. #
Donotlean overth ebatt ery. #
Donotinh ale ba tter yga ses. #
Keep childr enaway from thebatt ery. #
Immedia tely rinse batter yaci dof fth or‐
oughl ywit hplenty ofclean waterand
seek medica latt ention immediately . All
vehicl es
+ ENVIR
ONMENT ALNOTEEnvironme ntal
da ma gecau sed byimproper disposal of
batt eries Bat
teries con tain polluta nts. Itis
illeg alto dispose ofthem withth ehousehold
ru bbish. #
Dispose
ofbatt eries inan
en vironmen tally re sponsible manner.
Ta ke disc hargedbatt eries toaqu alif ied
spec ialistwo rkshop ortoacol lection
poin tfo rused batteries. If
yo uha ve todiscon nectth e12 Vbatt ery, con‐
ta ct aqu alif ied spec ialistwo rkshop.
Com plywit hsaf etyno tesand take protect ive
measur eswhen handling batteries. 34
4
Brea kdo wnassista nce

Risk
ofexplosion. Fir
e,open flames andsmokingar e
pr ohibi tedwhen handling thebatt ery.
Av oid creating sparks. Ele
ctroly teor batt eryacid iscor ro‐
siv e.Avoid cont actwithth eskin ,eye s
or clo thing. Wearsuit able protect ive
clo thing, inpar ticular glove s,an
apr onand afa ce mas k.Immedia tely
ri nse electr olyteor acid splashes off
wit hclean water.Con sult adoc torif
necessar y. We
arsaf etygl asses . Ke
ep childr enaway. Obser
vethis Opera tor's Manua l.
Obser vethefo llo wing ifyo udo notint endto use
th eve hicle overan extende dpe riod oftime:
R Activatest andb ymode .
R Alternat ivel y: con nectth ebatt eryto abat ‐
te ry charge rapp rove dby Mer cedes-Ben zor
consult aqu alif ied spec ialistwo rkshop to
discon nectth ebatt ery. No
teson star ting assistance andchargin g
th e12 Vbatt ery Ve
hicl eswith alithium-ion battery
When chargin gth ebatt eryand during star tin g
assis tance, alwa ys use thejum p-startconne c‐
tio npo int intheengine compartmen t. *
NO
TEDama ging thebatt eryth ro ugh
ove rvolt age When
chargin gusin gabat tery charge rwit h‐
out amaximu mchargin gvo ltag e, thebatt ery
or theve hicle electr onics maybe damag ed. #
Onlyuse batterych arge rs wit hamax i‐
mum chargin gvo ltag eof 14.8 V. All
other vehicl es
When chargin gth ebatt eryand during star tin g
assis tance, alwa ys use thejum p-start connec‐
tion pointintheengine compartmen t.
* NO
TEDama ging thebatt eryth ro ugh
ove rvolt age When
chargin gusin gabat tery charge rwit h‐
out amaximu mchargin gvo ltag e, thebatt ery
or theve hicle electr onics maybe damag ed. #
Onlyuse batterych arge rs wit hamax i‐
mum chargin gvo ltag eof 14.8 V. Br
ea kdo wnassista nce 34
5

&
WARNIN GRisk ofexplosion from hydro‐
ge nga signiting
Ther eis adang erofhydrog en gasigniting
when chargin gth ebatt eryif th er eis ashor t
cir cuit orspar ksstar tto form . #
Mak esur eth at thepositiv ete rm inal of
th econ nect edbatt erydoes notcome
int ocon tact with vehicle parts. #
Neverpla ceme talobje ctsor tools ona
batt ery. #
The descr ibedorder ofthebatt ery
clam psmus tbe obser vedwhen con‐
nec tingand discon nectingth ebatt ery. #
When giving star tin gassis tance, alwa ys
mak esur eth at youon lyconnect bat‐
te ry term inals withident icalpolar ity. #
Dur ing star tin gassis tance, youmus t
obse rveth edescr ibedorder forcon‐
necting anddisconnecting thejum per
cable. #
Donotcon nect ordiscon nectthebat‐
te ry cla mp swhile theengine isrunning . &
WARNIN GRisk ofexplosion during
ch argin gpr oce ssand star tin gassis tance
Dur ing thech argin gpr oce ssand star tin g
assis tance, thebatt eryma yre lease anexplo‐
siv ega smixtur e. #
Avoid fire ,open flames ,cr eat ing spar ks
and smoking. #
Mak esur eth er eis suf ficie ntventil a‐
tio n. #
Donotle an ove ra batt ery. &
WARNIN GRisk ofexplosion from afro‐
zen battery
A disc hargedbatt eryma yfreeze attemp era‐
tur es slightl yabo veorbelo wfreezing point.
Dur ing star tin gassis tance orbatter ych arg‐
ing ,bat tery gascan bereleased. #
Alw aysallo wabatt eryto thaw before
ch argin git or per form ing star tin gassis ‐
ta nce. If
th eindicat or/warning lampsintheins trument
clus terdo notlig ht up atlow temp eratur es,itis
ve ry likelyth at thedisc hargedbatt eryhas fro‐
zen .In this case youma yne ither jump-start the
ve hicle norcharge thebatt ery.
The service life of abatt eryth at has been
th awe dma ybe dramaticall yshor tened .The
st ar tin gch aract eristic sma ybe impair ed,espe ‐
ciall yat low temp eratur es.
It is recomme ndedthat youha ve ath aw ed bat‐
te ry checkedat aqu alif ied spec ialistwo rkshop.
All vehicl es
* NO
TEDama gecau sed bynum erou sor
ex tende datt em ptsto star tth eengine Nu
me rous orextende datt em ptsto star tth e
engine maydamag eth ecat alytic converter
due tonon-co mbusted fuel. #
Avoid numer ousand extende datt em pts
to star tth eengine. 34
6
Brea kdo wnassista nce

Obser
vethefo llo wing pointsdur ing star tin g
assis tance and when chargin gth ebatt ery:
R Onlyuse undamag edjum per cables/c harg‐
ing cables withasuf ficie ntcross -secti onand
insu late dte rm inal clam ps.
R Non-insulat edpar tsof thete rm inal clam ps
mus tno tcom eint ocon tactwi th other metal
par tswhile thejum per cables/c harging
cable iscon nect edtothebatt ery/jum p-start
connecti onpoint.
R The jumper cable/c harging cablemus tno t
come intocont actwith anypar tswhic hma y
mo vewhen theengine isrunning .
R Alw aysmak esur eth at nei ther youno rth e
batt eryis elect rostatic allych arge d.
R Keep away from fire and open flames .
R Donotlean overth ebatt ery.
Obser vetheadditional follo wing pointswhen
ch argin gth ebatt ery:
R Onlyuse batterych arge rs tested and
appr ovedfo rMer cedes-Benz.
R Read thebatt erych arge r's oper ating instruc‐
tions beforech argin gth ebatt ery. Obser
vetheadditional follo wing pointsdur ing
st ar tin gassis tance:
R Startin gassis tance mayonly beprov ided
using vehicles, batteries orother jumpstar t
de vic es wit hano min alvoltag eof 12 V.
R The vehicles mustno tto uc h.
R Vehicl eswith aga soline engine: Jump-
st ar tth eve hicle onlywhen theengine and
ex haus tsy stem arecold. St
arting assistance andchargin gth e12 V
batt ery Re
quirement s:
R The vehicle issecur edwithth eelectr icpar k‐
ing brak e.
R Vehicl eswith automatic transmiss ion:
The transmis sionisin posi tion 005D.
R The igniti onand allele ctrical consumer sar e
swi tched off.
R The hood isopen. Ex
am ple:engine compartment #
Slid eco ver1 ofposi tiveclam p2 onthe
jum p-starting con nection point inthedir ec‐
tion ofthear row . #
Con nect posi tiveclam p2 onyour vehicle to
th epositiv epole ofthedonor batteryusing
th ejum per cable/c harging cable. Always Br
ea kdo wnassista nce 34
7

begin
withpositiv eclam p2 onyour ow n
ve hicle firs t. #
During star ting assistance :st ar tth e
engine ofthedonor vehicle andrunat idle
spe ed. #
Connect theneg ativepole ofthedonor bat‐
te ry and grou nd point 3 ofyour ow nve hicle
by usin gth ejum per cable/c harging cable.
Begin withth edonor batteryfirs t. #
During star ting assistance :st ar tth e
engine ofyour ow nve hicle. #
Dur ing thech argin gpr oc ess :st ar tth e
ch argin gpr oce ss. #
Dur ing star ting assistance :le tth eengines
ru nfo rse veralmin utes. #
Dur ing star ting assistance :bef oredis con‐
necting thejum per cable, switchon anelec‐
tr ical consumer inyour ow nve hicle, e.g.the
re ar wind owheat eror lighting.
When thest ar tin gassis tance/c harging proce ss
is com plet e, per form thefo llo wing steps: #
First,re mo vethejum per cable/c harging
cable from ground point 3and theneg ative
pole ofthedonor battery, then from positiv e
clam p2 and thepositiv epole ofthedonor
batt ery. Begi nea ch tim ewi th thecon tacts
on your ow nve hicle firs t. #
Afterre mo ving thejum per cable/c harging
cable, closecover1 ofposi tiveclam p2.
Fu rther information canbeobt ained ataqu ali‐
fi ed specialis two rkshop. Re
plac ingthe 12Vbatt ery #
Obs erve theno teson the12 Vbatt ery
(/ page343).
Mer cedes-Benz recomme ndsthat youha ve the
12 Vbatt eryre placed ataqu alif ied spec ialist
wo rkshop, e.g.atan aut hor ized Mercedes-Benz
Cent er. Obser
vethefo llo wing notesif yo uwa ntto
re place thebatt eryyo urself :
R Alw aysre place afa ulty battery wit habatt ery
whic hmee tsthespecif icvehicle requ ire‐
men ts.
The vehicle iseq uipped withan AGMtech nol ‐
ogy batter y(A bso rbentGlas sMa t)or alith ‐
ium-io nbatt ery. Fu llve hicle functionality is
onl yguar anteed withan AGMbatt eryor lith‐
ium-ion battery. Fo rsaf etyre ason s,
Mer cedes-Ben zre comme ndsthat youon ly
use batteries whic hha ve been tested and
appr ovedfo ryo ur vehicle byMer cedes-Ben z.
R Carryove rde tach able parts,suc has vent
hos es,elbo wfitting orterm inal covers from
th ebatt erybeing replaced.
R Mak esur eth at theve nt hos eis alwa ys con‐
nect edtotheor iginal opening ontheside of
th ebatt ery.
Ins tallan yex istin gor supplied cellcaps.
Ot her wise, gases orbatt eryacid could
escape.
R Mak esur eth at detach able partsarere con‐
nect edinthesame way. 34
8
Brea kdo wnassista nce

To
w star ting ortowing away Pe
rm itted towing methods *
NO
TEDama gefrom automatic braking If
one ofthefo llo wing functionsis switc hed
on, theve hicle brak es aut omatically incer‐
ta in situat ions:
R ActiveBr ak eAssi st
R ActiveDis tance AssistDIS TRONI C R
HOLD functio n
R ActivePa rking Assist
To avo iddamag eto theve hicle, deactiv ate
th ese systems inthefo llo wing orsimilar sit‐
uation s: #
Dur ing towing #
Inacar wash Mer
cedes-Benz recomme ndstransp orting your
ve hicle inthecase ofabr eakdo wn,rath er than
to wing itaw ay. Fo
rto wing, useato w rope ortow bar withbo th
axle son thegr ound. Donotuse tow bar sys‐
te ms.
* NO
TEDama getotheve hicle duetotow‐
ing away inc orrectl y #
Obs erve theins truction sand noteson
to wing away. Pe
rm itted towing methods Ve
hicl eeq uipment/ towing
me thod Bo
th axle son thegr ound Fr
ont axle raised Re
ar axle raised
4MA TICvehicles Yes,maximum 31mile s(50 km) at
31 mp h(50 km/h) No
No Br
eakdo wnassis tance 34
9

To
wing away theve hicl ewith both axle son
th egr ound #
Obser vetheno teson theper mitt edtowing
me thods (/page349). #
Mak esur eth at thebatt eryis con nect edand
ch arge d.
A disc hargedbatt eryhas thefo llo wing effects:
R The enginecanno tbe star ted
R The electr icpar king brak ecann otbe
re leased orapplied
R The automat ictransmissio ncan notbe shif‐
te dto position 005Cor005D
% Ifth eaut omatic transmiss ioncann otbe shif‐
te dto position 005C,orthemultifunc tiondis‐
pla yin theins trument clusterdoes notsho w
an ything, theve hicle mustbe transpor ted
aw ay (/ pag e35 1). Atowing vehicle with
lif ting equipment isrequ ired forve hicle
tr anspor tatio n. *
NO
TEDama gedue totowing away at
exc essiv elyhigh speeds orove rlong dis‐
ta nces The
drivet ra in could bedamag edwhen tow‐
ing atexc essiv elyhigh speeds orover long
dis tances. #
Atowing speed of30 mph(50 km/h)
mus tno tbe exc eeded. #
Atowing distan ceof30 miles(50 km)
mus tno tbe exc eeded. &
WARNIN GRisk ofacci dent whento wing
a ve hicle whichis toohea vy
If th eve hicle being tow- star tedor towe d
aw ay ishea vier than theper missible gross
mass ofyour vehicle, thefo llo wing situat ions
can occur:
R The towing eyema ybecome detach ed.
R The vehicle/tr ailercombination may
sw erve oreve nov ertur n. #
Ifano ther vehicle istow- star tedor
to we daw ay,its weight mustno texc eed th
eper missible gross mass ofyour ow n
ve hicle. #
Information ontheper missible gross mass of
th eve hicle canbefound ontheve hicle iden‐
tif ication plate(/ page392). #
Donotopen thedr iver's door orfront
passeng erdoor astheaut omatic transmis‐
sion mayot her wise shiftto position 005Dauto‐
matic ally. #
Installth eto wing eye(/ page353). #
Fasten theto w bar .
* NO
TEDama gedue toinc orrect connec‐
tion oftheto w bar #
Onlyconnect theto w rope ortow bar to
th eto wing eyes. %
Youcan also attachth eto w bar tothetrailer
hitc h. #
Deact ivat eth eaut omatic locking mechanism
(/ page72 ). #
Donotactiv ateth eHOLD function. 350
Breakdo wnassis tance