engine MERCEDES-BENZ GLS SUV 2020 Workshop Manual

#
Onlyins talla ball couplin gth at mee ts
th eper mitt eddimension sand hasbeen
designed forth etrailer operation
re qu iremen ts. #
Donotmodif yth eball coupling orthe
tr ai le rhi tc h. The
values approvedby themanuf acturercan be
fo und ontheidentif ication platesand inthe
"T ec hn ical data"sec tionunde r"T ra iler hitch"for
th eto wing vehicle (/page565). &
WARNIN GSw erving oftheve hicle/
tr ailer combination duetoinc reased
spee d
If th eve hicle/tr ailercombination swerve s,
yo ucan lose contro lof it.
The vehicle/tr ailercombination caneven tip
ove r. #
Under nocircums tances should yo utry
to inc rease thespeed tostra ight enthe
ve hicle/tr ailercombination. #
Reduce speed anddonotcount er-ste er. #
Ifneces sary,appl yth ebr ak es. *
NO
TEDama getotheengine asare sult
of ove rheating #
Ifyo ure trof itatrai le rhi tc h, mod ifica ‐
tio ns totheengine cooling system may
be neces sary,dependin gon theve hicle
model.
When retrof itti ng atrai le rhi tc h, ob serveth e
fa stening pointson thech assis . Re
trof itti ng atrai le rhi tc his pe rm issible onlyif a
trailer loadisspec ified inyour vehicle docu‐
ments. Ifth is is no tth ecase, theve hicle isno t
appr ovedfo rtr ail er oper ation.
Fu rther information canbeobt ained ataqu ali‐
fi ed specialis two rkshop.
If th etrailer coupling isremo vable, itis essent ial
to com plywith theoper ating instruction sof the
tr ai le rcou pling manuf actu rer.
Couple anduncouple thetrailer carefull y.Ifyo u
do notcon nectth etra iler totheto wing vehicle
cor rectl y,thetrailer maybecome detach ed. Obser
vethefo llo wing noteson theto ngu e
we ight :
R Donotuse ato ngu ewe ight that exceed sor
fa lls belo wtheper missible tongu ewe ight
R Use ato ngu ewe ight asclos eas possible to
th emaximum tongu ewe ight
Do notex ceed thefo llo wing values:
R Perm issible trailerload
R Perm issible rear axle load oftheto wing vehi‐
cle
R Perm issible gross weight oftheto wing vehi‐
cle
R Perm issible gros swe ight ofthetra iler
R Maximum permissible speedofthetrailer
En sur eth efo llo wing beforest ar tin gajo ur ne y:
R The tirepr essur eon there ar axle oftheto w‐
ing vehicle issetfo ra maximu mloa d
R The lighting ofthecon nect edtrailer isoper a‐
tion al
In theeve ntofincr eased rear axle load, theve hi‐
cle/tra ilercombination mayno texc eed amaxi‐ Dr
iving andparking 29
7

Ins
trum ent Disp layove rview
Mer cedes- AMGvehicl es:besur eto obser ve
th eno tesin theSupplement .Ot her wise, you
ma yfa ilto recogni zedangers. &
WARNIN GRisk ofacci dent dueto an
ins trumen tdispla ymalf unction
If th eIns trument Displayhas failed ormal‐
func tioned,youma yno tre cogni zefuncti on
re strictions applyi ngtosaf etyre leva nt sys‐
te ms.
The oper ating safetyof your vehicle maybe
im pair ed. #
Drive on car efull y. #
Have theve hicle checkedimmediat ely
at aqu alif ied spec ialistwo rkshop. If
th eoper ating safetyof your vehicle is
im pair ed,parkth eve hicle immediat elyand
saf ely. Con tact aqu alif ied spec ialistwo rkshop. Ins
trument Displayin theWi des cree nCo ck‐
pit 1
Spee dometer (exa mp le)
2 Multif unction displa y
3 Tach ome ter(e xa mp le)
4 Coolant temp eratur edispla y(e xa mp le)
5 Fuelleve l,fuel filler flap locatio nind icat or,
ra ng e
% Inadditio nto multifu nctiondisplay 2, fur‐
th er con tent can besho wnondispl ays1
and 3(/ page305). The
segments onspeedome ter1 indica tethe
sy stem status forth efo llo wing:
R Cruise control (/ page23 1)
R ActiveDis tan ceAssi stDIS TRONI C
(/ page 235)
* NO
TEEngi nedama gedue toexc essiv ely
high engine speeds The
engine willbedamag edifyo udr ive wit h
th eengine intheov errevving rang e. #
Donotdr ive wi th theengine intheove r‐
re vving rang e. The
fuelsu pp lywillbe interru pted toprotect the
engine whenthere dmar kon theta ch ome ter
(o ve rrev ving rang e) isreac hed.
Dur ing norm aloper atingcon dition s,coo lant
te mp eratur edispla y4 mayrise tothere d
mar k. Ins
trument Displayand on-boar dcom puter 30
1

&
WARNIN GDang erofburnswhen open‐
ing thehood
If yo uopen thehood when theengine has
ove rheat edordur ing afire intheengine
com partmen t,yo uco uld come intoco ntact
wit hho tga ses orother escaping operating
fl uids. #
Beforeopen ingthehood, allowthe
engine tocool down. #
Intheeve ntofafire intheengine com‐
par tmen t,ke ep thehood closed and
call thefire ser vice. Ve
hicl eswith a48 Von-b oardele ctrical sys‐
te m (EQ Boo sttech nology) 1
POWER showstheelectr icdrive suppor t
2 CHARGE sho wsthere cup erati on powe rof
th eelectr icmo tor
õ showsthedr ive sy stem's operational read‐
ine ss. Ov
ervie wof thebut tons on thest eer ing
wheel 1
P Back/Hom ebutt on,on-boar dcom ‐
put er
Pr ess and hold: showsstandar ddispla y
2 Touc hCon trol, on-bo ardco mp uter
3 Con trol pan elforcr uis econtr olor Active
Dis tance AssistDIS TRONI C
4 Contr olpa nel forMBUX multimediasy stem:
£ Voice Cont rolSy stem
ß Displa ysfavo rite s
VO L:contr olknob, adjuststhevo lume or
switc hesthesound off0063 (press) 302
Instrument Displayand on-boar dcom puter

Fu
rther displa yson themultifunc tiondispla y:
0097 Gear
shiftre comme ndation (/page 202)
u ActivePa rking Assist(/ page283)
é Parking AssistPA RK TRONI Cdeac tiva ted
( / pag e27 3)
î DSR(/page 233)
h Cruise contr ol(/ page23 1)
ç ActiveDis tance AssistDIS TRONI C
(/ page 235)
ê ActiveBr ak eAssi st(/ pag e23 1)
à ActiveSt eer ing Assis t(/ page24 2)
ð ActiveLa ne Keeping Assist(/ page29 4)
± ActiveLa ne Chang eAssi st(/ pag e24 4)
00D6 ECO
star t/ stop funct ion(/ page19 2)
00D9 HO
LD functio n(/ page 249)
00CE Ad
aptiveHig hbeam Assis t(/ page15 8)
Ve hicl eswith Traf fic Sign Assis t:De tected
ins tructi ons and traf fic sig ns (/ page 289) .
Fo ran overvie wof theindicat orand warning
lam ps,see (/page62 1). Ad
jus tingthe inst ru men tlighti ng #
Turn brightn esscontrol 1 upordown.
The lightin gof theIns trument Displayand in
th econ trol element sof theve hicle interior is
adjus ted. Menus
andsubmenu s Calling
upfunctions ontheSer vice menu of
th eon-boa rdcom puter On-boar
dcom puter:
4 Service #
Toselect afunction: swipeupwards or
do wn wardson thelef t-hand Touc hCon trol. #
Press thelef t-hand Touc hCon trol.
Fu nctio nson theServ icemenu:
R Messag ememor y(/ page56 7)
R Tires :
- Restar tth etir epr essur eloss warning
sy stem (/ page52 1)
- Chec kth etir epr essur ewit hth etir epr es‐
sur emonit or(/ page51 9)
- Restar tth etir epr essur emonit or
(/ page520)
R ASSYST PLUS: calluptheser vice duedate
(/ page47 6)
R Coo lant: cool anttemp eratur edispla y
R Engine OilLevel :engine oilleve l Ins
trument Displayand on-boar dcom puter 30
7

ASS
YSTPL US service interva ldisp lay Fu
nction oftheASS YSTPL US service interva l
displ ay The
ASSYSTPL US service interva ldispla yon the
Ins trument Displaypr ov ides informatio non the
re maini ngtime ordis tance before thene xt
ser vice duedate.
Yo ucan hide this ser vice displa yusing thebac k
butt ononthelef t-hand sideofthesteer ing
wheel.
Depen dingonhowtheve hicle isused, the
ASS YSTPL US service interva ldispla yma y
shor tenth eser vice interva l,e.g. inthefo llo wing
cases :
R Mainl yshor t-dis tance drivi ng
R Whe nth eengine isoftenleft idling forlong
per iods
R Intheeve ntoffreq uent col dstar tphase s
Mer cedes-Ben zre comme ndsavoiding such
oper ating condit ions.
Yo ucan obtain informat ionconcernin gth eser v‐
icing ofyour vehicle from aqu alif ied spec ialist wo
rkshop, e.g.anaut hor ized Mercedes-Benz
Cent er. Displa
yingtheser vice dueda te On-boar
dcom puter:
4 Service 5
ASS YST PLUS
The next ser vice duedateis displa yed. #
Toexitth edisp lay: press thebac kbutt on
on thelef t-hand sideofthesteer ing wheel.
Be sureto also payatt ent ion tothefo llo wing
re lat ed topic:
R Oper ating theon- boar dcom puter
(/ page303). Inf
ormat iononregular maintenance work *
NO
TEPrema turewe arthro ugh failur eto
obser veser vice duedates Ser
vice workwhic his no tcar ried out atthe
ri ght time orincom pletely can lead to
inc reased wearand damag eto theve hicle. #
Alw aysobser vethepr escr ibed service
int erva ls. #
Alw aysha ve thepr escr ibed service
wo rkcar ried out ataqu alif ied spec ialist
wo rkshop. Special
service requ irement s The
prescr ibed service interva lis based onnor ‐
mal opera tionoftheve hicle. Maintenance work
will needto be per form ed mor eof tenif th eve hi‐
cle isoper ated under arduous conditions or
incr eased loads.
The ASSYSTPL US service interva ldispla yis onl y
an aid. Thedriver oftheve hicle bearsre sponsi‐
bility asrega rdsto whe ther maint enanc ewo rk
nee dstobe per form ed mor eof tenth an spec i‐
fi ed based ontheactual operating conditions
and/or loads.
Ex am ples ofarduous operating conditions :
R regular citydriving withfreq uent intermedi‐
at estops
R mainly short-distance drivi ng 47
6
Maint enance andcare

R
freq uent operation inmount ainouste rrain or
on poor road sur faces
R whe nth eengine isoftenleft idling forlong
per iods
R oper ation inpar ticula rly dus tycond ition s
and /orif air -rec ircula tion mod eis freq uen tly
used
In these orsimilar operating conditions ,ha ve the
int erior airfilt er ,engin eair clean er,engin eoil
and oilfilt er etc. chang edmor efreq uent ly.The
tir es mus tbe checkedmor efreq uentl yif th e
ve hicle isoper ated under increased loads. Fur‐
th er information canbeobt ained ataqu alif ied
spec ialistwo rkshop. Batt
erydisconne ctionperiods The
ASSYSTPL US service interva ldisp lay
can onlycalculat eth eser vice dueda te when
th ebat tery isconnect ed. #
Notedown theser vice duedatedispla yedon
th eins trument displaybef orediscon necting
th ebatt ery(/ page47 6). Eng
inecomp artment Open
ing/clos ing thehood &
WARNIN GRisk ofacci dent ifth eengine
hood isunlatc hedwhile driving
An unloc kedengin ehood mayopen upwhen
th eve hicle isin mo tion andblockyo ur vie w. #
Neverunla tchth eengine hoodwhile
dr iving. #
Beforeev erytrip, ensur eth at the
engine hoodislatc hed. &
WARNIN GRisk ofacci dent andinjury
when openingand closingtheengine
hood
When opening orclosing theengine hood,it
ma ysuddenl ydr op intoth eend position .
Ther eis arisk ofinjur yfo ran yone inthe
engine hood's rang eof mo vement. #
Onlyopen orclose theengine hood
when ther ear eno per sons inthe
engine hood's rang eof mo vement. &
WARNIN GDang erofburnswhen open‐
ing thehood
If yo uopen thehood when theengine has
ove rheat edordur ing afire intheengine
com partmen t,yo uco uld come intoco ntact
wit hho tga ses orother escaping operating
fl uids. #
Beforeopen ingthehood, allowthe
engine tocool down. #
Intheeve ntofafire intheengine com‐
par tmen t,ke ep thehood closed and
call thefire ser vice. &
WARNIN GRisk ofinju rydue tomo ving
par ts
Cer tain com pone ntsin theengine compart‐
ment maycon tinue tomo veorsuddenly
mo veagain evenaf te rth eignition hasbeen
switc hedoff,e.g. thecooler fan.
Ma kesur eof thefo llo wing beforeper form ing
ta sk sin theengine compartmen t: #
Swi tchth eignition off. Maint
enanc eand care47
7

#
Neverto uc hth edang erzon esur round ‐
ing movingco mp onent parts,e.g. the
ro tatio nar ea ofthefa n. #
Remo vejewe lry and watche s. #
Keep items ofclo thing and hair away
fr om moving parts. &
WARNIN GRisk ofinju ryfrom touc hin g
co mp onent partsunder voltag e
The ignit ionsystem and thefuel injec tion
sy stem workund erhigh voltag e. Ifyo uto uc h
co mp onent partswhic har eunder voltag e,
yo uco uld recei vean elec tric shoc k. #
Neverto uc hco mp onent partsof the
ignit ionsystem orthefuel injec tionsys‐
te m when theignition isswitc hedon. &
WARNIN GRisk ofburnsfrom hotcom‐
ponent partsintheengine compartmen t
Cer tain com pone ntsin theengine compart‐
ment canbevery hot,e.g. theengine, the
ra diat orand partsof theex haus tsy stem. #
Allo wtheengine tocool down and only
to uc hco mp onent partsdescr ibedin
th efo llo wing. &
WARNIN GRisk ofinju ryfrom using the
winds hieldwiper swhile theengine hood
is open
When theengine hoodisopen andthewind‐
shield wipersar ese tin mo tion ,yo ucan be
tr apped bythewiper linkage. #
Alw aysswitc hof fth ewindshield wipers
and ignition beforeopening theengine
hood. Opening
thehood #
Torelease thehood, pullonhandle 1.
Closing thehood
* NO
TEDama getothehood If
th ehood isclosed manually ,th er eis arisk
of dents. 47
8
Maint enance andcare

#
Donotclo sethehood manuall y. #
Push handle 1ofthehood catchupw ards
and liftth ehood byappr oximat ely15 in
(40 cm). #
Lowe rth ehood toaheigh tof aroun d8 in
(20 cm)and then allo witto fall, appl ying a
litt leforc eas youletit go. #
Ifth ehood canstill be lifte dslightl y,open
th ehood again and close itwit halittle more
fo rc euntil iteng ages cor rectl y. Engine
oil Chec
kingtheengine oilleve lusing theon-
boar dcom puter
Re quirement s:
R The engin ehas warmed up.
R The vehicle ispar kedon aleve lsur face.
R The engineisrunning atidle spe ed.
The engineoille ve lis de term ined during drivin g.
De term inin gth eengine oilleve lcan take up to
30 minut eswit hanor mal driving style and even
long erwit han activ edr iving style.
On- boar dcom puter:
4 Service5
Engine OilLevel
Yo uwill see oneof thefo llo wing mess ages on
th emultifunc tiondispla y:
R Measuring Engine OilLevel.. .:measur ement
of theoil leve lis no tye tpo ssi ble. #
Repeat there qu estaf te ra maximu mof
30 minut esdriving.
R Engine OilLevel OKand thebar displa yfo r
indic atingth eoil leve lon themultifunc tion
displa yis green and isbe tween "min" and
"max": theoil leve lis cor rect.
R Engine OilLeve lAdd 1,1qts. andthebar dis‐
pla yfo rindica tingtheoil leve lon themulti‐
func tion displa yis orang eand isbelo w"min": #
Add1.1 US qt(1l)of engine oil.
R Red uce Engine OilLevel andthebar displa y
fo rindica tingtheoil leve lon themultifunc ‐
tion displa yis orang eand isabo ve"max ": #
Drain offan yex cess engineoilthat has been
added. Todo so, con sult aqu alif ied spec ialist
wo rkshop.
R For Engine OilLevel Switch Ignition On: #
Switc hon theignition tocheckth eengine oil
le ve l.
R Engine OilLeve lSyst emInoperat ive:sensor
fa ulty ornotins erted. Maint
enanc eand care47
9

#
Con sult aqu alif ied spec ialistwo rkshop.
R Engine OilLevel System Currently Unavail.: #
Close thehood.
Re filling engine oil &
WARNIN GRisk ofburnsfrom hotcom‐
ponent partsintheengine compartmen t
Cer tain com pone ntsin theengine compart‐
ment canbevery hot,e.g. theengine, the
ra diat orand partsof theex haus tsy stem. #
Allo wtheengine tocool down and only
to uc hco mp onent partsdescr ibedin
th efo llo wing. &
WARNIN GRisk offire and injuryfrom
eng ineoil
If eng ineoilcom esintocon tact with hot
com ponent partsintheengine compart‐
ment ,it ma yignit e. #
Mak esur eth at no eng ineoilisspille d
ne xt to thefiller open ing. #
Allo wtheengine tocool offand thor‐
oughl yclean theengine oilfrom com po‐
nen tpar tsbef orest ar tin gth eve hicle. *
NO
TEEngi nedama gecau sed byan
inc orrect oil filt er ,inc orrect oil oraddi‐
tiv es #
Donotus eengi neoilsor oil filt er s
whic hdo notcor respond tothespecif i‐
cation sex plicitl ypr escr ibed forth e
ser vice interva ls. #
Donotalt er theengine oiloroil filt er in
or der toachie velong erchang eint erva ls
th an presc ribed. #
Donotuse additiv es. #
Followtheins truction sin theser vice
int erva ldispla yre ga rding theoil
ch ang e. *
NO
TEDama gecau sed byrefilling too
muc hengine oil To
omuc hengine oilcan damag eth eengine
or thecat alytic converter . #
Have excess engineoilremo vedat a
qu alif ied spec ialistwo rkshop. %
Depending ontheengine, thecap maybe
ins talled intheengine compartmen tin dif‐
fe re nt locati ons. 48
0
Ma intena nce and care

#
Turn cap 1cou nter-cloc kwiseand remo ve
it. #
Addengin eoil. #
Replace cap1and turnit cloc kwise asfar
as itwill go. #
Chec kth eoil leve lag ain (/ page47 9). Ch
ecking thecoolant leve l &
WARNIN GRisk ofburnsfrom hotcom‐
ponent partsintheengine compartmen t
Cer tain com pone ntsin theengine compart‐
ment canbevery hot,e.g. theengine, the
ra diat orand partsof theex haus tsy stem. #
Allo wtheengine tocool down and only
to uc hco mp onent partsdescr ibedin
th efo llo wing. &
WARNIN GRisk ofscal ding from hot
cool ant
The enginecool ingsystem ispressur ized,
par ticular lywhen theengine iswa rm.If yo u
open thecap, youco uld bescalded byhot
coolant spraying out. #
Letth eengine cooldown beforeopen‐
ing thecap. #
When opening thecap, wearprotect ive
gl ove sand safetygl asses . #
Open thecap slowlyto release pres‐
sur e. #
Park theve hicle onaleve lsur face. #
Checkth ecoolant temp eratur edispla yin the
ins trumen tclus ter.
The coolant temp eratur emus tbe inthebo t‐
to m quarterof thete mp eratur edispla y. #
Slowly turncap 1cou nter-clo ckwise to
re lease overpressur e. Maint
enance andcare48
1