light MERCEDES-BENZ GLA 2020 Repair Manual

Problem
Possible
causes/co nsequences and0050 0050
Solutions The
engine isnot run-
ning smoothly andis
misfiring. There
isamalfunction inthe engine electron icsorinamechanical
componen tof the engine management system.
X Only depress theaccelerator pedalslightly.
Otherwise, non-combusted fuelmay getinto thecatalytic con-
verter anddamage it.
X Have thecause rectified immediately ataqual ified specialist
workshop. The
coolant tempera-
ture gauge shows a
value above 248‡
(120 †).The warning
lamp mayalsobeon
and awarning tonemay
sound. The
coolant levelistoo low. Thecoolant istoo hotand theengine is
no longer beingcooled sufficiently.
X Stop assoon aspossible andallow theengine andthecoolant to
cool down.
X Check thecoolant level(Ypage 277). Observe thewarning notes
as you dosoand add coolant ifnecessary. Notes
ontowing vehicles
The vehicle isnot suitable forattaching tow
bar systems, suchasthose usedforflat tow-
ing ordinghy towing.
Att aching orusing towbarsystems mayresult
in damage tothe vehicle.
When towing avehicle withtowbarsystems,
safe driving characterist icscannot beguaran-
teed forthe towing vehicle orthe towed vehi-
cle.
The vehicle/trailer combinationmayswerve.
Observe thepermissible towingmethods
(Y page 301)andthenotes ontowing with
both axles onthe ground (Ypage 301). DYNAMIC
SELECTbutt on(all vehi-
cles except Mercedes-AMG vehicles)
Use theDYNAMIC SELECTbutton tochange
the drive program. Depending onthe drive pro-
gram selected thefollowing vehiclecharacter-
istics willchange:
R the drive (engine andtransmission manage-
ment)
R the sound ofthe exhaust system(vehicles
with sports exhaust system)
R the steering
R the availa bilityofthe ECO start/ stopfunc-
tion
R the climate control Each
timeyoustart theengine withtheSmart-
Key orthe Start /Stopbutton, driveprogram C
is activated. Forfurther information about
startin gthe engine, see(Ypage 126). X
Press DYNAMIC SELECTbutton 0043asmany
times asnecessary untilthedesired drive
program isselected.
The selected driveprogram appearsinthe
multifunct iondisplay .Aft erfive seconds, the
display goesoutand thestatus symbol of
the selected driveprogram appears.
In addition, thecurrent driveprogram set-
tings aredisplay edbriefly inthe multimedia
system display.
i In
afew countr ies,theECO start/ stop
funct ionisdeactivated atthe factory dueto
the availa blefuel grade. Inthis case, the
ECO start/ stopfunct ionisnot availa blein
any drive program, regardless ofthe display
in the multimedia systemdisplay. 132
DY
NAMIC SELECTbutt on(all vehicl esexce ptMercedes-AMG vehicles)Driving andparking

Avai
labledr ive progr ams: C
Comf ort Comf
ortable andeconomi-
cal driv ingcharac teris tic s S
Spo rt Spo
rty driv ingcharac teris -
tic s I
In divi dual In
divi dual settings Off
-road Opt
imal drivingcharac ter-
ist ics foreasily negot iable
off -road terrain E
Ec on omy Part
icular lyeco nomic al
driv ingcharac teris tic s Ad
dition alinf orm ationfor driv epro gram s
(Y page 138).
You canalso chang egear yours elfusin gth e
st eer ing wheel paddle shifters. For further
inf orm ationon theman ualdriv epro gram
(Y page 140). DYNAM
ICSELECT controller
(Mer cedes -AMGvehi cles)
Use theDYN AMICSELECT controll erto
ch ang eth edriv epro gram .De pen dingon the
driv epro gram selected thefoll owin gveh icle
ch arac teris tic swill chang e:
R thedriv e
R thetrans mis sion managem ent
R ES P®
R thesuspe nsion (veh icleswit hAM Gadapt ive
spor tsuspe nsion syst em)
R thesoun dof theex haust system
R theavailab ilityof theECO start /stopfun c-
tio n
R theavailab ilityof glidin gmod e
Eac htim eyou start theen gin ewit hth eSm art-
Key ortheSt art /S topbut ton, driv epro gram C
is act ivat ed. For further inform ationabout
st art ing theen gin e,see (Ypage 126). X
Turn DYNAMICSELECT controll er0043 as
man ytim esasneces sary untilth edesir ed
driv epro gram issele cted.
The selected driv epro gram appear sin the
mult ifunction displ ay.Afterfiv esec onds the
displ aygoes outand thesymb olof the
sele cted driv epro gram appear s.
The drivepro gram indicat oron DYN AMIC
SE LECT controll er0043 light sup inred .
Avai labledr ive progr ams: I
In divi dual In
divi dual settings C
Comf ort Comf
ort-orien ted, opt i-
mum -eco no my engin eand
tr ans mis sion settings S
Spo rt Spo
rty en gin eand trans -
mis sion settings S+
Spo rtPlus Part
icular lyspor tytrans -
mis sion settings Ra
ce Max
imum sportiness and
en gin eand trans mis sion
set tings suit able forthe
rac etrac k Ad
dition alinf orm ationfor driv epro gram s
(Y page 138).
You canalso chang egear yours elfusin gth e
st eer ing wheel paddle shifters. For further
inf orm ationon theman ualdriv epro gram
(Y page 140). DYNAMIC
SELECTcontroller(Mercedes- AMGvehicles)
133Drivingand parking Z

Opening
thefuel filler flap 0043
Toopen thefuel filler flap
0044 Tire pressure table
0087 Toinsert thefuel filler cap
0085 Instruct ionlabel forfuel type tobe refu-
eled
X Switc hoff the engine .
X Remove theSmart Keyfrom theignition
lock.
or, invehicles withKEYLE SS-GO start -function
or KEYLE SS‑GO
X Open thedriver's door.
The vehicle electronics arenow inposition
005A. This isthe same asthe Smart Keyhaving
been removed.
X Press thefuel filler flapinthe direct ionof
arrow 0043.
The fuel filler flapswings up. X
Turn thefuel filler capcount er-clockwise
and remove it.
X Inser tthe fuel filler capinto theholder on
the inside offuel filler flap0087.
X Completely insertthefiller neck ofthe fuel
pump nozzleinto thetank ,hook inplace
and refuel.
X Only fillthe tank untilthepump nozzle
switches off.
i Do
not add anymore fuelafter thepump
stops fillingforthe first time. Otherwise, fuel
may leakout.
Closing thefuel filler flap X
Replace thecap onthe filler neck andturn
clock wiseuntilitengages audibly.
X Close thefuel filler flap.
Close thefuel filler flapbefore lockingthe
vehicle.
If you aredriving withthefuel filler capopen,
the 00B6 reserv efuel warning lampflashes. A
message appearsinthe multifunc tiondisplay
(Y page 219).
In addition, the00B9 Check Engine warning
lamp maylight up(Ypage 239).
For furth erinfor mation onwarning andindica-
tor lamps inthe instrument cluster,see
(Y page 239). 144
RefuelingDriving
andparking

Add
itiona lly, chi ldren couldset the vehiclein
moti onif,for exa mpl e,they :
R rel ease the parking brake
R shi ftthe automa tictrans mission outof
pa rk positio n005D
R sta rtthe engine
The reisaris kof an acci dent and injury.
Nev erleav echi ldren orani ma lsuna ttend ed
in the vehicle.
Whe nleav ing the vehicle, alwa ystake the
Sma rtKeywi th youand lock the vehicle. Thi s
al so appliesfor the DigitalVeh icleKey ifthe
"Di gital Veh icleKey "fu nctio nis acti vated via
Mer cedesme conne ct.
The functio nof the electri cpa rking brakeis
de pende nton the on-b oard vol tag e.Ifthe on-
bo ardvol tag eis low or ther eis ama lfunctio n
in the system ,it ma ynot bepossi ble to apply
the released parking brake.
X Ifthi sis the case,onl ypa rk the vehicleon
le vel ground andsecureit to pre vent itrol l-
ing away.
X Shi ftthe automa tictrans mission topositio n
005D.
It ma ynot bepossi ble to release an applied
pa rking brakeifthe on-b oard vol tag eis low or
ther eis ama lfunctio nin the system .Co ntact a
qu alifi ed spe cialist wo rksh op.
The electri cpa rking brakeperfor ms afu nctio n
test atreg ular inte rvalswh ile the engineis
sw itch edoff. The sounds thatcan behea rd
wh ile thi sis occu rring arenorma l.
Appl ying orreleas ingmanua lly X
To apply :pu sh handl e0043.
Whe nthe electri cpa rking brakeisap plied,
the red 0049 (USAonl y)or 0024 (Cana da
onl y)ind icator lamp lights upinthe instru-
ment cluster .
The electri cpa rking brakecan also be
ap plied wh en the Sma rtKeyis rem oved.
X To releas e:pullha ndl e0043.
The red0049 (USAonl y)or 0024 (Cana da
onl y)ind icator lamp inthe instrum entclus-
ter goe sou t.
The electri cpa rking brakecan onlybe
rel eased :
R ifthe Sma rtKeyis in po sitio n0047 or0048 in
the igniti onlock (Ypage 125 )or
R ifthe igniti onwassw itch edon using the
Star t/Stop button
Appl ying auto matic ally The
electri cpa rking brakeisau toma tically
ap plied wh en the trans mission isin po sitio n
005D and :
R the engineissw itch edoff or
R the driver isnot wearing asea tbe ltand the
dri ver 'sdo or isop ene d
To pre vent theelectri cpa rking brakefrom
be ing automa tically ap plied, pu llha ndl e0043.
The electri cpa rking brakeisalso applied au to-
ma tica lly if:
R Active Distance AssistDISTR ONICbri ngs
the vehicleto asta ndsti llor
R The HOLD functio nis kee ping the vehicle
sta tionar y
R Active Parking Assistiskee ping the vehicle
sta tionar y
In additio n,at leas tone ofthe followi ng cond i-
tio ns mu stbe fulfilled :
R The engineissw itch edoff
R The driver isnot wearing asea tbe ltand the
dri ver 'sdo or isop ene d
R The reisasy stem malfunctio n
R The powe rsu pp lyisins uffici ent
R The vehicleis sta tionar yfor along perio dof
time
The red0049 (USAonl y)or 0024 (Cana da
onl y)ind icator lamp inthe instrum entcluster
goe sou t. Parki
ng
147Dr ivi ng andparki ng Z

when
thetraffic situation permits.If you are
unsur e,pull over toasafe locat ionand stop
befo reoper atingth etele phon e.
Bear inmin dth at ataspeed ofonly 30mph
(appro ximately 50km/h), thevehic lecov ers a
dist anceof 44 ft(appro ximately 14m)per
sec ond .
Drive sensibly –sav efuel Obser
vethefollo wing tipstosave fuel:
R The tires should always beinflated tothe
rec omm endedtirepres sure.
R Remov eunn eces sary loads.
R Remov eroof rackswhen they are not nee-
ded.
R Warm uptheeng ineatlow enginespeeds .
R Av oid frequent accelerat ionorbrak ing.
R Have allmain tenanc ework carried outas
indic ated bytheserv iceinterv als inthe
Maint enanceBoo klet orby theserv iceinter-
val display.
Fuel consumpt ionalso increase swhen driving
in cold weath er,instop- start traffic andinhilly
ter rain .
Drink ingand driving G
WAR
NING
Dr ink ing and drivingand/ ortak ing drugs
and drivingare verydang erous combina-
tio ns.Ev en asmall amoun tof alcoh olor
drugs canaffectyour reflexe s,perc eptions
and judg men t.
The poss ibilityof aserio usoreven fatal
acc iden tis great lyinc rease dwhen youdrink
or tak edrugs anddrive.
Do not drinkor tak edrugs anddriveor allow
anyon eto driv ewho hasbeen drinkingor
tak ing drugs .
Emiss ioncontr ol G
DANGER
Combust ionengines emit poison ous
exh aust gases suchascar bon mon oxide.
In halin gth ese exhaust gases ishazar dous to
healt hand canresult inpoison ing.Ther eis a
risk offat alinj ury. Ther efore,nev erleave the eng
inerunningan enc losed spacewith out
adequat even tilat ion.
Cert aineng inesyst ems aredesign edtokee p
th elevel ofpoison ouscom ponentsin exh aust
fume swith inlegal limits.
These systems onlywork atpeak efficien cyif
th ey are serv iced exactlyinacc ordan cewith
th eman ufact urer'sspec ification s.Always have
work ontheeng inecarried outataqualified
spec ialist workshop. Mercedes- Benzrec om-
men dsthat you useanautho rized Merc edes-
Ben zCent erfor this purpos e.In part icular ,
work relevanttosafet yor on safet y-relate d
syst ems must becar ried outataqualified spe-
cialis twork shop.
The enginesettings must notbechan ged
under anycircums tances .Furt herm ore,all
spec ificserv icework must becar ried outat
regular interv als and inacc ordan cewith the
Merc edes- Benzserv icerequir ements.Det ails
can befoun din theMaint enanceBoo klet. ECO
display
The ECO display showsyouhow econom ical
your drivingstyle is.The ECO display assists
you inachie vingth emost econom icaldriving
st yle fortheselec tedsettings and prev ailing
con ditions .Your drivingstyle can significant ly
inf luenc eth evehic le'sconsumpt ion. 0043
Accele ration
0044 Coast ing
0087 Cons tant
0085 Add itional rangeachie ved
Range 0085isshown underBonusfr. Start Bonu
sfr. Start
and represen tstheaddit ional rangeachie ved
sin ce thebegin ningof thejour ney asaresult
of an adapte ddriv ingstyle.
If th efuel level hasdropp edintoth erese rve
ran ge, theFuel Low Fuel
Lowmess ageisshown inthe
mult ifunction display instead ofran ge0085. The
00B6 warninglamp intheins trumen tclust er
also lightsup (Ypage 239). Drivin
gtip s
149Driving andparking Z

The
ECO display consistsof three section s,
with aninner andouter area.Thesection scor-
respond tothe following threecategories: 0043
Acce
leration (evaluation ofthe
acceleration processes):
R the outer areafillsupand the
inner arealights upgreen: moder-
ate acceleration ,especially at
higher speeds
R the outer areaempties andthe
inner areaisgray: sporty acceler-
ation 0044
Coasting
(evaluation ofall deceler-
ation processes):
R the outer areafillsupand the
inner arealights upgreen: antici-
patory driving, keeping yourdis-
tanc eand early release ofthe
accelerator. Thevehicle can
coast without useofthe brakes.
R the outer areaempties andthe
inner areaisgray: frequent heavy
braking 0087
Constant
(continuous evaluation
over theentir ejourney):
R the outer areafillsupand the
inner arealights upgreen: con-
stant speed andavoidance of
unnec essary acceleration and
deceleration
R the outer areaempties andthe
inner areaisgray: fluctuations in
speed The
three innerareas display thecurrent driv-
ing style andlight upgreen asaresult ofapar-
ticularly economicaldriving style.Dependin g
on the driving situation, uptotwo areas may
light upsimultaneously.
At the beginning ofthe journey, thethree
outer areas areempty andfillup asaresult of
econom icaldriving. Ahigher levelindicates a
more econom icaldriving style.Ifthe three
outer areas arecompletely filledatthe same
time, thedriver hasadopted themost eco-
nomical drivingstyleforthe selected settings
and prevailing conditions.TheECO display
border lightsup.
The ECO display doesnotindicate theactual
fuel consumpt ion.Theadditionally achieved range
display edunder Bonus fr.Start Bonus
fr.Start does
not indicate afixed consumpt ionreduction .
In addition todriving style,theactual con-
sumption isaffect edbyother factors,such as:
R Load
R Tire pressure
R Cold start
R Choice ofroute
R Act ive electric alconsumer s
These factorsare not included inthe ECO dis-
play.
An econom icaldriving stylespecially requires
driving atmoderate enginespeeds.
Achievin gahigher valueinthe categories
"Accelerat ion"and"Constant ":
R observe thegearshift recommendations .
R drive thevehicle indrive program Cor E
(vehicles withaDYNA MICSELECT button ).
On long journeys ataconst antspeed, e.g.on
the highway, onlytheouter areafor"const ant"
will change.
The ECO display summarizes thedriving style
from thestart ofthe journey toits completion .
Therefore, therearemore marked changes in
the outer areas atthe start ofajourney. On
longer journeys, therearefewer changes. For
more marked changes, performamanual rest
(Y page 193).
For more inform ationonthe ECO display ,see
(Y page 192). Br
aking
Import antsafety notes G
WARNIN
G
If you shift down onaslippery roadsurface
in an attempt toincrease theengine's brak-
ing effect ,the drive wheels couldlosetheir
grip. There isan increased dangerofskid-
ding andaccident s.
Do not shift down foradditional enginebrak-
ing onaslippery roadsurface.
Dow nhill gradients !
On
long andsteep gradients, youmust
reduce theload onthe brakes byshiftin gto
a lower gearingood time. Thisallows youto 150
Driving
tipsDriving andparking

take
advantag eof eng inebraking .For this
yo umu stfirst acti vate ma nua lge arshi ftin g.
Thi she lpsyo uto avoid ove rheating the
bra kes and wearing themoutexce ssivel y.
Wh enyoutake advantag eof eng inebraking ,
it is po ssi ble tha ta dri ve wheelwi llnot
rota tefor som etim e,e.g .on aslip pe ry roa d
su rfa ce. Thiscou ldcau sedama getothe
dri ve train. Thistyp eof dama geisnot cov-
ere dby the Merced es-Benz warranty.
Bri eflyde pre ssing the accelera tor pedalon
do wnh ill gra dients while the manua ldri ve pro -
gra mM istemp orarilyacti vated :the automa tic
tra nsmi ssion maysw itch tothe last acti ve
au toma ticdrive pro gramEor S.The automa tic
tra nsmi ssion mayshi ftto ahighe rge ar.Thi s
can reduce theengine'sbra king effect.
He avy and light loads G
WA
RNING
If yo ures tyo ur foo ton the brakepedal
wh ile dri vin g,the braking syste mcan over-
he at. Thisincr easesthe stop ping dista nce
and canevencau sethe braking syste mto
fa il. The reisaris kof an acc ident.
Nev erusethe brakepedalas afoo tres t.
Nev erdepre ssthe brakepedaland the
acc elera tor pedalat the same time.
! Dep
ressing the brakepedalcons tantly
res ults inexce ssive and prematurewe arto
the brakepads.
If the brakes have been subje cted toahe avy
lo ad ,do not stop thevehicleim med iatel y.
Dri veon for asho rtwh ile. Thi sal lo ws the air-
flo wto coo lthe brakes morequ ickl y.
We troad s If
yo uha ve driven foralong tim ein he avyra in
wi thou tbra king ,the rema ybe ade laye drea c-
tio nfro mthe brakes when bra king forthe first
tim e.Thi sma yal so occu raf ter the vehicleha s
be en washe dor driven throughde ep water.
Yo uha ve todepre ssthe brakepedalmor e
fir ml y.Ma inta inagre aterdi sta nce fromthe
veh iclein fro nt.
After drivin gon awe troa dor havin gthe vehi-
cle washe d,bra kefirml ywh ile pa ying atte ntion
to the trafficcond itions .Thi swi llwa rm upthe bra
kediscs ,the reb ydry ing themmor equ ickl y
and protecti ngthe magainst corr osion.
Li mite dbrak ingperf orman ceon salt-
treate droad s If
yo udri ve on salte droa ds,a laye rof saltres i-
du ema yfor mon the brakediscs and brake
pa ds.Th iscan resultin asigni ficantl ylo nge r
bra king dista nce.
R In ord erto pre vent anysaltbu ild-u p,apply
the brakes occa siona lly wh ile pa ying atte n-
tio nto the trafficcond itions .
R Ca ref ully de pre ssthe brakepedaland the
be ginning andend ofajou rney .
R Ma inta inagre aterdi sta nce tothe vehicle
ah ead.
Se rvi cing the brak es !
Th
ebra kefluidlevel maybe too low, if:
R ifthe red brakewarning lamp lights upin
the instrument cluste rand
R youhe ar awa rning tone while the engine
is running
Ob serve additio nal warning mes sage sin the
mu ltifu nctio ndisp lay.
Th ebra kefluidlevel maybe too low du eto
bra kepadwe aror leaki ng bra kelines .
Hav ethe brakesyste mche cked immed i-
ate ly.Co nsu ltaqu alifi ed speci alistwo rk-
sho pto arrange this.
! A
functio nor perfo rma nce testsho uld onl y
be car riedou ton a2-a xle dynam ome ter.If
yo uwi sh toopera tethe vehicleon such a
dy nam ome ter,plea se cons ulta qu alifi ed
sp eci alistwo rksh opinad vance. Youcou ld
othe rwise da ma gethe drive trainor the
bra kesyste m.
! As
the ESP ®
sy ste mopera tes automa ti-
cal ly,the engineand theigniti onmu stbe
sw itch edoff (theSma rtKeymu stbe inpo si-
tio n0092 or0047 inthe igniti onlock), ifthe
el ectr icpa rki ng bra keistes ted onabra king
dy nam ome ter(ma ximum 10second s).
Bra king triggered automa tically by ESP ®
ma ycau sesever eda ma getothe brakesys-
tem.
All che cks and mainte nanc ewo rkon the brake
sy ste mmu stbe car riedou tat aqu alifi ed spe-
cia list wo rksh op. Dr
ivi ng tips
151Dr ivi ng andparki ng Z

R
Driv eslow lyand evenly,if nece ssaryat a
wa lking pace.
R Ensu retha tthe wheelsarein conta ctwith
the ground atalltime s.
R Driv ewi th extre mecareon unf amilia roff -
roa drou tes where visibility ispo or. For
sa fety reasons ,ge tou tof the vehiclefir st
and surve ythe off-roa drou te.
R Ch eck thedepth ofwa ter befor efor ding riv-
ers and streams.
R Wa tch outfor obsta cles.
R Take car ewh en turning onanuphillor
do wnh ill sl op eor wh en drivin gacr oss a
sl op e.The vehiclecou ldothe rwise tip ove r.
R Alw ayskee pthe side windo wsand thepan-
ora ma roofwi th powe rtil t/sl iding panel
clo sed durin gthe journey .
R Do not devia tefro mma rked routes.
R Do not usethe HOLD functio nwh en drivin g
off -roa d,on stee pup hillor downh ill gra di-
ents oron slip pe ry or loose surfa ces .The
HOLD functio ncanno thol dthe vehicleon
su ch surfa ces .
Ch eckli st before driv ingof f-ro ad X
En gine oille ve l:che ckthe engineoille vel
and addoilif nece ssary.
Wh endrivin gon stee pgra dients ,the engine
oi lle vel mustbe sufficie ntly high toens urea
corr ectoilsu pp lyin the vehicle.
X Whe elsand tires:che ckthe tire trea d
de pth and tirepressu re.
X Ch eck fordama geand remove anyforeign
ob jects ,e.g .sma llstone s,fro mthe wheels/
tire s.
X Re place anymissing valve cap s.
X Re place dented ordama gedwh eels.
X Rims :de nted orbent rim scan resultin a
lo ss oftire pressu reand dama gethe tire
be ad.Befo redrivin goff -roa d,che ckthe
wh eelsand replace the mifnece ssary.
Ch eckli st afte rdriv ingof f-ro ad !
If
yo ude tect dama getothe vehicleaf ter
dri vin goff -roa d,have the vehicleche cked
imm ediatel yat aqu alifi ed speci alistwo rk-
sho p.
X Dea ctivate off-roa dpro gram(Y page 132) .
X Dea ctivate DSR (Ypage 169 ). X
Clea nthe headlamps andrearlights and
che ckfor dama ge.
X Clea nthe frontand rearlicens eplate s.
X Clea nthe wheelsand tireswi th awa ter jet
and remove anyforeign objects .
X Clea nthe wheels,wh eelhou sings and the
veh icleund erside wi th awa ter jet; checkfor
any foreign objects anddama ge.
X Ch eck wheth ertwi gsorothe rpa rts ofplants
ha ve become trapped.The seincr ease the
ris kof fireand candama gefuel pipe s,bra ke
hos esorthe airbe llow sof the axlejoi nts
and propeller sha fts.
X After thetrip,exa min ewi thou tfa ilthe entire
und erca rriag e, wh eels,tire s,bra kes ,bo dy-
wo rkstru ctur e,stee ring,cha ssisand
exh aust system fordama ge.
X After drivin gin sand, mud,gra vel,wa ter or
si mil ardirty cond itions, have the followi ng
che cked andcleane d:
R bra kediscs
R wh eels
R bra kepads
R axl ejoi nts
X Ifyo ude tect strongvibratio ns after off-roa d
tra vel ,che ckfor foreign objects inthe
wh eelsand drive trainand remove themif
nece ssary.Fore ign ob jects candistu rbthe
ba lance and causevibratio ns.
Driv ingoverpo or roa dsu rfa ces place sgre ater
de ma nds onyour veh icletha ndri vin gon nor-
ma lroa ds.After drivin goff -roa d,che ckthe
veh icle. Thi sal lo ws youto detect dama ge
pro mptl yand reduce theriskof an acc ident to
yo ursel fand othe rroa dus ers .
Dri ving on san d Ob
ser vethe followi ng ruleswh en drivin gon
sa nd:
R Activ atethe off-roa dpro gram(Y page 132 ).
R Avoi dhigh eng inespee ds.
R Use theleft-ha ndstee ringwh eelpa dd le
shi fter toshi ftto alowe rge ar appro priate to
the terrain. Dr
ivi ng tips
155Dr ivi ng andparki ng Z

sound
andthedistance warninglampwilllight
up inthe instrument cluster.Brakeimmedi-
ately inorder toincrease thedistance tothe
vehicle infront ortake evasive actionprovided
it is safe todo so.
Act ive Distance AssistDISTRONIC operatesin
the speed rangebetween 0mph (0km/h) and
120 mph (200km/h) .
Change intoalower gearingood timeonlong
and steep downhill gradients. Thisisespeciall y
important ifthe vehicle isladen. Bydoing so,
you willmake useofthe braking effectofthe
engine. Thisrelieves theload onthe brake sys-
tem andprevents thebrakes fromoverheating
and wearing tooquickly.
Do not use Active Distance AssistDISTRONIC
on roads withsteep gradients.
For Active Distance AssistDISTRONIC to
assist youwhen driving, theradar sensor sys-
tem must beoperational.
As Act ive Distance AssistDISTRONIC trans-
mits radar waves, itcan resemble theradar
detectors ofthe responsible authorities.You
can refer tothe relevant chapterinthe Opera-
tor's Manual ifquestions areasked aboutthis.
i USA
only: Thisdevice hasbeen approved
by the FCC asa"Vehicul arRada rSystem".
The radar sensor isintended foruse inan
automotive radarsystem only.Removal,
tampering, oraltering ofthe device willvoid
any warranties, andisnot permitted bythe
FCC. Donot tamper with,alter, oruse inany
non- approved way.
Any unauthorized modificationtothis device
could voidtheuser's authority tooperate
the equip ment.
i Canada
only:Thisdevice complies with
RSS-21 0of Industry Canada.Operation is
subject tothe followi ngtwo conditions:
1. This device maynotcause interferen ce,
and
2. This device mustaccept anyinterferen ce
received, includinginterferen cethat may
cause undesired operationofthe device.
Removal, tampering, oraltering ofthe
device willvoid anywarranties, andisnot
permitted. Donot tamper with,alter, oruse
in any non- approved way.
Any unauthorized modificationtothis device
could voidtheuser's authority tooperate
the equip ment. Importa
ntsafety notes G
WARNING
Act ive Distance AssistDISTRONIC doesnot
react to:
R people oranimals
R stationary objectsinthe road, e.g.stop-
ped orparked vehicles
R oncoming vehiclesandcrossing traffic
As aresult, Active Distance Assist
DISTRONIC mayneither givewarnings nor
intervene insuch situations. Thereisarisk
of an accident.
Always paycareful attentiontothe traffic
situation andbeready tobrake. G
WARNING
Act ive Distance AssistDISTRONIC cannot
alwa ysclearly identify otherroadusers and
complex trafficsituations.
In such cases, Active Distance Assist
DISTRONIC can:
R give anunnecessary warningandthen
brake thevehicle
R neither giveawarning norintervene
R accelerate orbrake unexpectedly
There isarisk ofan accident.
Continue todrive carefully andbeready to
brake, especial lyifAct ive Distance Assist
DISTRONIC warnsyou. G
WARNING
Act ive Distance AssistDISTRONIC brakes
your vehicle withupto50% ofthe maximum
possible deceleration. Ifthis deceleration is
not sufficient, Active Distance Assist
DISTRONIC alertsyouwith avisual and
acoustic warning. Thereisarisk ofan acci-
dent.
Adjust yourspeed inthese cases andmain-
tain sufficient distance.
Apply thebrakes yourselfand/or takeeva-
sive action. Driving
systems
159Drivingandparking Z

in
fro nton the edge ofthe road because of
its narr owwidth. Thedistanceto the vehic le
in fro ntwill betoo shor t.
R Obst acles andstationar yvehic les:Active
Dist anceAss istDISTRON ICdoes notbrak e
for obst acles orstat ionar yvehic les.If,for
exam ple,thedete cted vehic leturn sa cor -
ner and anobst acle orstat ionar yvehic leis
reve aled, ActiveDist anceAss istDISTRON IC
will notbrak efor them.
R Ac tiveDist anceAss istDISTRON ICmay mis-
tak enly detectvehic lesthat arecrossin g
your lane. Ifyou activate ActiveDist ance
Ass istDISTRON ICunder thefollowin gcon di-
tion s,the vehic lecould pullaway uninten-
tion ally:
- at traffic lightswith crossin gtraffic ,for
exam ple
- ifthe reisavehic lein fro nt,aft eracro ss-
ing, with theHOL Dfunc tion activate d
In such situat ions,brak eif nec essary. Active
Dist anceAss istDISTRON ICwill thenbe deact i-
vate d. HOLD
function
Gener alnotes The
HOL Dfunc tion canassist thedrive rin the
followin gsituat ions:
R When pulling away,especiallyonsteep
slopes
R When maneuverin gon steep slopes
R When waitingin traffic
The vehic leiskept stationar ywitho utthe
drive rhavin gto depres sthe brak epedal.
The brak ingeffe ctiscan celed andtheHOL D
func tion deact ivatedwhen youdepres sthe
acc elerat orpedal topull away. Imp
ortant safety notes G
WARN
ING
If the vehic leisonly brakedusing theHOL D
func tion,the vehic lemay rollaway inthe fol-
lowing situationswhen youleave thevehi-
cle:
R ifthe reisamalfun ction inthe syst emor
in the voltage supply
R ifthe HOL Dfunc tion isdeact ivatedby
depres singtheaccelerat orpedal orbrak e
pedal, e.g.byavehic leocc upant
There isarisk ofan acc ident .
Always deactivatethe HOL Dfunc tion and
secur ethe vehic leagainst rollingaway
befor eyou leave it.
! When
ActiveDist anceAss istDISTRON IC
or the HOL Dfunc tion isact ivat ed, the vehi-
cle brak esautom atically incer tain situa-
tion s.
To avoid damage tothe vehic le,deact ivate
Ac tiveDist anceAss istDISTRON ICand the
HOL Dfunc tion inthe followin gor similar sit-
uation s:
R when towingthe vehic le
R in the carwash
Deac tivate the HOL Dfunc tion (Ypage 166).
Activa tioncondit ions You
canactivat ethe HOL Dfunc tion if:
R the vehic leisstat ionar y
R the engin eis runn ingorifit has been auto-
matic allyswitc hedoffbythe ECO start/
sto pfunc tion
R the drive r'sdoor isclos edoryour seatbelt
is fast ened
R the elect ricpark ingbrak eis released
R Ac tiveDist anceAss istDISTRON ICisdeact i-
vat ed
R the transm ission isin posit ion005B, 005Eor005C
on vehic leswith autom atictransm ission Driving
systems
165Driving andparking Z