2020 MERCEDES-BENZ GLA SUV brake sensor

Protecting
theenvironment General
notes H
Environmental
note
Daimler's declaredpolicyisone ofcompre-
hensive environm entalprotect ion.
The object ivesareforthe natural resources
that form thebasis ofour existen ceon this
planet tobe used sparingly andinamanner
that takes therequirements ofboth nature
and humanity intoaccount.
You toocan help toprotect theenvironm ent
by operating yourvehicle inan environm en-
tally responsible manner.
Fuel consumpt ionand therate ofengine,
transm ission,brakeandtirewear areaffec-
ted bythese factors:
R operating conditionsof your vehicle
R your personal drivingstyle
You caninfluence bothfactors. Youshould
bear thefollowing inmind:
Operating conditions:
R avoid shorttripsasthese increase fuel
consumpt ion.
R alwa ysmake surethatthetire pressures
are correct .
R do not carry anyunnecessary weight.
R remove roofracks onceyounolonger
need them.
R aregularly servicedvehiclewillcont ribute
to environm entalprotect ion.You should
therefore adheretothe service intervals.
R alwa yshave service workcarried outata
quali fiedspecialist workshop.
Personal drivingstyle:
R do not depress theaccelerator pedal
when startin gthe engine.
R do not warm upthe engine whenthevehi-
cle isstationary.
R drive carefully andmaintain asafe dis-
tance fromthevehicle infront .
R avoid frequent, suddenacceleration and
braking. R
change gearingood timeanduseeach
gear onlyupto00C3 ofits maximum engine
speed.
R switch offthe engine instationary traffic.
R keep aneye onthe vehicle's fuelcon-
sumption. Environmental
concerns andrecom-
mendat ions
Wherever theOperator's Manualrequires you
to dispose ofmaterials, firsttrytoregenerate
or re-use them.Observe therelevant environ-
ment alrules andregulations whendisposing
of materials. Inthis way youwillhelp topro-
tect theenvironm ent. Genuine
Mercedes-Benz parts H
Environmental
note
Daimler AGalso supplie srecondit ioned
major assemblies andparts which areofthe
same qualityas new parts. Theyarecovered
by the same Limited Warranty entitlements
as new parts.
! Air
bags andEmergen cyTensioning Devi-
ces, aswell ascont rolunits andsensors for
these restraint systems, maybeinstalled in
the following areasofyour vehicle:
R doors
R door pillars
R door sills
R seats
R cock pit
R instrumen tcluster
R cent erconsole
Do not install accessories suchasaudio sys-
tems inthese areas. Donot carry out
repairs orwelding. Youcould impair the
operating efficiency ofthe restraint sys-
tems.
Have aftermark etaccessories installedata
quali fiedspecialist workshop.
You could jeopardize theoperating safetyof
your vehicle ifyou useparts, tiresandwheels
as well asaccessories relevanttosafety which Genuine
Mercedes-Benz parts
25Introdu ction Z

Situat
ion-dependent brakingassis-
tance General
informat ion
i Observe
the"Important safetynotes" sec-
tion (Ypage 60).
With thehelp ofthe radar sensor system,
Act ive Brake Assist candetect obstacles that
are inthe path ofyour vehicle foranexten ded
period oftime.
If Act ive Brake Assist detectsa risk ofcollision
with thevehicle infront ,it calculates thebrake
pressure necessary toavoid acollision. Ifyou
apply thebrakes forcefully, <0056004C0057005800440057004C005200510010004700480053004800510047
0010[
ent braking assistance adaptstothe situation
and automatically increasesthebrake pres-
sure toadegree appropriate tothe traffic sit-
uation.
Situation- dependent brakingassistance pro-
vides braking assistance inhazardous situa-
tions atspeeds above4mph (7km/h). Ituses
radar sensor technology toassess thetraffic
situation.
Situation- dependent brakingassistance is
capable ofreacting tomoving objectsthat
have already beendetect edassuch atleast
once overtheperiod ofobservation, upto
vehicle speeds ofaround 155mph
(250 km/h).
Situation- dependent brakingassistance can
also detect stationary objects,up tovehicle
speeds ofaround 44mph (70km/h).
X Keep thebrake pedaldepressed untilthe
emergency brakingsituation isover.
ABS prevent sthe wheels fromlocking.
The brakes willwork normally againif:
R you release thebrake pedal
R there isno longer anydanger ofacollision
R no obstacle isdetect edinfront ofyour vehi-
cle
Situation- dependent brakingassistance isthen
deactivated.
Import antsafety notes
i Observe
the"Important safetynotes" sec-
tion fordriving safetysystems (Ypage 60). G
WARNING
Act ive Brake Assist doesnotreact:
R to persons, bicycles, motorcyclesorani-
mals
R to approaching vehicles
R to cross traffic
R on bends
As aresult, Active Brake Assist cannot inter-
vene inall critical situations. Thereisarisk
of an accident.
Always paycareful attentiontothe traffic
situation andbeprepared tobrake. G
WARNING
Adaptive BrakeAssist cannot alwaysclearly
identify objectsand complex trafficsitua-
tions.
In such cases, Adaptive BrakeAssist might:
R interv eneunnecessarily
R not interv ene
There isarisk ofan accident.
Always paycareful attentiontothe traffic
situation andbeready tobrake. Terminate
the interv ention inanon- critical drivingsit-
uation.
Due tothe nature ofthe system, complex but
non- critical drivingcondition smay alsocause
Act ive Brake Assist tointerv ene.
Even ifAct ive Brake Assist isnot availa bledue
to amalfunction inthe radar sensor system,
the brake system isstill availa blewith full
brake boosting effectandBAS. ESP
®
(Ele ctronic Stability Program)
General notes i
Observe
the"Important safetynotes" sec-
tion (Ypage 60).
ESP ®
monitor sdriving stability andtract ion,
i.e. power transm issionbetween thetires and
the road surface.
If ESP ®
detect sthat thevehicle isdeviating
from thedirection desiredbythe driver, oneor
more wheels arebraked tostabilize thevehi- Driving
safetysystems
63Safety Z

Tail
lamps
X Loosen screws0087using ascrewdriver.
X Remove thebulb holder fromthetaillamp. Bulb
holder
0085 Turn signals
0083 Brake lamp
X Tur nsignal: pressthebulb gently intothe
bulb holder, turnitcount er-clockwise and
remove itfrom thebulb holder.
X Insert thenew bulb intothebulb holder and
turn itclock wise.
X Bra kelamp :remove thecorrespon ding
bulb from thebulb holder.
X Insert thenew bulb intothebulb holder.
X Insert thebulb holder intothetaillamp and
screw itfirmly intoplace usingscrews 0087.
X Insert thetaillamp intothevehicle.
X Tighten fendernut0043and re-est ablish con-
tact with conn ector 0044.
X Close theside trimpanel (Ypage 108). Windshield
wipers Switching
thewindshield wipers
on/off
! Do
not operate thewindshield wipers
when thewindshield isdry, asthis could
damage thewiper blades. Moreover, dust
that hascollected onthe windshield can
scratc hthe glass ifwiping takesplacewhen
the windshield isdry.
If it is necessary toswitch onthe windshield
wipers indry weather conditions,alway suse
washer fluidwhen operating thewindshield
wipers.
! If
the windshield wipersleavesmears on
the windshield afterthevehicle hasbeen
washed inan automatic carwash, waxor
other residues maybethe reason forthis.
Clean thewindshield usingwasher fluid
after washing thevehicle inan automatic
car wash. Combination
switch
0047 003F Windshield wiperoff
0048 0062 Intermitt entwipe, low(rain sensor
set tolow sensitivit y)
0049 0063 Intermitt entwipe, high(rain sensor
set tohigh sensitivit y)
004A 00AA Continuous wipe,slow
004B 00A9 Continuous wipe,fast
0084 00D3 Single wipe/00D4 Wipesthewind-
shield usingwasher fluid
X Switch onthe ignition.
X Turn thecombinat ionswitch tothe corre-
sponding position.
! Vehicles
witharain sensor: ifthe wind-
shield becomes dirtyindry weather condi-
tions, thewindshield wipersmaybeactiva-
ted inadverten tly.This could thendamage Windshield
wipers
109Lightsandwindshield wipers 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

!
When
Active Distance AssistDISTRONIC
or the HOLD function isactivated, thevehi-
cle brakes automaticall yin certain situa-
tions.
To avoid damage tothe vehicle, deactivate
Act ive Distance AssistDISTRONIC andthe
HOLD function inthe followi ngorsimila rsit-
uations:
R when towing thevehicle
R in the carwash
Act ive Distance AssistDISTRONIC canneither
reduce therisk ofan accident ifyou failto
adap tyour driving style,noroverride thelaws
of physics. Active Distance AssistDISTRONIC
cannot takeintoaccount road,weather ortraf-
fic conditions. Active Distance Assist
DISTRONIC isonly anaid. You areresponsible
for the distance tothe vehicle infront ,for
vehicle speed,forbraking ingood timeandfor
staying inyour lane.
Do not use Active Distance AssistDISTRONIC:
R In road andtraffic conditions whichdonot
allow youtomaintain aconst antspeed, e.g.
in heavy traffic oron winding roads
R On slippe ryroad surfaces. Brakingoraccel-
erating couldcause thedrive wheels tolose
traction andthevehicle couldthenskid
R In poor visibil ity,e.g. due tofog, heavy rain
or snow
Act ive Distance AssistDISTRONIC maynot
detect narrow vehicles drivinginfront ,e.g.
motorcycles, orvehicles drivinginastaggered
formation.
In particular, thedetection ofobstacles canbe
impaired if:
R There isdirt onthe sensors oranything else
covering thesensors
R There issnow orheavy rain
R There isinterferenc eby other radarsources
R There arestrong radarreflections, forexam-
ple inparking garages
If Act ive Distance AssistDISTRONIC nolonger
detects avehicle infront ,Distance Pilot
DISTRONIC mayunexpectedly accelerateto
the speed stored. This
speed may:
R Be too high ifyou aredriving inaturning
lane oran exit lane
R Be sohigh when driving inthe right-hand
lane thatyouovertake vehiclesinthe left-
hand lane
R Be sohigh inthe left lane thatyoupass
vehicles drivingonthe right
If there isachange ofdrivers, advisethenew
driver ofthe speed stored.
Cruise control lever 0043
Tostore thecurrent speedorahigher
speed
0044 Tostore thecurrent speedoralower
speed
0087 Todeactivate Active Distance Assist
DISTRONIC
0085 Tostore thecurrent speedorcalls upthe
last stored speed
0083 Toset aspecified minimum distance
Activating ActiveDistance Assist
DISTRONIC Activation
conditions
! When
Active Distance AssistDISTRONIC
or the HOLD function isactivated, thevehi-
cle brakes automaticall yin certain situa-
tions.
To avoid damage tothe vehicle, deactivate
Act ive Distance AssistDISTRONIC andthe
HOLD function inthe followi ngorsimila rsit-
uations:
R when towing thevehicle
R in the carwash 160
Driving
systemsDriving andparking

object
swhen theyareinthe immediate
vicinit yof the vehicle. Youcould damage the
vehicle orthe object s.
The sensors maynotdetect snowandother
object sthat absorb ultrasonic waves.
Ultrasonic sourcessuchasan automatic car
wash, thecompressed- airbrakes ofatruck
or apneumatic drillcould cause Parking
Assist PARKTRONIC tomalfunct ion.
Parking AssistPARKTRONIC maynotfunc-
tion correc tlyon uneven terrain.
Parking AssistPARKTRONIC isactivated auto-
matically whenyou:
R switch onthe ignition
R shift thetransm issiontoposition 005B,005Eor
005C
Parking AssistPARKTRONIC isdeactivated at
speeds above11mph (18km/ h).It is rea cti-
vate dat lowe rspe eds.
Rang eof the senso rs Gen
eral notes
Pa rking AssistPAR KTRONIC doesnot take into
acco untobstacl eslocate d:
R bel ow the dete ction range,such asper sons ,
ani mal sor obje cts
R ab ove thedete ction range,e.g. overhanging
lo ad s,tai lsecti onsorload ing ram psof
trucks 0043
Senso rsinthe front bumpe r,left-ha ndside
(e xamp le)
The sens orsmus tbe free from dirt, ice or
slu sh. The ycan othe rwisenot functi oncor-
rectl y.Clea nthe sens orsregularl y,taki ngcare
not toscra tchordamag ethem (Ypage 283 ). Rang
e 0043
Detecti onrang eof front sensors
0044 Detecti onrang eof rea rsens ors
Front sensors Ce
nter Appr
ox.40in(app rox.
100 cm) Co
rners Appr
ox.24in(app rox.
60 cm) Re
ar sens ors Ce
nter Appr
ox.48in(app rox.
120 cm) Co
rners Appr
ox.32in(app rox.
80 cm) Mini
mum distance Ce
nter Appr
ox.8in (app rox.
20 cm) Co
rners Appr
ox.6in (app rox.
15 cm) If
an obs tacl eis dete cted within thisrang e,the
rel eva ntwa rning displ ayslight upand awa rn-
ing tone sounds. Ifthe distance fallsbel ow the
mini mum ,the distance maynolonger be
sho wn. 17
2 Dri
ving sys temsDriving and parkin g

Problems
withParking AssistPARKTRONIC Problem
Possible
causes/co nsequences and0050 0050
Solutions Only
thered segments
in the Parking Assist
PARKTRONIC warning
display sare lit.You also
hear awarning tonefor
approximately twosec-
onds.
Parking Assist
PARKTRONIC isthen
deactivated andthe
indicator lamponthe
PARKTRONIC button
lights up. Parking
AssistPARKTRONIC hasmalfunction edand hasbeen deac-
tivated.
X Ifproblems persist,haveParking AssistPARKTRONIC checkedat
a quali fiedspecialist workshop. Only
thered segments
in the Parking Assist
PARKTRONIC warning
display sare lit.Parking
Assist PARKTRONIC is
then deactivated. The
Parking AssistPARKTRONIC sensorsaredirty orthere isinter-
ferenc e.
X Clean theParking AssistPARKTRONIC sensors(Ypage 283).
X Switch theignition backon. The
problem maybecaused byan extern alsource ofradio orultra-
sound waves.
X Check tosee ifParking AssistPARKTRONIC worksatadifferent
location. Active
Parking Assist
General notes Act
ive Parking Assistisan electron icparking
aid with ultrasound. Itmeasures theroad on
both sides ofthe vehicle. Aparking symbol
indicates asuitable parkingspace.Active
steering intervention andbrake application
can assist youduring parking andwhen exiting
a parking space.Youcanalso stilluse Parking
Assist PARKTRONIC (Ypage 171).
Import antsafety notes Act
ive Parking Assistismerely anaid. Itis not
a replacement foryour atten tiontoyour imme-
diate surroundings. Youarealwa ysresponsi-
ble forsafe maneuvering, parkingandexiting a
parking space.Makesurethatthere areno
persons, animalsorobject sin the maneuver-
ing area when youaremaneuvering orparking.
When Parking AssistPARKTRONIC isdeactiva-
ted, Active Parking Assistisalso unavaila ble. G
WARNING
While parking orpulli ngout ofaparking
space, thevehicle swingsoutand candrive
onto areas ofthe oncomin glane. Thiscould
cause youtocollide withother roadusers or
object s.There isarisk ofan accident.
Pay atten tiontoother roadusers orobject s.
Stop thevehicle ifnecessary orcancel the
Act ive Parking Assistparking procedure.
! If
they cannot beavoided, driveover
obstacles suchascurbs slowly andatan
obtuse angle.Otherwise, youmay damage
the wheels ortires.
Act ive Parking Assistmaypossibly indicate
parking spaceswhicharenot suitable forpark-
ing, forexample:
R where parking orstopping isprohibited
R in front ofdriveways orentr ances andexits
R on unsuitable surfaces 174
Driving
systemsDriving andparking

Disp
laymes sages Poss
iblecauses/co nsequences and 0050 0050
Solu tions Act
ive Brake Act
ive Brake
Ass ist Functions Ass
ist Functions
Cur rently Limite d Cur
rently Limite d
See Operator'sMan ‐ See
Operator'sMan ‐
ual ual Ac
tive Brake Assis tis tempo rarily ino per ative.
Pos siblecaus esare:
R theradar sensor syst emistempo rarily ino per ative, e.g. due to
elec tromag netic radi ation emi tted bynearby TVorradi ostati ons
or other sour cesof elec tromag netic radi ation
R thesyst emisout side theoper ating tempe rature range
R theon -boar dvol tag eis toolow
Whe nth ecaus esstate dabov eno longer apply, thedisp laymes sage
disap pears.
Ac tive Brake Assis tis oper ationalagain .
If th edisp laymes sage does notdisap pear:
X Pull overand stop theveh iclesaf ely assoo nas pos sible,payin g
att ention toroa dand traff icco nd ition s.
X Se cur eth eveh icleagain strol lingaway (Ypage 145).
X Rest arttheen gin e. Act
ive Brake Act
ive Brake
Ass ist:Sys tem Ass
ist:Sys tem
Ino perative Ino
perative Ac
tive Brake Assis tis unav ailable duetoamalf unction .Sit uati on-
depe ndentbrak ingassi stanc emay alsohavefail ed.
X Vis itaqualif iedspecialistwor kshop immediat ely. Rad
arSensors Rad
arSensors
Dir tySee Opera‐ Dir
tySee Opera‐
tor 'sManual tor
'sManual The
radar sensor syst emismalf unction ing .
Pos siblecaus esare:
R dir ton sen sors
R heav yrain orsnow
R when drivin gon inter- urban roadswithout traff icor infras truct ure,
e. g. indes ert-like area s
At least onedri vin gsyst emordrivin gsaf etysyst emismalf unction -
ing oristempo rarilyunav ailable :
R Ac tive Brake Assis t
R Ac tive Distanc eAs sis tDI ST RONI C
A warn ingtone also soun ds.
On ce thecaus eof thepro blem isno longer presen t,th edri vin gand
dri ve saf etysyst ems willbeavail able again .The displaymes sage
disap pears.
If th edisp laymes sage does notdisap pear:
X Pull overand stop theveh iclesaf ely assoo nas pos sible,payin g
att ention toroa dand traff icco nd ition s.
X Se cur eth eveh icleagain strol lingaway (Ypage 145).
X Swi tchoff theen gin e.
X Clean allsen sors(Y page 283).
X Rest arttheen gin e.
The displaymes sage disap pears. Disp
laymes sage s
211On -boar dcomp uter anddi sp lay s Z