tow MERCEDES-BENZ A-CLASS HATCHBACK 2021 Owners Manual

Changing bulbs (only
forve hicles with hal-
ogen headlamps) ......................................... 143
Wi ndsc reen wipers and windscreen
wa sher system ............................................ 145
Mir rors ........................................................ 149 Climat
Climat
e contr
e control ol........................................... 153 153
Overview of climate control systems ............ 153
Operating the climate control system .......... 154 Dr
Dr
iving and par
iving and par king
king..................................... 162 162
Driving ........................................................1 62
DY NAMIC SELECT switch ........................... .178
Manual transmission ................................... 181
Au tomatic transmission .............................. .183
Fu nction of the 4MATIC ...............................1 87
Re fuelling .................................................... 188
Charging the high-voltage battery (plug-in
hy brid) ........................................................ 194
Pa rking .......................................................2 11
Driving and driving saf ety sy stems ............... 219
Tr ailer hitch ................................................ .270
Bicycle rack function ................................... 274
Ve hicle towing instructions .......................... 276 Ins
Ins
tr
trument displa
ument displa y and on-boar
y and on-boar d com-
d com-
put
put er
er........................................................... 277 277
No tes on the inst rument display and on-
board computer .......................................... 277
Overview of instrument display .................... 278
Overview of buttons on the steering wheel ... 279
Operating the on-board computer ................2 79
Fu nction of the po wer me ter (plug-in
hy brid) ........................................................ 281
Fu nction of the electric mo tor po wer
av ailability displ ay(plug-in hybrid) ................ 281
Displaying the po wer me ter (plug-in
hy brid) ........................................................ 282
Overview of displa ysinthe inst rument
display ........................................................ 282
Head-up display .......................................... 282 MBUX multimedia syst MBUX multimedia syst
em
em........................... .285
285
Overview and operation ............................... 285
System settings .......................................... 294
Plug-in hybrid settings ................................ .298
Na vigation .................................................. .299
Te lephone ................................................... 308
Mercedes me app ....................................... 311 Mercedes-Benz emer
gency call system ....... 320
Ra dio & media ............................................ .324
Sound settings ............................................ 329 Maint Maint
enance and car
enance and car e
e................................. 330 330
ASS YST PLUS service inter val display .......... 330
Engine compartment ................................... 331
Cleaning and care ....................................... 337 Br Br
eakdo
eakdo wn assist
wn assist ance
ance................................. 346 346
Emer gency .................................................. 346
Flat tyre ...................................................... 348
Battery (vehicle) .......................................... 354
To w- starting or towing away ........................ 358
Electrical fuses ............................................ 364 Wheels and tyr Wheels and tyr
es
es......................................... 368 368
No tes on noise or unusual handling char-
acteristics ................................................... 368
No tes on regula rly inspecting wheels and
tyres .......................................................... .368
No tes on snow chains ................................. 368
Ty re pressure .............................................. 369 Contents
3 3

1
Steering wheel gearshiT paddles →
185
2 Combination switch →
136
3 Instrument displ ay →
278
4 DIRECT SELECT le ver →
183
5 ü Start/stop but ton →
166
è ECO start/s top function →
173
6 Media display →
285
7 Climate control systems →
154
8 £ Hazard warning light system →
137
9 PASSENGER AIR BAG indicator la mps→
57
A Glovecompartment →
119
B Stow age compartment →
119
C Cup holder
D 8 Controller forvo lume and switching
sound on/o. →
285
Ü Switches the MBUX multimedia system
on/o. →
285 E
z Calls up navigation →
287
F | Calls up radio or media →
287
G % Calls up thete lephone →
287
H ß Calls up favo urites →
287
I y Calls up vehicle functions →
287
J c Active Parking Assist →
266
K DYNAMIC SELECT switch →
179
L Touchpad →
287
M Control panel forth e MBUX multimedia system →
279
N Adjusts the steering wheel →
112
O ý Switches the steering wheel heater
on/o. →
113
P Control panel:
On-board computer →
279
Cruise control or variable limi ter →
230
I Active Distance Assist DISTRONIC →
234
Q Diagnostics connection →
39 At
a glance – Cockpit
7
7

1
Safetyve sts →
346
2 Fire extinguisher →
347
3 ; me button →
311
G SOS button →
311
4 £ Hazard warning light system →
137
5 Stow age compartment for customer literature
6 Starting assis tance →
357
7 Tocheck and top up operating 0uids →
393
8 Tow- starting or towing away →
360
9 Flat tyre →
348 A
B-pillar with:
QR code for accessing there scue card →
42
B Tow- starting or towing away →
360
C Warning triangle →
346
D TIREFIT kit →
350
E Firs t-aid kit (soT sided) →
347
F Fuel /ller 0ap with:
information label on fuel type →
188
information label on tyre pressure →
370
QR code for accessing there scue card →
42 At
a glance – Emer gencies and breakdowns
21 21

Calling up t
Calling up t
he Digit
he Digital Owner's Manual
al Owner's Manual
Multimedia system: 4 © 5
Info 5
Owner's Manual 5
Õ The Digital Owner's Manual describes
the func-
tions and operation of theve hicle and the multi-
media system. #
Select one of thefo llowing menu items in the
Digital Owner's Manual:
R Search: sear chforke ywords in order to/nd
qu ick answers toquestions about the opera-
tion of theve hicle.
R Quick start: here is where you /nd the /rst
steps towa rds setting up your vehicle. R
Tips: /nd information that prepares youfor
cer tain eve ryday situations with your vehicle.
R Animations :wa tch animations of theve hicle
functions.
R Messages: receive additional information
about the messages in the Instrument Displa y.
R Bookmarks :ga in access toyour personally
sa ved bookmar ks.
R Language: select the language forth e Digital
Owner's Manual. 1
Back
2 Adds bookmar ks
3 Pictu re 4
Contents section
5 Directions of mo vement of contents section
6 Menu
Some sections in the Digital Owner's Manual,
such as warning no tes, can be expanded and col-
lapsed.
A A dditional met
dditional met hods of calling up t
hods of calling up t he Digit
he Digital Own-
al Own-
er's Manual:
er's Manual:
Dir Dir ect access:
ect access: openthere qu ired content in the
Digital Owner's Manual bypressing and holding
an entry on theta b bar in the multimedia system: Ins
Instr
trument Display
ument Display :
:call up brief information as
display messages in the inst rument clus ter 22
22
Digital Owner's Manual

Diagnos
Diagnos
tics connection
tics connection
The diagnostics connection is a tech nical inter-
fa ce in theve hicle. It is used, forex ample, in the
cont ext of repair and maintenance workor for
re ading out vehicle data in a specialist workshop.
Diagnostic devices should therefore only be con-
nected in a quali/ed specialist workshop. &
W
WARNING
ARNING Risk of accident due tocon-
necting devices tothe diagnostics con-
nection
If yo u connect devices tothe diagnostics con-
nection of theve hicle, the function of vehicle
systems and operating saf ety may be
impaired. #
For saf etyre asons, werecommend that
yo u only use and connect products
appr ovedby yo ur Mercedes-Benz service
centre. &
W
WARNING
ARNING Risk of accident due toobjects
in the driver's foot we ll
Objects in the driver's foot we ll may impede
pedal tr avel or block a depressed pedal.
This jeopardises the operating and road saf ety
of theve hicle. #
Stow all objects in theve hicle securely
so that they cannot getinto the driver's
fo ot we ll. #
Always /t the 0oor mats securely and as
prescribed in order toensure that there
is alw ays su1cient room forth e pedals. #
Do not use loose 0oor mats and do not
place 0oor mats on top of one ano ther. *
N NOOTE
TE Battery discharging from using devi-
ces connected tothe diagnostics connec-
tion Using devices at
the diagnostics connection
drains the batter y. #
Check thech arge leve l of the batter y. #
Ifth ech arge leve l is lo w,charge the bat-
te ry, e.g. bydriving a considerable dis-
ta nce. Please also no
tethe information about the 12 V
battery and short-dis tance trips in the "Driving
and Parking" chap ter (/ page 169). General no
tes
39
39

R
R
es
estr traint syst
aint syst em
em Pr
ot
Pr otection pro
ection pro vided b
vided by t
y the r
he r es
estr traint syst
aint syst em
em The
restraint system includes thefo llowing com-
ponents:
R Seat belt system
R Airbags
R Child restraint system
R Child seat secu ring systems
The restraint system can help pr eventtheve hicle
occupants from coming into contact with parts of
th eve hicle interior in theev ent of an accident. In
th eev ent of an accident, there straint system can
also reduce thefo rc es towhich theve hicle occu-
pants are subjected.
A seat belt can only pr ovide the best le vel of pro-
te ction if it is worncor rectl y.Depending on the
de tected accident situation, seat belt tensioners
and/or airbags supplement the pr otection o.ered
by a cor rectly wornseat belt. Seat belt tensioners
and/or airbags are not deplo yed in every acci-
dent. In order
forth ere straint system toprov ide the
intended le vel of pr otection, each vehicle occu-
pant must obser vethefo llowing information:
R Fasten seat belts co rrectl y.
R Sit in an almost up right seat position with their
back against the seat backrest.
R Sit with their feet resting on the 0oor, if possi-
ble.
R Always secure persons under 1.50 m tall in an
additional restraint system suitable for
Mercedes-Benz vehicles.
Ho wever,no system available today can com-
ple tely eliminate injuries and fatalities in every
accident situation. In particular, the seat belt and
airbag generally do not pr otect against objects
penetrating theve hicle from the outside. It is also
not possible tocomple tely rule out therisk of
injury caused bythe airbag deploying. Limit Limit
ations of t
ations of t he prot
he pr otection pro
ection pro vided b
vided by t
y the
he
r
r es
estr traint syst
aint syst em
em &
W
WARNING
ARNING Risk of injury or death due to
modi/cations tothere straint system
Ve hicle occupants may no lon ger be pr otected
as intended if alterations are made tothe
re straint system. #
Never alter the parts of there straint sys-
te m. #
Neverta mp er with the wiring or any elec-
tronic component parts or their soT-
wa re. If it is necessary
tomodify theve hicle toaccom-
modate a person with disabilities, contact a quali-
/ed specialist workshop.
Mercedes-Benz recommends that you use driving
aids which ha vebeen appr ovedfo ryo ur vehicle by
Mercedes-Benz. 46
46
Occupant sa
fety

not high. Con
versely, an airbag may be depl oyed
ev en though theve hicle su.ers only minor defor-
mation. If very rigid vehicle parts such as longitu-
dinal membe rsare hit, this may result in su1-
ciently high le vels of vehicle deceleration.
Depending on the de tected deployment situation,
th e components of there straint system can be
acti vated or deplo yed independently of each
ot her:
R Seat belt tensioner: frontal impact, rear
impact, side impact, rollo ver 1
R Driver's airbag, front passenger airbag: frontal
impact
R Knee airbag: frontal impact
R Side airbag: side impact
R Window airbag: side impact, rollo ver 1
, frontal
impact
1) Only for cer tain countries.
The front passenger airbag can only be deplo yed
in an accident if thePA SSENGER AIR BAG OFF
indicator la mpis o.. If the front passenger seat is
occupied, make sure, bo thbefore and during thejourne
y,that the status of the front passenger air-
bag is cor rect (/ page 57). &
W
WARNING
ARNING Risk of burns from hot airbag
components
The airbag parts are hot aTer an airbag has
been deplo yed. #
Do not touch the airbag parts. #
Have a depl oyed airbag replaced at a
qu ali/ed specialist workshop as soon as
possible. Mercedes-Benz
recommends that you ha vethe
ve hicle towe dto aqu ali/ed specialist workshop
aTer an accident. Take this into account, particu-
lar lyif a seat belt tensioner is triggered or an air-
bag deplo yed.
If th e seat belt tensioners are triggered or an air-
bag is deplo yed, you will hear a bang, and a small
amount of powder may also be released:
R The bang will not generally a.ect your hearing.
R Ingeneral, the powder released is not hazard-
ous tohealth but may cause short- term breathing di1culties
topersons su.ering from
asthma or other pulmonary conditions.
Pr ov ided it is safe todo so, lea vetheve hicle
immediately or open the window in order to
pr ev ent breathing di1culties. Seat belts
Seat belts
Pr
ot
Pr otection pro
ection pro vided b
vided by t
y the seat belt
he seat belt Alw
aysfa sten your seat belt cor rectly before
starting a journe y.A seat belt can only pr ovide
th e best le vel of pr otection if it is worncor rectl y. &
W
WARNI NG
ARNI NGRisk of injury or dea thdue to
incor rectly fastened seat belt
If th e seat belt is not worncor rectl y,it cannot
per form its intended pr otective function.
In addition, an incor rectly fastened seat belt
can also cause injuries, forex ample, in the
ev ent of an accident or when braking or
ch anging direction suddenl y.48
48
Occupant saf
ety

re
placed at a quali/ed specialist work-
shop. Mercedes-Benz
recommends that you ha vethe
ve hicle towe dto aqu ali/ed specialist workshop
aTer an accident.
* N
NO OTE
TE Damage caused bytrapping the
seat belt If an unused seat belt is not fully
retracted, it
may become trapped in the door or in the seat
mechanism. #
Always ensu rethat an unused seat belt
is fully retracted. F
F
ast
ast ening seat belts
ening seat belts If
th e seat belt is pulled quickly or sharpl y,the
seat belt retractor loc ks. The seat belt strap can-
not be pulled out any fur ther. #
Always engage seat belt tongue 2ofthe seat
belt into seat belt buckle 1ofthe cor re-
sponding seat.
% A seat belt can only pr ovide the best le vel of
pr otection if it is worncor rectl y.Obser vethe
no tes on fastening the seat belt (/ page 48).*
N
NOOTE
TE Deployment of components of the
re straint system when the front passenger
seat is unoccupied and a seat belt is
buckled When
the front passenger seat is unoccupied
and the seat belt tongue of the seat belt is
engaged in the seat belt buckle, components
of there straint system ma y deployunnecessa-
ri ly on the front passenger side, e.g. the seat
belt tensioner. #
Only buckle the seat belts as intended. %
Obser vethe no tes on st owage areas
(/ page 116).
Information on /tting a child restraint system
and on children tr avelling in theve hicle can
be found in the "Children in theve hicle" sec-
tion (/ page 66). Seat belt adjus Seat belt adjustment function
tment function V
V
ehicles wit
ehicles wit h PRE-S
h PRE-SAFE
AFE®
®
:
:aTer a front seat belt
has been fastened, the automatic seat belt adjust- Occupant saf
ety
51
51

R
The seat belt tongue is engaged in the seat
belt buckle of the front passenger seat and
th e front passenger seat is unoccupied. #
Stow objects in a suitable place. #
Only one person should use each seat
belt at any one time. Depending on
the de tected accident situation, the
wind owairbag on the front passenger side may
deplo y.The airbag is deplo yedre ga rdless of
whe ther the front passenger seat is occupied. Pr
ot
Pr otection pro
ection pro vided b
vided b y t
y the airbags
he airbags Depending on
the accident situation, an airbag
may supplement the pr otection o.ered bya cor-
re ctly fastened seat belt. &
W
WARNING
ARNING Risk of injur y or death due to
an inco rrect seat position
If yo u deviate from the cor rect seat position,
th e airbag cannot per form its intended pr otec-
tive function. Each
vehicle occupant must make sure of the
fo llowing:
R Fasten seat belts co rrectl y.Pregnant
wo men must take particular care toensure
th at the lap belt ne ver lies across the
abdomen.
R Adopt the cor rect seat position and keep
as farawa y as possible from the airbags.
R Obser vethefo llowing information. #
Always make sure that there are no
objects between the airbag and vehicle
occupant. To
avo idtherisks resulting from the deployment
of an airbag, each vehicle occupant must obser ve
th efo llowing information in particular:
R Before starting your journe y,adjust your seat
cor rectl y;the driver's seat and front
passenger seat should be mo ved as far back
as possible.
When doing so, alw ays obser vethe informa-
tion on the cor rect driver's seat position
(/ page 102). R
Only hold the steering wheel bythe steering
wheel rim. This allo ws the airbag tobe fully
deplo yed.
R Always lean against the seat backrest when
th eve hicle is in motion. Do not lean forw ards
or against the door or side windo w.You may
ot herwise be in the deployment area of the
airbags.
R The occupants must alw ayske ep their feet on
th e 0oor. Do not put your feet on the cockpit,
fo rex ample. Your feet may otherwise be in the
deployment area of the airbag.
R Ifch ildren are tr avelling in theve hicle, obser ve
th e additional no tes (/ page 62).
R Always st owand secure objects cor rectl y.
Objects in theve hicle interior may pr event an air-
bag from functioning cor rectl y.Each vehicle occu-
pant must alw ays make sure of thefo llowing in
particular:
R There are no people, animals or objects
between theve hicle occupants and an airbag.
R There are no objects between the seat, door
and door pillar (B-pillar). 54 54
Occupant saf
ety

&
W
WARNI NG
ARNI NGRisk of injury due tomalfunc-
tioning sensors in the door
The function of the airbags can be impaired
due tomodi/cations or incor rect wo rkper-
fo rm ed on the doors or door trim, or if the
doors are damaged. #
Never modify the doors or parts of the
doors. #
Always ha veworkon the doors or door
trim car ried out at a quali/ed specialist
wo rkshop. &
W
WARNING
ARNING Risk of injury due todeplo yed
airbag
A depl oyed airbag no longer o.ers any pr otec-
tion. #
Have theve hicle towe dto a quali/ed
specialist workshop in order tohave the
deplo yed airbag replaced. Ha
ve deplo yed airbags replaced immediatel y. S
S
t
tatus of t
atus of t he fr
he front passeng
ont passeng er fr
er front airbag
ont airbag F
F
unction of t
unction of t he aut
he automatic fr
omatic fr ont passeng
ont passeng er airbag
er airbag
shut
shut o.
o.
The automatic front passen ger airbag shuto. is
able todetect whe ther the front passenger seat is
occupied bya person or a child restraint system.
The front passenger airbag is enabled or disabled
acco rdingl y. &
W WARNI NG
ARNI NGRisk of injury or dea thdue to
objects under the co-driver seat
Objects trapped under the co-driver seat can
inter fere with the function of the automatic
co-driver airbag shuto. or damage the system. #
Do not store any objects under the co-
driver seat. #
When the co-driver seat is occupied,
make sure that no objects are trapped
under the co-driver seat. When /tting a
child restraint system tothe front
passenger seat, obser vetheve hicle-speci/c infor-
mation (/ page 77). Also, alw ays obser vethe
no tes on rear wa rd-facing or forw ard-facing child re
straint systems on the front passenger seat
(/ page 76).
A person on the front passenger seat must
obser vethefo llowing information:
R Fasten seat belts co rrectly (/ page 48).
R Sit in an almost upright seat position with their
back against the seat backrest.
R Sit with their feet resting on the 0oor, if possi-
ble.
The front passenger airbag may otherwise be dis-
abled bymistake, forex ample, in thefo llowing sit-
uations:
R The front passenger transfers their weight by
supporting themsel ves on a vehicle armrest.
R The front passen ger sits in such a wayth at
th eir weight is raised from the seat sur face. &
W
WARNING
ARNING Risk of injury or death due to a
disabled front passenger airbag
The front passenger airbag is disabled when
th ePA SSENGER AIR BAG OFF indicator la mp
is lit. 56 56
Occupant saf
ety