belt MERCEDES-BENZ A-CLASS HATCHBACK 2021 Owners Manual

Symbols
Symbols
.......................................................... 5 5A
A
t a glance
t a glance ...................................................... 6 6
Co ckpit ........................................................... 6
Cockpit (Plug-in-Hybrid) ................................ .10
Indicator and warning lamps (standard) ......... 12
Indicator and warning lamps (widescreen
cockpit) ........................................................ 14
Overhead control panel ................................. 16
Door operating unit and seat adjustment .......18
Emer gencies and breakdowns ....................... 20 Digit Digit
al Owner's Manual
al Owner's Manual ................................. 22 22
Calling up the Digital Owner's Manual ............ 22 Gener
Gener
al not
al notes
es............................................... 24 24
Pr otection of the environment ....................... 24
Ta ke -back of end-of-life vehicles .................... 24
Mercedes-Benz Genuine Parts ........................ 25
Owner's Manual ............................................ 26
Mercedes me App ......................................... 26
Operating saf ety ............................................ 27 Declarations of con
form ity and no tes on
driving in di.erent countries .......................... 29
Diagnostics connection ................................. 39
Quali/ed specialist workshop ........................ 40
Ve hicle registration ....................................... 40
Cor rect use of theve hicle ............................. 40
Information on the REACH regulation ............. 41
No tesfo r persons with electronic medical
aids .............................................................. 41
Implied warranty .......................................... .42
QR code forre scue card .............................. .42
Data storage .................................................42
Copyright ...................................................... 45 Occupant safe Occupant safe
ty
ty ............................................ 46 46
Re straint system .......................................... .46
Seat belts .................................................... .48
Airbags ......................................................... 53
PRE-SAFE ®
system ........................................ 60
Au tomatic measures aTer an accident ........... 61
Safely transporting children in theve hicle ...... 61
No tes on pets in theve hicle .......................... 80 Opening and closing
Opening and closing
...................................... 82 82
Ke y .............................................................. .82
Doors ............................................................ 86
Load compartment ........................................ 90
Side windo ws................................................ 92
Sliding sunroof .............................................. 95
Anti-theT pr otection ...................................... 99 Seats and sto Seats and sto
wing
wing....................................... 102 102
No tes on the cor rect driver's seat position .. 102
Seats ......................................................... .103
St eering wheel ............................................ 112
Easy entry and exitfeature .......................... 113
Memory function ......................................... 114
St ow age areas ............................................ 116
Soc kets ....................................................... 128
Wi reless charging of the mobile phone
and connection with theex terior aerial ........ 130
Fi tting/removing the 0oor mats ................... 132 Light and sight
Light and sight
............................................ 134 134
Exterior lighting ........................................... 134
Interior lighting ............................................ 142 2
2
Contents

1
! ABS →
488
2 #! Turn signal lights →
136
3 h Tyre pressure monitoring system →
490
4 # Electrical fault →
481
5 L Distance warning →
487
6 J Brakes (yellow) →
485
7 J Brakes (red) →
485
8 ! Electric parking brake (yellow) →
485
9 ! Electric parking brake (red) →
485
A % Diesel engine: preglow
B ; Engine diagnostics →
481
C R Rear fog light →
135 D
K High beam →
136
L Low beam →
134
T Standing lights →
134
E å ESP®
OFF →
488
÷ ESP®
→
488
F 6 Restraint system →
477
G Fuel le vel →
278
H æ Reser vefuel wi thfuel /ller 0ap location
indicator →
481
I Ù Powe r steering →
480
J ü Seat belt →
477
K ï Trailer hitch →
480 At
a glance – Indicator and warning lamps (standard)
13
13

1
#! Turn signal lights →
136
2 ï Trailer hitch →
480
3 6 Restraint system →
477
4 å ESP®
OFF →
488
÷ ESP®
→
488
5 R Rear fog light →
135
6 K High beam →
136
L Low beam →
134
T Standing lights →
134
7 ÿ Coolant temp erature →
481
8 Coolant temp erature display →
278
9 ! Electric parking brake (yellow) →
485
A J Brakes (yellow) →
485
B # Electrical fault →
481 C
L Distance warning →
487
D ! ABS →
488
E Ù Powe r steering →
480
F h Tyre pressure monitoring system →
490
G % Diesel engine: preglow
H æ Reser vefuel wi thfuel /ller 0ap location
indicator →
481
I Fuel le vel →
278
J ! Electric parking brake (red) →
485
K ü Seat belt →
477
L J Brakes (red) →
485
M ; Engine diagnostics →
481
N ä Indicator lamp inoperative At
a glance – Indicator and warning lamps (widescreen cockpit)
15
15

Fo
r fur ther information about there cycling and
disposal of end-of-life vehicles, and theta ke -back
conditions, please visit the national
Mercedes-Benz website foryo ur countr y. Mer
Mer
cedes-Benz GenuineP
cedes-Benz GenuineP ar
arts
ts
+ ENVIR
ENVIR ONMENT
ONMENT AL NO
AL NOTE
TEEnvironmental
damage caused bynot using recycled
re conditioned components Mercedes‑Benz
AGo.ers recycled recondi-
tioned components and parts with the same
qu ality as new parts. The same entitlement
from the implied warranty is valid as for new
parts. #
Recycled reconditioned components and
parts from Mercedes‑Benz AG. *
N
NO
OTE
TE Impai rment of the operating e1-
ciency of there straint systems from
installing accessor y parts or fromrepairs
or we lding Airbags and seat belt
tensioners, as well as
control units and sensors forth ere straint sys-
te ms, may be ins talled in thefo llowing areas
of your vehicle:
R Doors
R Door pillars
R Door sills
R Seats
R Cockpit
R Instrument clus ter
R Centre console
R Lateral roof frame #
Do not ins tall accessory parts such as
audio systems in these areas. #
Do not car ryout repairs or welding. #
Have accessory parts retro/tted at a
qu ali/ed specialist workshop. Yo
u could jeopardise the operating saf ety of your
ve hicle if you use parts, tyres and wheels as well
as accessories releva nt tosaf ety which ha venot
been app rove dby Mercedes-Benz. Saf ety-re leva nt
systems, e.g. the brake system, may malfunction.
Only use Mercedes-Benz GenuineParts or parts of
equal qualit y.Only use tyres, wheels and acces-
sory parts that ha vebeen speci/cally appr oved
fo ryo ur vehicle model.
Mercedes-Benz tests original pa rts and con ver-
sion parts and accessory parts that ha vebeen
speci/cally appr ovedfo ryo ur vehicle model for
th eir reliability, saf ety and suitability. Despite
ongoing mar ketre sear ch, Mercedes-Benz is
unable toassess other parts. Mercedes-Benz
th erefore accepts no responsibility forth e use of
such parts in Mercedes-Benz vehicles, even if
th ey have been o1cially appr oved or independ-
ently appr ovedby ate sting centre.
Ce rtain parts are only o1cial lyappr ovedfor
installation or modi/cation if they comply with
legal requ irements. All Mercedes-Benz Genuine-
Pa rts meet the appr oval requ irements. The use of
non-appr oved parts may in validate theve hicle's
ge neral ope rating permit. General no
tes
25 25

Go
vernmental entities are themsel ves, in individ-
ual cases and within the applicable legal frame-
wo rk, authorised toread out data from theve hi-
cle. In the case of an accident, information that
can help with an in vesti gation can, therefore, be
ta ke n from the airbag control unit, forex ample.
Oper
Oper ational dat
ational dat a in t
a in the v
he vehicle
ehicle
This is data rega rding the operation of theve hicle,
which ha vebeen processed bycont rol units.
This includes thefo llowing data, forex ample:
R vehicle status information such as the speed,
longitudinal acceleration, lateral acceleration,
number of wheel revo lutions or thefa stened
seat belts display
R ambient conditions, su chastemp erature, rain
sensor or distance sensor
Generall y,the use of these data is temp orar y;
th ey will not be stored be yond the period of oper-
ation and will only be processed within theve hicle
itself. Control units oTen contain data memories
fo rve hicle keys,fo rex ample. Their use permits
th ete mp orary or permanent documentation of
te ch nical information about theve hicle's operat- ing state, component loads, main
tenance requ ire-
ments and tech nical events or faults.
Depending on theve hicle equipment, thefo llo w-
ing data are stored:
R operating status of system components, such
as /ll le vels, tyre pressure or battery status
R malfunctions or faults in impor tant system
components, such as lights or brakes
R system reactions in special driving situations,
such as airbag depl oyment or the inter vention
of stability cont rol systems
R information on events leading tovehicle dam-
age
In cer tain cases, it may be requ ired tostore da ta
th at wo uld ha veotherwise been used only temp o-
rari ly. This may be the case if theve hicle has
de tected a malfunction, forex ample.
If yo u use services, such as repair services and
maintenance work, stored operational data as
we ll as theve hicle identi/cation number can be
re ad out and used. They can be read out by
service network emplo yees, such as workshops
and manu facturers or third parties, such as break- down services. The same is true in
the case of
wa rranty claims and quality assurance measures.
In general, there adout is per form ed via the legally
prescribed port forth e diagnostics connection in
th eve hicle. The operational data that are read out
document tech nical states of theve hicle or of
individual components and assist in the diagnosis
of malfunctions, compliance with warranty obli ga-
tions and quality impr ovement. Tothat end, these
data, in particular information about component
loads, tech nical events, malfunctions and other
fa ults may be transmitted along with theve hicle
identi/cation number tothe manufacturer. Fur-
th ermore, the manufacturer is subject toproduct
liability. Forth is reason the manufacturer also
uses operational data from theve hicle, forex am-
ple, forre calls. These data can also be used to
ex amine the customer's warranty and guarantee
claims.
Fa ult memories in theve hicle can be reset by a
service outl etor at your requ est as part of repair
or maintenance work. General no
tes
43 43

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

#
Always ensu rethat all vehicle occupants
ha ve their seat belts fastened co rrectly
and are sitting proper ly.Alw
ays obser vethe inst ructions about the cor rect
driver's seat position and adjusting the seat
(/ page 102).
In order forth e cor rectly wornseat belt toprov ide
th e intended le vel of pr otection, each vehicle
occupant must obser vethefo llowing information:
R The seat belt must not be twisted and must /t
tightly and snugly across the body.
R The seat belt must be routed across the
cent reofthe shoulder and as low down across
th e hips as possible.
R The shoulder section of the seat belt should
not touch your neck nor be routed under your
arm or behind your bac k.
R Avoid wearing bulky clo thing, e.g. a winter
coat.
R Push the lap belt down as far as possible
across your hips and pull tight with the shoul-
der section of the belt. Neverro ute the lap
belt across your abdomen. Pregnant
women must also take particular
care with this.
R Neverro ute the seat belt across sharp, poin-
te d, abrasive or fragile objects.
R Only one person should use each seat belt at
any one time.
R Never secure objects with a seat belt if the
seat belt is also being used byone of theve hi-
cle's occupants.
Also ensu rethat no objects, e.g. a cushion,
are ever placed between a person and the
seat.
If ch ildren are tr avelling in theve hicle, be sure to
obser vethe inst ructions and saf ety no tes on
"Child ren in theve hicle" (/ page 62).
Alw ays obser vethe inst ructions for loading the
ve hicle when securing objects, lug gage or loads
(/ page 116). Limit Limit
ations of t
ations of t he prot
he pr otection pro
ection pro vided b
vided by t
y the seat
he seat
belt
belt &
W
WARNING
ARNING Risk of injury or death due to
incor rect seat position
The seat belt will not o.er the intended le vel
of pr otection if you ha venot mo vedth e seat
backrest toan almost vertical position.
In particular, you may slip under the seatbelt
and injure yourself. #
Adjust the seat proper lybefore begin-
ning your journe y. #
Always ensu rethat the seat backrest is
in an almost vertical position and that
th e shoulder section of your seat belt is
ro uted across the centre of your shoul-
der. Occupant saf
ety
49
49

&
W
WARNI NG
ARNI NGRisk of injury or dea thwhen
additional restraint systems are not used
fo r persons with a smaller stature
Pe rsons under 1.50 m tall cannot wearthe
seat belt cor rectly without a suitable addi-
tional restraint system. #
Always secure persons under 1.50 m tall
in a suitable restraint system. &
W
WARNING
ARNING Risk of injur y or death due to
damaged or modi/ed seat belts
Seat belts cannot pr ovide pr otection in thefo l-
lowing situations:
R the seat belt is damaged, has been modi-
/ed, is extremely dirty, blea ched or dyed
R the seat belt buckle is damaged or
ex tremely dirty
R modi/cations ha vebeen made tothe seat
belt tensioner, seat belt anchorage or seat
belt retractor
Seat belts may sustain non-visible damage in
an accident, e.g. due toglass splinters. Modi/ed or damaged seat belts could
tear or
fa il in theev ent of an accident, forex ample.
Modi/ed seat belt tensioners could acciden-
ta lly trigger or failto function as intended. #
Never modify the seat belt system, for
ex ample the seat belt, seat belt buckle,
seat belt tensioner, seat belt anchorage
and seat belt retractor. #
Make sure that the seat belts are undam-
aged, not wornand clean. #
Always ha vethe seat belts checked
immediately aTer an accident at a quali-
/ed specialist workshop. Mercedes-Benz
recommends that you use seat
belts which ha vebeen appr ovedfo ryo ur vehicle
by Mercedes-Benz.
The spo rts seat is designed forth e standard
th re e-point seat belt. If you /t a di.erent multi-
point seat belt, forex ample a four-point seat belt,
th ere straint system cannot provide the intended
le ve l of pr otection. Depending on
the type of vehicle, there may be
openings in the seat backrest. These openings
ha ve no function. &
W
WARNI NG
ARNI NGRisk of injury or fatal injury due
to modi/ed seat belt systems
If yo ufe ed seat belts thro ugh the opening in
th e seat backrest, the seat backrest may be
damaged or may even break in theeve nt of an
accident. #
Only use the standard thre e-point seat
belt. #
Never modify the seat belt system. &
W
WARNING
ARNING Risk of injury or death from
deplo yedpy rotech nic seat belt tensioners
Pyro tech nic seat belt tensioners that ha ve
been deplo yed are no longer operational and
are unable toper form their intended pr otec-
tive function. #
Therefore, ha vedeplo yedpy rotech nic
seat belt tensioners immedia tely 50
50
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