service reset MERCEDES-BENZ A-CLASS HATCHBACK 2021 Owners Manual

Connecting and using ano
ther device with the
diagnostics connection can ha vethefo llowing
e.ects:
R Malfunctions in theve hicle system
R Perm anent damage tovehicle components
Please referto thewa rranty term s and conditions
fo rth is matter.
Moreo ver,connecting equipment tothe diagnos-
tics connection can lead toemissions monitoring
information being reset, forex ample. This may
lead totheve hicle failing tomeet there qu ire-
ments of the next emissions inspection during the
main inspection. Quali/ed
Quali/ed
specialis
specialist w
t work
ork shop
shop
A qu ali/ed specialist workshop has the necessary
special skills, tools and quali/cations tocor rectly
car ryout any necessary workon your vehicle.
This particular lyapplies tosaf ety-re leva nt wo rks.
Alw ays ha vethefo llowing workcar ried out on
yo ur vehicle at a quali/ed specialist workshop:
R Safety-re leva nt wo rks R
Service and maintenance work
R Repair work
R Modi/cations as well as installations and con-
ve rsions
R Workon electronic components
R Plug-in h
Plug-in h ybr
ybrid:
id:workon thehy brid system
Mercedes‑Benz recommends a Mercedes‑Benz
service cent re. V
V
ehicle r
ehicle r egis
egistrtration
ation
Mercedes-Benz may ask its service centres to
car ryout tech nical inspections on cer tain vehi-
cles. The quality or saf ety of theve hicle is
impr oved as a result of the inspection.
Mercedes-Benz can only inform you about vehicle
ch ecks if Mercedes-Benz has your registration
data.
It is possible that your vehicle has not yetbeen
re gistered in your name in thefo llowing cases:
R ifyo ur vehicle was not pur chased at an author-
ised specialist deale r. R
ifyo ur vehicle has not yetbeen examined at a
Mercedes-Benz service cent re.
It is advisable toregister your vehicle with a
Mercedes-Benz service cent re.
Inform Mercedes-Benz as soon as possible about
any change in address or vehicle ownership. Yo u
can do this at a Mercedes-Benz service centre,
fo rex ample. Corr Corr
ect use of t
ect use of t he v
he vehicle
ehicle
If yo ure mo veany warning stic kers,yo u or others
could failto recognise cer tain dangers. Lea ve
wa rning stic kers in position.
Obser vethefo llowing information in particular
when driving your vehicle:
R the saf ety no tes in this Owner's Manual, vehi-
cle-speci/c supplements and fu rther supple-
men tary documents
R tech nical data forth eve hicle
R tra1c rules and regulations
R laws and saf etystanda rds per taining tomo tor
ve hicles 40
40
Gene
ral no tes

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

Conv
Conv
enience and inf ot
enience and inf otainment functions
ainment functions
Yo u can store con venience settings and individual
settings in theve hicle and change or reset them
at any time.
Depending on theve hicle equipment, this
includes thefo llowing settings, forex ample:
R seat and steering wheel positions
R suspension and climate cont rol settings
R individual settings, such as interior lighting
Depending on the selected equipment, you can
import data into vehicle inf otainment functions
yo urself.
Depending on theve hicle equipment, this
includes thefo llowing data, forex ample:
R multimedia data, such as music, /lms or pho-
tosfo r playback in an integ rated multimedia
system
R address book data for use in connection with
an integ rated hands-free system or an integ ra-
te d navigation system
R entered navigation destinations
R data about the use of Internet services These data
for con venience and inf otainment
functions may be sa ved locally in theve hicle or
th ey may be located on a device which you ha ve
connected totheve hicle, such as a smartphone,
USB 0ash drive or MP3 pla yer.Ifyo u ha veentered
th ese data yourself, you can dele tethem at any
time.
This data is transmitted from theve hicle tothird
parties only at your requ est. This applies, in par-
ticular, when you use online services in accord-
ance with the settings that you ha veselected.
Smar
Smar tphone int tphone int egr
egration (e.g. Andr
ation (e.g. Andr oid A
oid Aut
uto or
o or
Apple CarPlay
Apple CarPlay ®
®
)
)
If yo ur vehicle is accordingly equipped, you can
connect your smartphone or ano ther mobile end
device totheve hicle. You can then control them
by means of the control elements integ rated in
th eve hicle. Images and audio from the smart-
phone can be output via the multimedia system.
Cer tain information is simultaneously transfer red
to your smartphone. Depending on the type and
integ ration, this includes position data, day/night
mode and other general vehicle statuses. For
more information please consult the Owner's
Manual of theve hicle/inf otainment system. This integ
ration allo ws the use of selected smart-
phone apps, such as navigation or music pla yer
apps. There is no fu rther interaction between the
smartphone and theve hicle; in particular, vehicle
data is not directly accessible. The type of addi-
tional data processing is de term ined bythe pro-
vider of the app being used. Which settings you
can make, if an y,depends on the speci/c app and
th e operating system of your smartphone. Online ser Online ser
vices
vices W
W
ir
ireless ne
eless ne tw
twor
ork connection
k connection
If yo ur vehicle has a wireless network connection,
it enables data tobe exch anged between your
ve hicle and additional systems. The wireless net-
wo rkconnection is made possible bytheve hicle's
ow n transmitter and receiver or bya mobile end
device that you ha vebrought into theve hicle, for
ex ample, a smartphone. Online functions can be
used via the wireless network connection. This
includes online services and applications/apps
pr ov ided toyouby the manufacturer or by other
pr ov iders. 44 44
General no
tes

%
Websites cannot be shown while theve hicle is
in motion. Ov
Ov
er
ervie
vie w of smar
w of smar tphone int
tphone int egr
egration
ation Wi
th Sma rtphone Integ ration, you can use cer tain
functions on your mobile phone via the multime-
dia system displa y.
Only one mobile phone at a time can be connec-
te d via Smartphone Integ ration tothe multimedia
system. Also for use with two phone mode with
smartphone integ ration, only one additional
mobile phone can be connec ted using Blue tooth ®
with the multimedia system.
The full range of functions for Smartphone Inte-
gr ation is only possible with an Internet connec-
tion. The appropriate application must be down-
loaded on the mobile phone touse Smartphone
Integ ration. The mobile phone must be switched
on and connec tedto a USB port with theç
symbol on the multimedia system using a suitable
cable.
Apps for Smartphone Integ ration
R Apple CarPlay ® R
Android Auto
% For saf etyre asons, the /rst activation of
Smartphone Integ ration on the multimedia
system must be car ried out when theve hicle
is stationary and the parking brake is applied.
Yo u can start Apple CarPlay ®
or Android Auto
from the device manager.
% Mercedes-Benz recommends disconnecting
th e connecting cable only when theve hicle is
stationar y.
Ov
Ov er ervie
vie w of tr
w of tr ansf
ansferr
erred v
ed v ehicle data
ehicle data
When using Smartphone Integ ration, cer tain vehi-
cle data is transfer redto the mobile phone. This
enables youto get the best out of selected mobile
phone services. Vehicle data is not directly acces-
sible.
The following system information is transmitted:
R SoTware release of the multimedia system
R System ID (anonymised)
The transfer of this data is used tooptimise com-
munication between theve hicle and the mobile
phone. To
do this, and toassign se veralve hicles tothe
mobile phone, a vehicle identi/er is random lyge n-
erated.
This has no connection totheve hicle identi/ca-
tion number (VIN) and is dele ted when the multi-
media system is reset (/ page 298).
The following driving status data is transmitted:
R Transmission position engaged
R Distinction between par ked, standstill, rolling
and driving
R Day/night mode of the inst rument clus ter
R Drive type
The transfer of this data is used toalter how con-
te nt is displa yedto cor respond tothe driving sit-
uation.
The following position data is transmitted:
R Coordinates
R Speed
R Compass direction
R Acceleration direction MBUX multimedia system
319 319

R
Frequent operation in mountainous terrain or
on poor road sur faces
R When the engine is oTen leT idling for long
periods
R Operation in particular lydusty conditions
and/or if air-recirculation mode is frequently
used
In these or similar operating conditions, ha vethe
interior air /lter, air /lter, engine oil and oil /lter,
fo rex ample, changed more frequentl y.The tyres
must be checked more frequently if theve hicle is
operated under increased loads. Further informa-
tion can be obtained at a quali/ed specialist work-
shop. Batt Batt
er
ery disconnection per
y disconnection per iods
iodsThe AS
SYST PLUS service inter val display can cal-
culate the service due date only when the battery
is connected. #
Display and no tedown the service due date
on the inst rument display before disconnect-
ing the battery (/ page 330). Engine com
Engine com
par
partment
tment A
A
ctiv
ctiv e bonne
e bonne t (pedes
t (pedestr trian pr ot
ian pr otection)
ection) Oper
Oper
ation of t
ation of t he activ
he active bonne
e bonne t (pedes
t (pedestr trian pr ot
ian pr otec-
ec-
tion)
tion)
In cer tain accident situations, the actuation of the
active bonnet reduces therisk of injury topedes-
trians. The rear area of the bonnet is raised by
appr oximately 70 mm.
Fo rth e drive tothewo rkshop, reset the actuated
active bonnet yourself (/ page 331).
ATer the active bonnet has been actuated, pedes-
trian pr otection may be limited.
Ha ve the full functionality of the active bonnet
re stored in a quali/ed specialist workshop.
R
R ese ese tting t
tting t he activ
he activ e bonnet
e bonnet &
W
WARNING
ARNING Risk of burns from hot compo-
nent parts in the engine compartment
Cer tain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of theex haust system. #
Allow the engine tocool down and only
to uch component parts described in the
fo llowing. #
With your hand 0at, push down active bonnet
1 inthe area around the hinges on bo th
sides (ar rows ).
In doing so, the actuator is depressurised and
yo u may hear a hissing sound.
The engine bonnet must engage in position. #
Ifth e active bonnet can be raised slightly at
th ere ar in the area of the hinges, repeat the
step until it engages co rrectl y. Maintenance and ca
re
331
331