service MERCEDES-BENZ B-CLASS HATCHBACK 2021 Owner's Manual

Obser
vethe no tes on operating 0uids
(/ page 396).
Ad Blue ®
is available here:
R AdBlue ®
can be topped up byfast se rvice at a
qu ali/ed specialist workshop, e.g. a
Mercedes-Benz Se rvice Centre.
R AdBlue ®
is available at many /lling stations
from AdBlue ®
/lling pumps.
R Alternati vely,Ad Blue ®
is available at quali/ed
specialist workshops, e.g. Mercedes-Benz
Se rvice Centres, and at many /lling stations in
Ad Blue ®
re/ll canis ters or AdBlue ®
re/ll bot-
tles.
% Ensure the connection between there /ll con-
ta iner and vehicle /ller neck does not drip.
T
T opping up A
opping up A dBlue
dBlue®
®
* NO
NOTE
TEEngine damage due toAd Blue ®
being in the fuel #
AdBlue ®
must not be used to/ll the fuel
ta nk. #
Only use AdBlue ®
to /ll theAd Blue ®
ta nk. #
Do not over/ll theAd Blue ®
tank. *
N
NOOTE
TE Contamination of theve hicle inte-
ri or due toAd Blue ®
lea kage #
ATer topping up, carefully close the
Ad Blue ®
re/ll con tainer. #
Avoid car rying AdBlue ®
re/ll con tainers
permanently in theve hicle. R
R
eq
eq uir
uir ements:
ements:
R The vehicle is unloc ked.
The following message s appear in order in the
Instrument Displ aywhen theAd Blue ®
tank
re qu ires topping up:
R Refill AdBlue See Owner’s Manual The
Ad Blue ®
leve l has fallen below there ser ve
ra nge. Top up with at least 5 l of AdBlue ®
.
R Top up AdBlue Emergency op. in XXX miles
See Owner's Manual The lowAdBlue ®
level
will lead tolimited per form ance aTer the re
maining distance displa yed has been driven.
To p up with at least 5 l of AdBlue ®
.
R XX,X l Top up AdBlue Emer. op.: max. XXX
km/h Start not poss. in XXX km The low
Ad Blue ®
leve l will lead tolimited per form ance
from the speed displa yed. ATer there maining
distance displa yed has been co vered, it will no
longer be possible tostart theve hicle. Top up
with at least the amount of AdBlue ®
displa yed.
R XX,X l Top up AdBlue Switch on ignition, wait
60 sec. or eng. start not poss. TheAdBlue ®
ta nk is em pty. Yo u can no longer start the
ve hicle. Top up with at least the amount of
Ad Blue ®
displa yed. Switch on theve hicle and
wa itfor appr oximately 60 seconds. Start the
ve hicle.
Yo u can see theAd Blue ®
range and le vel in the
Service menu in the Instrument Displa y.
% The AdBlue ®
range sh own depends strongly
on the driving style and operating conditions.
The actual range can therefore deviate from
th e calculated range. 196
196
Driving and parking

It is
recommended that youch arge the high-volt-
age battery at a wallbox or charging station due to
th e impr ovedch arging per form ance and better
ch arging e1ciency o.ered.
S
S t
to
o wing t
wing t he c
he char
harging cable
ging cable
Alw ays st owtheve hicle charging cable in the
ch arging cable bag pr ovided and secure it in the
boot or load compartment of your vehicle.
Otherwise, thech arging cable is not su1ciently
secured.
Syst
Syst em limits em limits
The po wer output of the high-voltage battery may
be impaired bythefo llowing:
R High or low outside temp eratures
R Electrical auxiliary consumers in theve hicle
being switched on, e.g. operating the air con-
ditioning system
R Extended periods without charging
The charging time of the high-voltage battery may
be increased bythefo llowing:
R High or low outside temp eratures
R Extended periods without charging R
The maximum available charge cur rent of the
ch arging facility
R The charging cur rent set (mode 2) in the multi-
media system (/ page 301) N
No
ot
tes on c
es on c har
harging t
ging t he high-v
he high-v olt
oltag
age batt
e batt er
ery at t
y at t he
he
mains soc ke
mains soc ket (mode 2)
t (mode 2) &
D
DAN
AN GER
GER Risk of fatal injury from incor-
re ctly ins talled component parts
Connecting thech arging cable toa mains
soc ket using incor rectly ins talled component
parts could cause a /re or an electric shoc k,
fo rex ample. #
Only connect thech arging cable to a
mains soc ketth at:
R Has been proper lyinstalled and
R Has been inspected byaqu ali/ed elect ri-
cian #
For saf etyre asons, only use thech arging
cable supplied with theve hicle or an
original Mercedes-Benz charging cable. #
Purchase these parts at a Mercedes-
Benz Service Centre and obtain advice
th ere.
Mercedes-Benz thoroughly tests these original
ch arging cables forth eir suitability for high-
vo ltage charging of your vehicle. #
Never use a damaged charging cable. #
Do not use:
R Extension cables
R Extension reels
R Multiple soc kets #
Never use soc ket ada pters toconnect
th ech arging cable tothe mains soc ket.
The only exception being if the adap ter
has been tested and appro vedby the
manufacturer forch arging the high-volt-
age battery of an electric vehicle. #
Obser vethe saf ety no tes in the operat-
ing inst ructions forth e soc ket ada pter. Only
thefo llowing charging cables may be used:
R The charging cable supplied with theve hicle. 200 200
Driving and parking

higher
than the amount of energy actually absor-
bed bythe high-voltage batter y.This is there sult
of di.erent le vels of charging losses and is descri-
bed as rech arge e1ciency. Charging losses occur,
fo rex ample, due toheat that builds up when
ch arging or from auxiliary consumers that are
switched on. Further information on rech arge e1-
ciency can be obtained at a quali/ed specialist
wo rkshop. Se
Se
tting t
tting t he maximum per
he maximum per missible c
missible c har
harging cur-
ging cur-
r
r ent f
ent f or c
or char
harging at a mains soc ket
ging at a mains soc ket *
N
NO
OTE
TE Overloading the mains soc ket due
to excessive charging cur rent If
th ech arging cur rent is too high, the fuse
could be tripped or theex tern al mains supply
could overheat. #
Make sure that theex tern al mains supply
has been designed tohandle the set
ch arging cur rent. #
If necessar y,reduce the set charging
cur rent or use a di.erent mains soc ket. #
For saf etyre asons, only use thech arging
cable supplied with theve hicle or an
original Mercedes-Benz charging cable.
Mercedes-Benz thoroughly tests these
original charging cables forth eir suitabil-
ity for high-voltage charging of your vehi-
cle. Pur chase these parts at a Mercedes-
Benz Service Centre and obtain advice
th ere. #
Check the setting of the maximum
ch arge cur rent using thech arging capa-
city shown in the Instrument Displa y. Before
charging at a mains soc ket, ha vethe maxi-
mum permissible charging cur rent forth ere leva nt
mains soc ket or the building inspected byaqu ali-
/ed elect rician. The charging cable supplied is set
to a countr y-speci/c maximum charging cur rent
va lue. When charging abroad, the maximum value
may exceed the permitted value forth at countr y.
When abroad, obser vethe count ry-speci/c la ws
when charging. If you ha vequestions concerning
setting thech arging cur rent or if there is a mal-
function, please contact a quali/ed specialist
wo rkshop. #
Set the maximum permissible charging cur-
re nt in the multimedia system menu
(/ page 301).
If th eex act value of the maximum permissible
ch arging cur rent cannot be set, select the next
smaller adjustable value.
% Ifth eve hicle requ ires more time than usual to
ch arge the high-voltage batter y,ch eck the
maximum charging cur rent settings in the
multimedia system menu. Ov Ov
er
er vie
vie w of t
w of t he c
he char
harging cable contr
ging cable contr ol panel
ol panel The
charging cable cont rol panel sho ws the cur-
re nt status of thech arging process. Driving and parking
203
203

*
N
NO
OTE
TE Damage totheve hicle due toitro ll-
ing away #
Always secure theve hicle against rolling
awa y. #
Bring theve hicle toa standstill bypressing the
brake pedal. #
Ongradients, turn the front wheels so that the
ve hicle will rollto wa rdsth eke rb if it starts
moving. #
Apply the electric parking brake. #
V
Vehicles wit
ehicles wit h manual tr
h manual tr ansmission:
ansmission: Engage
/rst 0047orreve rsege ar 005E. #
V
Vehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: Engage
transmission position 005Din a stationary vehi-
cle with the brake pedal applied
(/ page 188). #
Switch o. theve hicle bypressing the1 but-
to n. #
Release the service brake slo wly. #
Get out of theve hicle and lock it.
% When you park theve hicle, you can still oper-
ate the side windo wsand the panoramic slid-
ing sunroof for appr oximately four minutes if
th e driver's door is closed. Gar
Gar
ag
age door opener
e door opener Pr
Pr
ogr
ogr amming butt
amming butt ons f
ons for t
or the g
he g ar
arag
ag e door opener
e door opener &
D
DAN
AN GER
GER Risk of fatal injuries caused by
ex haust gases
Combustion engines emit poisonous exhaust
ga ses such as carbon monoxide. Inhaling
th ese exhaust gases is hazardous tohealth
and leads topoisoning. #
Never lea vetheve hicle or, if present, the
stationa ryheater running in an enclosed
space without su1cient ventilation. &
W
WARNI NG
ARNI NGRisk of injury bybecoming
trapped when opening and closing a
ga rage door
When you operate or prog ram a garage door
with an integ ratedga rage door opener, per-
sons can become trapped or struck bythe
ga rage door if they stand wi thin its range of
mo vement. 216 216
Driving and parking

R
the electric parking brake is not applied N
No
ot
tes on par
es on par king up t
king up the v
he vehicle
ehicle If
yo u lea vetheve hicle par ked up for longer than
six weeks, it may su.er damage thro ugh disuse.
The 12 V battery may also be impaired or dam-
aged byheavy discharging.
V
V ehicles wit ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: do not dis-
connect the 12 V battery even if theve hicle is leT
idle for a lengt hyperiod.
% Further information can be obtained at a
qu ali/ed specialist workshop. S
S
t
tandb
andb y mode (e
y mode (e xt
xtension of t
ension of t he st
he start
arter batt
er batt er
ery's
y's
per
per iod out of use)
iod out of use) S
S
t
tandb
andb y mode function
y mode function
% This function is not available for all models.
If standby mode is activated, energy loss will be
minimised during extended periods of non-opera-
tion. St
andby mode is characterised bythefo llowing:
R The star ter battery is preser ved.
R The maximum non-operational time appears in
the media displa y.
R The connection toonline services is inter rup-
te d.
R The ATA (anti-theT alarm system) is not availa-
ble.
R The interior pr otection and tow- aw ay protec-
tion functions are not available.
R The function for de tecting collisions on a
par kedve hicle is not available.
If th efo llowing conditions are ful/lled, standby
mode can be activated or deactivated using the
multimedia system:
R The vehicle is switched on.
R The vehicle has not been star ted.
Exceeding theve hicle's displ ayed non-operational
time may cause incon venience; i.e. it cannot be
guaranteed that the star ter battery will reliably
start theve hicle. Char
gethe star ter battery in thefo llowing situa-
tions:
R The vehicle's non-ope rational time must be
ex tended.
R The Battery charge insufficient for standby
mode messa geappears in the media displa y.
% Standby mode is automatically deactivated
when theve hicle is switched on.
A
A ctiv ctiv ating/deactiv
ating/deactiv ating st
ating standb
andby mode (par
y mode (par king up
king up
t
t he v
he v ehicle)
ehicle)
R
R eq
eq uir
uir ements:
ements:
R The engine is switched o..
Multimedia system: 4 © 5
Settings 5
Vehicle #
Activate or deactivate Standby mode. #
Select Yes. 222
222
Driving and parking

7
Coolant temp erature display
During normal operation, the coolant temp er-
ature display is permitted torise to120°C.
8 Selected drive prog ram
9 Selected transmission position
A Centre display area of the inst rument display
(e xamp le: standard display for trip): Assis-
ta nce / Telephone / Navigation / Trip /
Media / Radio / Styles and displa ys /
Service / Powe r me ter (equipment-depend-
ent)
B Fuel le vel, fuel /ller 0ap location indicator,
ra nge Ov
Ov
er
ervie
vie w of butt
w of butt ons on t
ons on the st
he steer
eer ing wheel
ing wheel 1
P Back/Home button (p ress and hold),
on-board computer
2 Touch Control, on-board computer
3 Control panel for cruise control/limiter or
Ac tive Distance Assist DISTRONIC
4 Control panel forth e MBUX multimedia sys-
te m (/ page 288) £
LINGU ATRO NIC
5 00E2 Tocall up the home screen of the multi-
media system
6 Touch Control multimedia system
7 0038 Back button (multimedia system)
8 Brightness control toadjust the lighting in the
Instrument Displ ayand in the control ele-
ments of theve hicle interior Oper
Oper
ating t
ating t he on-boar
he on-boar d com
d comput
puter
er
Obser vethe legal requ irements forth e country in
which you are cur rently driving when ope rating
th e on-board computer. 282
282
Instrument display and on-board computer

The on-board computer is ope
rated using the leT-
hand Touch Control and the leT-hand back/home
button.
When the on-board computer is being operated,
di.erent acoustic signals will sound as operating
fe edbac k,e.g. when the end of a list is reached or
when you are scrolling thro ugh a list.
The following menus are available:
R Assistance
R Telephone
R Navigation
R Trip
R Radio
R Media
R Styles & display
R Service
% You can /nd information about the possible
settings and selections on the menus in the
Digital Owner's Manual.
The menus can be called up from the menu bar
on the inst rument displa y. #
T To call up t
o call up t he menu bar:
he menu bar: pressthe leT-hand
back button until the menu bar is displa yed.
% V
Vehicles wit
ehicles wit hout A
hout Activ
ctive Dist
e Dist ance Assis
ance Assist t
DIS
DIS TR
TRONIC:
ONIC: pressthe00E2 button tocall up
th e menu bar of the on-board computer. #
T
To scr
o scr oll on t
oll on t he menu bar
he menu bar :
:swipe leT or right
on the leT-hand Touch Control. #
T
To call up a menu, submenu or possible se
o call up a menu, submenu or possible se t-
t-
tings on t
tings on t he menu, or
he menu, or con/rm
con/rma selection or
a selection or
se
se tting:
tting: press the leT-hand Touch Control. #
T
To scr
o scr oll t
oll thr
hrough display
ough display s or lis
s or lists on tts on the
he
menu, or select displa
menu, or select displa y cont
y content, a function,
ent, a function,
an entr
an entr y or a display
y or a display :
:swipe upwards or down-
wa rds on the leT-hand Touch Control. #
T
To e
o e xit a submenu:
xit a submenu: pressthe leT-hand back
button.
Selecting t
Selecting t he head-up display
he head-up display #
T
To switc
o switc h on t
h on the head-up display
he head-up display :
:switch on
th e head-up display via the multimedia system
or activate it on the menu bar byswiping
upwards on the leT-hand Touch Control.
The head-up display menu will be selected on
th e head-up displa y. #
T To switc
o switc h t
h to t
o t he head-up display
he head-up display :
:press the
leT-hand Touch Control or swipe upwards on
th e leT-hand Touch Control. #
T
To se
o se t t
t the t
he t hr
hree displa
ee displa y r
y rang
ang es of t
es of t he head-up
he head-up
display
display :
:swipe upwards or down wards on the
leT-hand Touch Control.
F
F ull-scr
ull-scr een menus
een menus
V
V ehicles wit
ehicles wit h an ins
h an instrtrument displa
ument displa y in t
y in the wide-
he wide-
scr
scr een coc
een coc kpit:
kpit:thefo llowing menus can be
shown full-screen on the inst rument displa y:
R Assistance
R Trip
R Navigation #
Onthe cor responding menu, use the leT-hand
To uch Control toscroll tothe end of the list. #
Press the leT-hand Touch Control.
The selected menu will be displa yed full-
screen. Inst
rument display and on-board computer
283
283

A
Application and cur rent information
B Quic k-access, e.g. enter home address
C Index points and selected displ ayarea
D Calls up the air conditioning menu
E Calls up SUGGESTIONS, THEMESand
FAVOURITES
% If Mercedes me connect 5is active , the
ve hicle is lin ked with Mercedes me connect.
Ve hicle data is then transmitted tothe bac k-
end system. What data is transmitted
depends on which services are activated. Fur-
th er de tails can be found in the Mercedes me
connect term s and conditions and data pro-
te ction information. The function is count ry-
dependent.
If transmission of vehicle position 6is
active , Mercedes me connect services ha ve
been activated forth is vehicle which access
th eve hicle's geoposition. In which ins tances
th ege oposition is transmitted depends on the
particular services. Further de tails can be
fo und in the Mercedes me connect term s and
conditions and data pr otection information.
The function is countr y-dependent. Oper Oper
ating t
ating t he MBUX multimedia syst
he MBUX multimedia syst em
em Using T Using T
ouc
ouc h Contr
h Contr ol ol 1
© Calls up the home screen
2 Touch Control
3 G Press brie0y: returns tothe pr evious
display
4 ß Press thero ck er switch down brie0y:
sho wsfavo urites ß
Press thero ck er switch down and hold:
adds favo urites and themes
° Turn cont roller: adjusts thevo lume
0063 Press controller: switches o. the sound
0061 Press thero ck er switch up: makes or
accepts a call
0076 Press thero ck er switch down: rejects or
ends a call
Na vigation thro ugh the menus is car ried out with
To uch Control 2with single-/nger swipes. #
T To select a menu op
o select a menu op tion:
tion:swipe and press. #
T To mov o mov e t
e the digit
he digit al map:
al map: swipe in any direc-
tion.
Using t
Using t he t
he touc
ouchscr
hscr een
een #
Select menu options, symbols or characters
by pressing brie0y. #
T
To na
o na vig
vigat
ate in menus:
e in menus: swipe up, down, leT or
ri ght. #
T
To use handwr
o use handwr iting t
iting to ent
o enter c
er char
haract
acter
ers:
s: write
th ech aracter with one /nger on the
to uchscreen. 290
290
MBUX multimedia system

or
#
Say "Hello Mercedes". Ov
Ov
er
ervie
vie w of t
w of t he MBUX Int
he MBUX Int er
erior Assist
ior Assist ant
ant &
W
W ARNING
ARNING Risk of injury from the cam-
era's laser radiation
This product uses a classi/cation 1 laser sys-
te m. If the housing is opened or damaged,
laser radiation may damage your retina. #
Do not open the housing. #
Always ha vemaintenance workand
re pairs car ried out byaqu ali/ed special-
ist workshop. This device is a class 1 laser product in accord-
ance with IEC 60825-1:2014 and DIN EN
60825-1:2014. The camera is located in
theove rhead control
panel.
If th eve hicle is /tted with the MBUX Interior
Assistant, selected functions of the multimedia
system can be operated contact-free. The MBUX
Interior Assistant can di.erentiate between driver
and front passenger interactions and de tects spe-
ci/c hand positions (poses).
Syst
Syst em limits, displa em limits, displa y messag
y messages and not
es and not es f
es for
or
r
r ecti/cation
ecti/cation
The system may be impaired or may not function
in thefo llowing situations:
R The camera in theove rhead control panel may
heat up due tooperating conditions. As a
re sult the camera may switch o. temp oraril y,
particular lyduring longer periods of operation
and at high outside temp eratures.
Do not touch or co verth e camera and wait
until the camera has cooled down and is avail-
able again. R
The camera is co vered, dirty, misted up or
scratched.
Wa it until the camera has cooled down before
cleaning the camera lens.
Clean the outside of the camera lens with a
dry or damp cotton clo th. Do not use micro/-
bre clo ths. Do no not tre mo vethe co ver when
cleaning.
R Recognition can be impaired byre0ective
clo thing, an adverse colour of clo thing or by
accessories, forex ample.
R Clothing being worn(hat, sha wl, scarf) may be
limiting the de tection area of the camera.
Ke ep the camera's /eld of vision clear.
R The camera is not operational.
Consult a Mercedes-Benz service centre. MBUX multimedia system
293 293

#
Select Maximum ,8 amps or6 amps .
When the battery is charge d, thech arging cur-
re nt is limi tedto the selected amperage.
% For saf etyre asons, only use thech arging
cable supplied with theve hicle or an original
Mercedes-Benz charging cable. Mercedes-
Benz thoroughly tests these original charging
cables forth eir suitability forth e high-voltage
ch arging of your vehicle. Pur chase these parts
from your Mercedes-Benz Service Centre and
obtain advice there.
A
A ctiv
ctiv ating or deactiv
ating or deactiv ating r
ating rout
oute-based oper
e-based oper ating
ating
mode s
mode str trat
at egy
egy #
Select Electric in city .
Depending on the pr evious status, the func-
tion is activated or deactivated. Calling up t Calling up t
he ener
he energy
gy0ow
0ow display
display Multimedia system:
4 © 5
EQ #
Select Energy flow.
The visualisation of the energy 0ow in theve hi-
cle is displ ayed. In addition
tothe energy 0o w,information on the
status of thehy brid system and the cur rent state
of charge ofthe high-voltage battery is also dis-
pla yed. F F
unctions of t
unctions of t he ener
he energy
gy0ow
0ow display
display 1
State of charge ofthe high-voltage battery
2 Combustion engine
3 Energy 0ow
4 High-voltage battery
5 Status of thero ute-based operating-mode
strategy (/ page 181) The active components of
thehy brid system are
highlighted in the energy 0ow displa y.The energy
0ow between the individual components is shown
in colour.
The energy 0ow is shown in di.erent colours
depending on the operating status:
R Whit
Whit e: e:constant energy 0ow
R R
Red:
ed: high energy 0ow (boost e.ect)
R Gr
Green:
een: low- emission energy 0ow in the case of
re cuperation, elect ric mode and when charg-
ing the high-voltage battery N
N
a
avig
vig ation
ation N
No
ot
tes on na
es on na vig
vigation
ation R
R
out
out e guidance wit
e guidance wit h augment
h augmented r
ed reality
eality &
W
WARNING
ARNING Risk of accident and injury as a
re sult of distraction, inco rrect depiction or
wrong interpr etation of the display
The camera image of the augmented reality
displ ayis not suitable as a guide for driving. 302
302
MBUX multimedia system