MERCEDES-BENZ B-CLASS HATCHBACK 2021 Owners Manual

#
Pull plug 7with the cable and /ller hose 3
out of the tyre in0ation compressor housing. #
Insert tyre sealant bottle 9in soc ket6 of
th e tyre in0ation compressor in such a way
th at there d ar row on tyre sealant bottle 9
matches there d ar row on the tyre in0ation
compressor. #
Turn tyre sealant bottle 9aqu arter turn
clockwise. #
Insert the plug of /ller hose 3in soc ket5
of tyre sealant bottle 9. #
Turn /ller hose 3aqu arter turn clockwise. #
Remo vetheva lve cap from valve A onthe
fa ulty tyre. #
Screw union nut 4of /ller hose 3onto
va lve A. #
Insert plug 7into a 12 V soc ket in your vehi-
cle. #
Turn theke yto position 0047inthe ignition loc k. #
Press on and o. switch 8onthe tyre in0a-
tion compressor.
The tyre in0ation compressor is switched on.
The tyre is in0ated. Firs t, tyre sealant is pum-
ped into the tyre. The pressure may brie0y rise
to appr oximately 500 kPa (5 bar/73 psi).
Do no Do no t switc
t switc h
ho.
o. t
the tyr
he tyr e
ein0ation
in0ation com
compr
pressor
essor
dur
dur ing t
ing t his phase!
his phase! #
Let the tyre in0ation compressor runfo r a
maximum of ten minutes.
The tyre should then ha veattained a tyre pres-
sure of at least 200 kPa (2.0 bar/29 psi).
If tyre sealant leaks out, make sure you clean the
a.ected area as quickly as possible. It is prefera-
ble touse clean water.
If yo uget tyre sealant on your clo thing, ha veit
cleaned as soon as possible with per chloroe thy-
lene.
If, If, aTer
aTer t
ten minut
en minut es, a tyr
es, a tyre pr
e pressur
essur e of 200 kPa
e of 200 kPa
(2.0 bar/29 psi) has no
(2.0 bar/29 psi) has no t been att
t been att ained:
ained: #
Switch o. the tyre in0ation compressor. 358
358
Breakdown assistance

#
Unscr ewthe /lling hose from theva lve of the
defective tyre.
Please no tethat tyre sealant may leak out when
unscr ewing the /lling hose. #
Drive forw ards or in reve rseve ry slo wly for
appr oximately 10 m. #
Pump up the tyre again.
ATer a maximum of ten minutes the tyre pres-
sure must be at least 200 kPa (2.0 bar/
29 psi). &
W
W ARNING ARNING Risk of accident due tothe
speci/ed tyre pressure not being attained
If th e speci/ed tyre pressure is not attained
aTer the speci/ed time, the tyre is too badly
damaged. The tyre sealant cannot repair the
tyre in this instance.
The braking and driving characteristics may be
gr eatly impaired. #
Do not continue driving. #
Consult a quali/ed specialist workshop. *
N
NOOTE
TE Staining from leaking tyre sealant ATer use,
excess tyre sealant may leak out
from the /lling hose. #
Therefore, place the /lling hose in the
plastic bag that contained the TIREFIT
kit. If,
If,
aTer
aTer t
ten minut
en minut es, a tyr
es, a tyre pr
e pressur
essur e of 200 kPa
e of 200 kPa
(2.0 bar/29 psi) has been att
(2.0 bar/29 psi) has been att ained:
ained: #
Switch o. the tyre in0ation compressor. #
Unscr ewthe /lling hose from theva lve of the
defective tyre.
Please no tethat tyre sealant may leak out when
unscr ewing the /lling hose. &
W
WARNING
ARNING Risk of accident from driving
with sealed tyres
A tyre temp orarily sealed with tyre sealant
impairs the handling characteristics and is not
suitable for higher speeds. #
Adapt your driving style accordingly and
drive carefull y. #
Do not exceed the maximum speed limit
with a tyre that has been repaired using
tyre sealant. #
Obser vethe maximum permissible speed for a
tyre sealed with tyre sealant 80 km/h. #
The stic ker with de tails of the maximum per-
missible speed must be a1xed tothe inst ru-
ment cluster where it can be easily seen by
th e driver.
* N
NOOTE
TE Staining from leaking tyre sealant ATer use,
excess tyre sealant may leak out
from the /lling hose. #
Therefore, place the /lling hose in the
plastic bag that contained the TIREFIT
kit. Breakdown assistance
359
359

+
ENVIR
ENVIR
ONMENT
ONMENT AL NO
AL NOTE
TE Environmen tal
pollution caused byenvironmentally ir re-
sponsible disposal Ty
re sealant contains pollu tants. #
Have the tyre sealant bottle disposed of
professionall y,e.g. at a Mercedes-Benz
Service Centre. #
Stow the tyre sealant bottle, the tyre in0ation
compressor and thewa rning triangle. #
Pull awa
Pull away immediat
y immediat ely.
el y. #
Stop driving aTer appr oximately ten minutes
and check the tyre pressure using the tyre
in0ation compressor.
The tyre pressure must now be at least
130 kPa (1.3 bar/19 psi). &
W WARNING
ARNING Risk of accident due tothe
speci/ed tyre pressure not being attained
If th e speci/ed tyre pressure is not reached,
th e tyre is too badly damaged. The tyre seal-
ant cannot repair the tyre in this instance. The braking and driving
characteristics may be
gr eatly impaired. #
Do not continue driving. #
Consult a quali/ed specialist workshop. Countr
Countr
ies t
ies that hav
hat hav e Mer
e Mercedes-Benz Ser
cedes-Benz Ser vice24h:
vice24h:
yo u will /nd a stic ker with thete lephone number,
e.g. on the B‑pillar on the driver's side. #
Correct the tyre pressure if it is still at least
130 kPa (1.3 bar/19 psi). See the tyre pres-
sure table on the fuel /ller 0ap forva lues.
Incr
Incr easing t
easing t he tyr
he tyre pr
e pressure
essure #
Switch on the tyre in0ation compressor.
Decr
Decr easing t
easing t he tyr
he tyre pr
e pressure
essure #
Remo vethe tyre sealant bottle from the tyre
in0ation compressor. #
Insert the /ller hose in the soc ket of the tyre
in0ation compressor and turn it a quarter turn
clockwise. #
Press pressure release button Cnext to
manome terB.
When t When t he tyr he tyre pr
e pressur
essur e is corr
e is corr ect
ect #
Unscr ewthe /lling hose from theva lve of the
sealed tyre. #
Screw theva lve cap onto theva lve of the
sealed tyre. #
Stow the tyre sealant bottle and the tyre in0a-
tion compressor. #
Drive tothe nearest quali/ed specialist work-
shop and ha vethe tyre, tyre sealant bottle and
/lling hose replaced there. 360
360
Breakdown assistance

Batt
Batt
er
ery (v
y (v ehicle)
ehicle) N
No
ot
tes on t
es on t he 12 V batt
he 12 V batt ery
ery &
W
WARNI NG
ARNI NGRisk of explosion due toelec-
trostatic charge
Electrostatic charge can ignite the highly
ex plosive gas mixtu reinthe batter y. #
Todischar geany elect rostatic charge
th at may ha vebuilt up, touch the me tal
ve hicle body before handling the batter y. The high
ly0ammable gas mixtu reis created while
th e battery is charging and during starting assis-
ta nce. &
W
W ARNI NG
ARNI NGDanger of chemical burns from
th e battery acid
Battery acid is caustic. #
Avoid contact with the skin, eyes or
clo thing. #
Do not lean overth e batter y. #
Do not inhale battery gases. #
Keep children away from the batter y. #
Immediately rinse bat tery acid o. thor-
oughly with plenty of clean water and
seek medical attention immediatel y. +
ENVIR
ENVIR
ONMENT
ONMENT AL NO
AL NOTE
TEEnvironmen tal
damage due toimproper disposal of bat-
te ries Batteries contain pollutants. It is
illegal todispose of them with the household
ru bbish. #
Dispose of batteries in an
environmentally responsible manner.
Ta ke dischar ged batteries toaqu ali/ed
specialist workshop or toa collection
point for used batteries. If
yo u ha vetodisconnect the 12 V batter y,con-
ta ct a quali/ed specialist workshop.
Comply with saf ety no tes and take protective
measures when handling batteries. Risk of
explosion. Fire
, naked 0ames and smoking are
prohibi ted when handling the batter y.
Av oid creating spar ks. Electrolyte or battery acid is cor
rosive.
Av oid contact with the skin, eyes or
clo thing. Wear suitable pr otective
clo thing, in particular glo ves, an apron
and a face mask. Immediately rinse
electrolyte or acid splashes o. with
clean water. Consult a doctor if neces-
sar y. We
ar saf ety glasses. Breakdown assis
tance
361 361

Ke
ep children away. Obser
vethis Owner's Manual.
If yo u do not intend touse theve hicle over an
ex tended period of time:
R activate standby mode, or
R connect the battery toa battery charger
appr ovedby Mercedes-Benz, or
R consult a quali/ed specialist workshop todis-
connect the battery N
No
ot
tes on st
es on st ar
arting assist
ting assist ance and c
ance and c har
harging t
ging t he 12
he 12
V batt
V batt ery
ery When
charging the battery and during starting
assistance, alw ays use the jump-start connection
point in the engine compartment. *
N
NO OTE
TE Damage tothe battery from over-
vo ltage When
charging using a battery charge r without
a re striction of the maximum charging voltage,
th e battery or the on-board electronics can be
damaged. #
Only use battery charge rs with a maxi-
mum charging voltage of 14.8 V. &
W
WARNI NG
ARNI NGRisk of explosion due tohydro-
ge nga s igniting
If, when charging a batter y,there is a short
circuit or spar ksstart toform ,th ere is a dan-
ge r of hydrogen gas igniting. #
Take care that the positive clamp con-
nected toa battery does not come into
contact with vehicle parts. #
Never place me tal objects or tools on a
batter y. #
When connecting and disconnecting the
batter y,alw ays obser vethe sequence of
battery clamps described. #
Take care toonly connect battery term i-
nals of identical polarity when receiving
starting assistance. #
Obser vethe sequence described for
connecting and disconnecting the jump
leads when receiving starting assistance. #
Do not connect or disconnect the bat-
te ry term inals while the engine is run-
ning. &
W
WARNI NG
ARNI NGRisk of explosion due toexplo-
sive mixture of gases
An explosive mixture of gases can escape
from the battery during charging and starting
assis tance. #
Fire , naked 0ames, smoking and creating
spar ksmust be avoided. #
Make sure there is adequate ventilation. #
Do not stand overth e batter y. 362
362
Breakdown assistance

&
W
W ARNI NG
ARNI NGRisk of explosion from a frozen
battery
A dischar ged battery may freeze at temp era-
tures slightly abo veor below freezing point.
During starting assistance or battery charging,
battery gas can be released. #
Always allow a battery tothaw before
ch arging it or per form ing starting assis-
ta nce. If
th e indicator/warning lamps in the inst rument
cluster do not light up at low temp eratures, it is
ve ry likely that the dischar ged battery has frozen.
In this case you may neither jump-start theve hi-
cle nor charge the batter y.
The service life of a bat tery that has been thawed
may be dramatically shor tened. The starting char-
acteristics may be impaired, especially at low
te mp eratures.
It is recommended that you ha veath awe d battery
ch ecked at a quali/ed specialist workshop. *
N
NO OTE
TE Damage caused bynume rous or
ex tended attem ptsto start the engine Numerous or
extended attem ptsto start the
engine may damage the catalytic con verter
due tonon-combusted fuel. #
Avoid numerous and extended attem pts
to start the engine. Obser
vethefo llowing points during starting assis-
ta nce and when charging the batter y:
R Only use undamaged jump lead/charging
cables with a su1cient cross-section and
insulated term inal clamps.
R Non-insulated parts of thete rm inal clamps
must not come into contact with other me tal
parts while the jump lead/charging cable is
connected tothe battery/jump-start connec-
tion point.
R The jump lead/charging cable must not come
into contact with any parts which may mo ve
when the engine is running.
R Always make sure that nei ther you nor the bat-
te ry is electros tatically charge d. R
Keep awa y from /re and naked 0ames.
R Do not lean overth e batter y.
Obser vethe additional following points when
ch arging the batter y:
R Only use battery charge rs tested and
appro vedfo r Mercedes-Benz.
R Read the battery charge r's operating inst ruc-
tions before charging the batter y.
Obser vethe additional following points during
starting assistance:
R For starting assistance, only use batteries with
a nominal voltage of 12 V.
R The vehicles must not touch.
R P
P e etr
tr ol engine:
ol engine: only accept starting assistance
if th e engine and exhaust system are cold. S
S
t
tar
ar ting assist
ting assist ance and c
ance and c har
harging t
ging t he 12 V batt
he 12 V batt ery
ery R
R
eq
eq uir
uir ements:
ements:
R The vehicle is secured with the electric par k-
ing brake. Breakdown assistance
363
363

R
A
Aut
ut omatic tr
omatic tr ansmission:
ansmission: the transmission is in
position 005D.
R Manual tr
Manual tr ansmission:
ansmission: the transmission is in
neutral.
R The vehicle and all elect rical consume rsare
switched o..
R The bonn etis open. #
Slide co ver1 of positive clamp 2onthe
jump-starting connection point in the direction
of the ar row. #
Connect positive clamp 2onyour vehicle to
th e positive pole of the donor battery using
th e jump lead/charging cable. Alw ays begin
with positive clamp 2onyour ow nve hicle
/rst. #
Dur
Dur ing st
ing st ar
arting assist
ting assist ance:
ance:startthe engine of
th e donor vehicle and run at idle speed. #
Connect the negative pole of the donor bat-
te ry and ear thpoint 3ofyour ow nve hicle by
using the jump lead/charging cable. Begin
with the donor battery /rst. #
Dur
Dur ing st
ing st ar
arting assist
ting assist ance:
ance:startthe engine of
yo ur ow nve hicle. #
Dur
Dur ing t ing t he c
he char
harging pr
ging pr ocess:
ocess: startthech arg-
ing process. #
Dur
Dur ing st ing st ar
arting assist
ting assist ance:
ance:letthe engines run
fo r se veral minutes. #
Dur
Dur ing st ing st ar
arting assist
ting assist ance:
ance:before disconnect-
ing the jump lead, switch on an electrical con- sumer on
your ow nve hicle, e.g. there ar win-
dow heater or lighting.
When the starting assistance/charging process is
comple te: #
Firs t, re mo vethe jump lead/charging cable
from ear thpoint 3and the negative pole of
th e donor batter y,then from positive clamp
2 and the positive pole of the donor batter y.
Begin ea chtime with the contacts on your
ow nve hicle /rst. #
ATer removing the jump lead/charging cable,
close co ver1 of positive clamp 2.
Plug-in h
Plug-in h ybr
ybrid:
id:ifyo ur vehicle has been star ted
with starting assis tance, it may not be possible to
use the electric drive for appr oximately 30
minutes.
Fu rther information can be obtained at a quali/ed
specialist workshop. R R
eplacing t
eplacing t he 12 V batt
he 12 V batt ery
ery #
Obser vethe no tes on the 12 V battery
(/ page 361). 364
364
Breakdown assistance

Mercedes-Benz
recommends that you ha vethe
12 V battery replaced at a quali/ed specialist
wo rkshop, e.g. at a Mercedes-Benz Se rvice
Centre.
Obser vethefo llowing no tes if youwa nttoreplace
th e battery yourself:
R Alwaysre place a faulty battery with a battery
which meets the speci/c vehicle requ ire-
ments.
The vehicle is equipped with a 0eece batter y.
Fu llve hicle functionality is only guaranteed
with a 0eece batter y.Fo r saf etyre asons,
Mercedes-Benz recommends that you only
use batteries which ha vebeen tested and
appro vedfo ryo ur vehicle byMercedes-Benz.
R Use de tach able parts such as vent hoses,
elbow /ttings or term inal co vers from the bat-
te ry which is tobe replaced.
R Make sure that theve nt hose is alw ays con-
nected tothe original opening on the side of
th e batter y.
Fi t any existing or supplied cell caps.
Otherwise, gases or battery acid could
escape. R
Make sure that de tach able parts are recon-
nected in the same way. T T
o
o w
w -st
-st ar
arting or to
ting or towing away
wing away P
P
er
er mitt
mitt edto
ed towing met
wing met hods (non plug-in h
hods (non plug-in h ybr
ybrid)
id) P
P
er
er mitt
mitt edto
ed towing met
wing met hods
hods
Mercedes-Benz recommends transporting your
ve hicle in the case of a breakdown, rather than
to wing it away.
Fo rto wing, use a tow rope or tow bar with bo th
axles on thegr ound. Do not use tow bar systems. &
W
WARNING
ARNING Risk of accident when towing
with steering wheel lock
If th e steering wheel lock is engaged, you will
not be able tosteer theve hicle. #
When towing with a tow rope or tow bar,
alw ays switch on theve hicle. *
N
NOOTE
TE Damage totheve hicle due to tow-
ing awa y incor rectly #
Obser vethe inst ructions and no tes on
to wing away. V
V
ehicles wit
ehicles wit h manual tr
h manual tr ansmission
ansmission
Bo th axles on
th egr ound Ye
s, maximum 50 km at
50 km/h
Fr ont axle
ra ised Ye
s, maximum 50 km at
50 km/h
Re ar axle
ra ised Ye
s, maximum 50 km at
50 km/h V
V
ehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission
ansmission
Bo th axles on
th egr ound Ye
s, maximum 50 km at
50 km/h
Fr ont axle
ra ised Ye
s, maximum 50 km at
50 km/h
Re ar axle
ra ised Ye
s, maximum 50 km at
50 km/h Breakdown assis
tance
365
365

4MA
4MA
TIC v
TIC v ehicles
ehicles
Bo th axles on
th egr ound Ye
s, maximum 50 km at
50 km/h
Fr ont axle
ra ised No
Re ar axle
ra ised No T
T
o
o wing wit
wing wit h a r
h a raised axle:
aised axle: towing should be per-
fo rm ed byato wing compan y. Ov
Ov
er
ervie
vie w of per
w of per mitt
mittedto
ed towing met
wing met hods (plug-in
hods (plug-in
h
h ybr
ybr id)
id) Mercedes-Benz
recommends transporting your
ve hicle in the case of a breakdown, rather than
to wing it away. Fo
rto wing, use a tow rope or tow bar with bo th
axles on thegr ound. Do not use tow bar systems.
* N
NOOTE
TE Damage totheve hicle due to tow-
ing awa y incor rectly #
Obser vethe inst ructions and no tes on
to wing away. Obser
vethe information on towing and transport-
ing theve hicle in theve hicle Owner's Manual.
P
P er
er mitt
mitt edto
ed towing met
wing met hods
hods V
V
ehicle eq
ehicle eq uipment/to
uipment/to wing met
wing method
hod Bot
Bot
h axles on t
h axles on t hegr
he ground
ound F
F
r
ront axle r
ont axle r aised
aised R
R
ear axle r
ear axle r aised
aised
Plug-in hybrid vehicles Yes, maximum 50 km at 50 km/h Yes, maximum 50 km at 50 km/h Yes, maximum 50 km at 50 km/h
The steering wheel must be /xed in
th e centre position with a steering
wheel loc k. 366 366
Breakdown assistance

In
thefo llowing situations, only transporting the
ve hicle is permitted:
R the multifunction display is not working
or
R theá Towing not permitted See Owner's
Manual display message appears
Ex
Ex cep
cep tion:
tion: ifth eve hicle is located in a danger
zone, it can be reco vered from the danger zone
despite the display message or the display not
wo rking.
It must not be towe d fur ther than 50 m with bo th
axles on thegr ound. A towing speed of 10 km/h
must not be exceeded. Be yond these limits, only
transporting is permitted. T
T
o
o wing t
wing t he v
he vehicle wit
ehicle wit h bot
h both axles on t
h axles on t hegr
he ground
ound #
Obser vethe no tes on the permitted towing
me thods (/ page 365). #
Plug-in hybrid: obser vethe no tes on the per-
mitted towing me thods (/ page 366). #
Make sure that the battery is connected and
ch arge d. Obser
vethefo llowing points when the battery is
dischar ged:
R theve hicle cann otbe star ted
R the electric parking brake cannot be released
or applied
R V
Vehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: the
transmission cannot be shiTed toposition 005C
or 005D.
% V
Vehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: ifthe
transmission cannot be shiTed toposition 005C
or if the display does not show anything,
transport theve hicle (/ page 368). A towing
ve hicle with liTing equipment is requ ired for
ve hicle transpo rtation.
* NO
NOTE
TEDamage due to towing away at
ex cessively high speeds or over long dis-
ta nces The driv
etra in could be damaged when towing
at excessively high speeds or over long distan-
ces. #
Atowing speed of 50 km/h must not be
ex ceeded. #
Atowing dis tance of 50 km must not be
ex ceeded. &
W
WARNING
ARNING Risk of accident when towing a
ve hicle which is too heavy
If th eve hicle tobe tow- star ted or towe daway
is heavier than the permissible gross mass of
yo ur vehicle, thefo llowing situations can
occur:
R theto wing eye may become de tach ed.
R theve hicle/trailer combination may
swer veorove rturn. #
Before tow- starting or towing away,
ch eck if theve hicle tobe tow- star ted or
to we dawa yex ceeds the permissible
gr oss mass. If a
vehicle must be tow- star ted or towe dawa y,its
permissible gross mass must not exceed the per-
missible gross mass of theto wing vehicle. Breakdown assis
tance
367
367