warning MERCEDES-BENZ B-CLASS HATCHBACK 2021 Service Manual

Obser
vethe no tes when opening (/ page 89)
and closing (/ page 90)theta ilgate.
% Twowa rning tones sound when theta ilgate is
opening or closing. &
W WARNING ARNING Risk of burns caused bya hot
ex haust system
The vehicle exhaust system can become very
hot. If you use HANDS-FREE ACCESS, you
could burn yourself bytouching theex haust
system. #
Always ensu rethat you only make a kic k-
ing mo vement within the de tection range
of the sensors. *
N
NO OTE
TE Vehicle damage due touninten-
tional opening of theta ilgate R
when using an automatic car wash
R when using a high pressure cleaner #
Deactivate the function of theke y in
th ese situations.
or #
Make sure that theke y is at a minimum
dis tance of 3 m away from theve hicle. When making
the kicking mo vement, make sure
th at you are standing /rmly on thegr ound. Yo u
could otherwise lose your balance, e.g. on ice.
Obser vethefo llowing no tes:
R The key is behind theve hicle.
R Stand at least 30 cm away from theve hicle
while per form ing the kicking mo vement.
R Do not come into contact with the bumper
while making the kicking mo vement.
R Do not car ryout the kicking mo vement too
slo wly.
R The kicking mo vement must be towa rdsthe
ve hicle and back again. 1
Detection range of the sensors
If se veral consecutive kicking mo vements are not
successful, waitte n seconds.
Syst
Syst em limits
em limits
The system may be impai red or may not function
in thefo llowing cases:
R The sensors are dirty, e.g. due toroad salt or
sno w.
R The kicking mo vement is made using a pros-
th etic leg. Opening and closing
93
93

When
theve hicle is switched o., you can con-
tinue tooperate the side windo ws.
This function is available for around four minutes
or until a front door is opened.
A A ut
ut omatic rev
omatic rever
ersing function of t
sing function of t he side windows
he side wind ows
If an obs tacle impedes a side window during the
closing process, the side window will open again
automaticall y.The automatic reve rsing function is
only an aid and is not a substitute foryo ur atten-
tiveness. #
During the closing process, make sure that no
body parts are in the closing area. &
W
WARNING
ARNING Risk of becoming trapped
despite there being reve rsing pr otection
on the side window
The reve rsing function does not react:
R tosoT, light and thin objects, e.g. /n gers.
R during resetting.
The reve rsing function cannot pr event some-
one from becoming trapped in these situa-
tions. #
During the closing process, make sure
th at no body parts are in the closing
area. #
If someone becomes trapped, press the
0062 button toopen the side window
again. A
A
ut
ut omatic function of t
omatic function of t he side windows
he side wind ows In
thefo llowing cases, the side windo wswill be
closed automatically when theve hicle is switched
o.:
R if it starts torain
Ra in is de tected byara in sensor on the wind-
screen.
R inextreme temp eratures
R aTer a cer tain time (depending on the on-
board electrical system voltage)
R ifth ere is a malfunction in the po wer supply
The side windo wswill be closed as far as theve n-
tilation position. V
V ehicles wit
ehicles wit h a panor
h a panorama sliding sunr
ama sliding sunroof: oof:the side
windo wswill be closed comple tely ifth e sliding
sunroof is open.
If th e side windo wsare obstructed during auto-
matic closing, the side window concerned will
open again slightl y.ATer an other automatic clos-
ing process, the automatic function forth e sun-
ro of and side windo wsmay be deactivated. The
automatic function will be active again the next
time theve hicle is star ted. Conv Conv
enience opening (v
enience opening (v entilating t
entilating the v
he vehicle
ehicle
bef
bef or
ore st
e st ar
arting a jour
ting a jour ne
ney)
y) &
W
WARNING
ARNING Risk of entrapment when open-
ing a side window
When opening a side windo w,parts of the
body could be dr awn in or become trapped
between the side window and window frame. #
When opening, make sure that nobody is
to uching the side windo w. #
Release the button immediately if some-
body becomes trapped. 96
96
Opening and closing

R
R
eq
eq uir
uir ements:
ements:
R The key is in the immediate vicinity of theve hi-
cle. #
Press and hold theÜ button on thekey.
The following functions are per form ed:
R The vehicle is unloc ked.
R The side windo wsare opened.
R The panoramic sliding roof is opened.
R The seat ventilation of the driver's seat is
switched on.
% Ifth ero ller sunblind of the panoramic sliding
sunroof is closed, thero ller sunblind is
opened /rst. #
T
To int
o int err
errup
upt conv
t conv enience opening:
enience opening: release the
Ü button. #
T
To continue conv
o continue conv enience opening:
enience opening: press and
hold theÜ button again. Conv
Conv
enience closing (closing t
enience closing (closing t he v
he vehicle fr
ehicle fr om out-
om out-
side)
side) &
W
WARNING
ARNING Risk of entrapment due tonot
paying attention during con venience clos-
ing
When the con venience closing feature is oper-
ating, parts of the body could become trapped
in the closing area of the side window and the
sliding sunroof. #
When the con venience closing feature is
operating, moni torth e entire closing
process and make sure that no body
parts are in the closing area. R
R
eq
eq uir
uir ements:
ements:
R The key is in the immediate vicinity of theve hi-
cle. #
Press and hold theß button on thekey.
The following functions are per form ed:
R The vehicle is loc ked.
R The side windo wsare closed.
R The pano ramic sliding roof is closed. #
T
To int
o int err
errup
upt conv
t conv enience closing:
enience closing: release the
ß button. #
T
To continue conv
o continue conv enience closing:
enience closing: press and
hold theß button again.
% Con venience closing also functions with KEY-
LESS-GO (/ page 86). R
R
esol
esol ving pr
ving pr oblems wit
oblems wit h t
h the side wind ows
he side wind ows &
W
WARNI NG
ARNI NGRisk of becoming trapped or
fata lly injured if reve rsing pr otection is not
activated
If yo u close a side window again immediately
aTer it has been bloc ked, the side window will
close with increased or maximum forc e. The
re ve rsing function is then not active and body
parts may become trapped. #
Make sure that no parts of the body are
in the closing area. #
Tostop the closing process, release the
button or press the button again to
re open the side windo w. Opening and closing
97
97

A side windo
A side windo
w canno
w canno t be closed and y
t be closed and y ou cannot
ou cannot
see t
see t he cause.
he cause. #
Che cktosee whe ther any objects are in the
wind owguide. #
Adjust the side windo ws.
A
A djus
djus ting t
ting t he side window
he side window s
s
If a side window is obstructed during closing and
re opens again immediatel y:#
Immediately aTer this, pull and hold the cor re-
sponding button again until the side window
has closed and hold the button for at least one
more second (re-adjustment).
The side window will be closed without the
automatic reve rsing function.
If th e side window is obstructed again and
re opens again immediatel y:#
Immediately aTer this, pull and hold the cor re-
sponding button again until the side window
has closed and hold the button for at least one
more second (follo w-up adjustment).
The side window will be closed without the
automatic reve rsing function. The side window The side window
s canno
s cannot be opened or closed
t be opened or closed
using t
using t he conv
he conv enience opening f
enience opening f eatur
eatur e.
e.
Po ssible causes:
R The key battery is weak or dischar ged. #
Check the battery using the indicator lamp
(/ page 81). #
Replace theke y batter y,if necessary
(/ page 83). Sliding sunr
Sliding sunr
oof
oof Opening and closing t
Opening and closing t
he sliding sunr
he sliding sunroof
oof %
The term "sliding sunroof" also refers to the
panorama sliding sunroof. &
W
WARNING
ARNING Risk of becoming trapped when
th e sliding sunroof is being opened and
closed
Body parts may become trapped in thera nge
of mo vement. #
During opening and closing, make sure
th at no body parts are in thera nge of
mo vement. #
Release the button immediately if some-
body becomes trapped.
or #
Brie0y press the button in any direction
during automatic operation.
The opening or closing process will be
stopped. &
W WARNING
ARNING Risk of entrapment if the slid-
ing sunroof is operated bychildren
Children operating the sliding sunroof could
get caught in the moving parts, particular lyif
unattended. #
Never lea vechildren unattended in the
ve hicle. #
When leaving theve hicle, alw aysta ke the
ke y with you and lock theve hicle. 98
98
Opening and closing

1
Raise
2 Open
3 Close/lo wer
Use the0057 button tooperate the panorama
sliding sunroof and thero ller sunblind.
The panorama sliding sunroof can be operated
only when thero ller sunblind is open. #
Check whe ther the sliding sunroof can be
ra ised or opened when a roof luggage rack is
/t ted. #
T
T o st o st ar
art aut
t aut omatic oper
omatic oper ation:
ation:pressthe0057
button be yond the point of resis tance or pull
and release it. #
T
T o int
o int err
errup
upt aut
t aut omatic oper
omatic oper ation:
ation:brie0y press
th e0057 button in any direction.
The opening/closing process will be stopped.
A
A ut
ut omatic rev
omatic rever
ersing function of t
sing function of t he sliding sun-
he sliding sun-
r
r oof
oof
If an obstacle obstructs the sliding sunroof during
th e closing process, the sliding sunroof will open
again automaticall y.The automatic reve rsing func-
tion is only an aid and is not a substitute foryo ur
attentiveness. #
During the closing process, make sure that no
body parts are in the closing area. &
W
WARNING
ARNING Risk of becoming trapped
despite there ve rsing function being active
In particular, there ve rsing function does not
re act:
R tosoT, light and thin objects, e.g. /n gers.
R towa rdsth e end of the closing procedure.
R during resetting. #
During the closing process, make sure
th at no body parts are in the closing
area. #
Release the button immediately if some-
body becomes trapped.
or #
Brie0y press the button in any direction
during automatic operation.
The closing process will be stopped. A A
ut
ut omatic rev
omatic rever
ersing function of t
sing function of t he r
he roller sunblind
oller sunblind
If an obstacle obstructs thero ller sunblind during
th e closing process, thero ller sunblind will open
again automaticall y.The automatic reve rsing func-
tion is only an aid and is not a substitute foryo ur
attentiveness. 100
100
Opening and closing

R
R
ectifying pr
ectifying pr oblems wit
oblems with t
h the sliding sunr
he sliding sunr oof
oof &
W
WARNING
ARNING Risk of becoming trapped or
fata l injuries when the sliding sunroof is
closed again
If th e sliding sunroof is closed again immedi-
ately aTer it has been bloc ked or reset, it will
close with increased forc e. #
Make sure that no parts of the body are
in the closing area. #
Release the button immediately if some-
body becomes trapped.
or #
Brie0y press the button in any direction
during the automatic closing process.
The closing process will be stopped. The sliding sunr
The sliding sunr
oof canno
oof cannot be closed and y
t be closed and y ou can-
ou can-
no
no t see t
t see t he cause.
he cause.
% The term "sliding sunroof" also refers to the
panorama sliding sunroof.
If th e sliding sunroof is obstructed during closing
and reopens again slightl y: #
Immediately aTer automatic reve rsing, pull
and hold the0057 button down again tothe
point of resis tance until the sliding sunroof is
closed.
The sliding sunroof will be closed with
increased forc e.
If th e sliding sunroof is obstructed again and
opens again slightl y: #
Repeat the pr evious step.
The sliding sunroof will be closed again with
increased forc e.
V V ehicles wit
ehicles wit h a panor
h a panorama sliding sunr
ama sliding sunr oof: t
oof: the slid-
he slid-
ing sunr
ing sunr oof or t
oof or the r
he roller sunblind is no
oller sunblind is no t oper
t operating
ating
smoot
smoot hly
hly.
. #
Reset the sliding sunroof and thero ller sun-
blind.
R
R ese
ese tting t
tting t he sliding sunr
he sliding sunr oof and t
oof and the r
he roller sun-
oller sun-
blind
blind #
Pull and hold the0057 button little bylittle
until the sliding sunroof is fully closed. #
Pull and hold the0057 button little bylittle
until thero ller sunblind is fully closed. #
Use automatic operation tofully open and
th en close the sliding sunroof. Anti-t
Anti-theT
heTprot
pr otection
ection F
F
unction of t
unction of t he immobiliser
he immobiliser The immobiliser pr
events your vehicle from being
star ted without the cor rect key.
The immobiliser is automatically activated when
th eve hicle is switched o., and deactivated when
th eve hicle is switched on. A A
T
TA
A (Anti-
(Anti- TheT
TheT Alar
Alarm syst
m syst em)
em) F
F
unction of t
unction of t heAT
he ATA systA syst em
em
If th eATA system is primed, a visual and audible
alarm is triggered in thefo llowing situations:
R when a door is opened
R when theta ilgate is opened
R when the bonnet is opened
R when interior pr otection is triggered
(/ page 104) 102
102
Opening and closing

N
N
o
ot
tes on t
es on t he corr
he corr ect dr
ect driv
iver's seat position
er's seat position &
W
WARNING
ARNING Risk of accident due toadjust-
ing theve hicle settings while theve hicle is
in motion
Yo u could lose control of theve hicle in thefo l-
lowing situations in particular:
R ifyo u adjust the driver's seat, the head
re straint, the steering wheel or the mir ror
while theve hicle is in motion
R ifyo ufa sten your seat belt while theve hi-
cle is in motion #
Before starting theve hicle: in particular,
adjust the driver's seat, head restraint,
stee ring wheel and mir ror,and fasten
yo ur seat belt. Ensure
thefo llowing when adjusting the steering
wheel 1, seat belt 2and driver's seat 3:
R You are sitting as farawa y from the driver's
airbag as possible, taking thefo llowing points
into consideration:
R You are sitting in an upright position
R Your thighs are slightly suppor tedby the seat
cushion R
Your legs are not fully extended and you can
depress the pedals proper ly
R The back of your head is suppor ted at eye
le ve lby the centre of the head restraint
R You can hold the steering wheel with your
arms slightly bent
R You can mo veyour legs freely
R You can see all the displa yson the inst rument
cluster clear ly
R You ha vea good overview of the tra1c condi-
tions
R Your seat belt sits snugly against your body
and passes across the centre of your shoulder
and across your hips in the pelvic area Seats and st
owing
105
105

Seats
Seats
A
A
djus
djusting t ting t he fr
he front seat mec
ont seat mec hanicall
hanicall y (wit
y (without
hout
Seat Comf
Seat Comf or
ort P
t P ack
ack ag
age)
e) &
W
WARNING
ARNING Risk of becoming trapped if the
seats are adjusted bychildren
Children could become trapped if they adjust
th e seats, particular lywhen unat tended. #
When leaving theve hicle, alw aysta ke the
ke y with you and lock theve hicle. #
Never lea vechildren unattended in the
ve hicle. &
W
WARNING
ARNING Risk of becoming trapped dur-
ing seat adjustment
When you adjust a seat, you or other vehicle
occupants could become trapped, e.g. on the
seat guide rail. #
Make sure when adjusting a seat that no
one has any body parts in the sweep of
th e seat. Obser
vethe saf ety no tes on "Airbags" and "Chil-
dren in theve hicle". &
W
WARNING
ARNING Risk of accident due tothe
driver's seat not being engaged
The driver's seat may mo veunexpectedly
while driving.
This could cause youto lose control of the
ve hicle. #
Always make sure that the driver's seat
is engaged before starting theve hicle. &
W WARNING
ARNING Risk of accident due toadjust-
ing theve hicle settings while theve hicle is
in motion
Yo u could lose control of theve hicle in thefo l-
lowing situations in particular:
R ifyo u adjust the driver's seat, the head
re straint, the steering wheel or the mir ror
while theve hicle is in motion
R ifyo ufa sten your seat belt while theve hi-
cle is in motion #
Before starting theve hicle: in particular,
adjust the driver's seat, head restraint,
stee ring wheel and mir ror,and fasten
yo ur seat belt. &
W
WARNING
ARNING Risk of becoming trapped if the
seat height is adjusted carelessly
If yo u adjust the seat height carelessl y,yo u or
ot her vehicle occupants could be trapped and
th ereby injured.
Children in particular could accidentally press
th e electrical seat adjustment buttons and
become trapped. #
While moving the seats, make sure that
hands or other body parts do not get
under the le ver assembly ofthe seat
adjustment system. 106 106
Seats and st
owing

&
W
W ARNI NG
ARNI NGRisk of injury due tohead
re straints not being /tted or being adjus-
te d incor rectly
If head restraints ha venot been installed or
ha ve not been adjusted cor rectl y,there is an
increased risk of injury in the head and neck
area, e.g. in theeve nt of an accident or when
braking. #
Always drive with the head restraints /t-
te d. #
Before driving o., make sure forev ery
ve hicle occupant that the centre of the
head restraint supports the back of the
head at about eye le vel. Do not inter
change the head restraints of the
front and rear seats. Otherwise, you will not be
able toadjust the height and angle of the head
re straints co rrectl y.
Ad just the head restraint fore -and-aT position so
th at it is as close as possible tothe back of your
head. &
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. &
W
WARNING
ARNING Risk of injury due toexcessive
st ra in on thegr ab handle
If yo u apply your full body weight tothegr ab
handle or pull it abruptl y,thegr ab handle may
be damaged or become loose from its anchor-
age. #
Use thegr ab handles only tostabilise
th e seating position or toassist in get-
ting in and out of the seat. &
W WARNING
ARNING Risk of injury or death due 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. Seats and st
owing
107
107

A
A
djus
djus ting t
ting t he fr
he front seat electr
ont seat electr ically
ically 1
Seat backrest inclination
2 Seat height
3 Seat cushion inclination
4 Seat fore -and-aT position #
Save the settings with the memory function
(/ page 118). A
A
djus
djus ting t
ting t he 4-wa
he 4-wa y lumbar support
y lumbar support 1
Higher
2 SoTer
3 Lower
4 Firm er #
Use buttons 1to4 toadjust the contour of
th e backrest. A
A
djus
djus ting r
ting r ear seats mec
ear seats mec hanically
hanically &
W
WARNING
ARNING Risk of becoming trapped when
adjusting the seats
When you adjust a seat, you may trap yourself
or a vehicle occupant. #
When adjusting a seat, make sure that
no one has any body parts in the sweep
of the seat. &
W
WARNING
ARNING Risk of accident if the seat and
seat backrest are not engaged
The seat and seat backrest can fold forw ards.
There is a risk of thefo llowing, in particular:
R The vehicle occupant may be pressed
against the seat belt. The seat belt cannot
pr otect as intended and could cause addi-
tional injur y.
R Ach ild restraint system will no longer be
prope rly suppor ted or positioned and will
no longer ful/l its function as intended. Seats and st
owing
109
109