MERCEDES-BENZ B-CLASS HATCHBACK 2022 Manual Online

and the PASSENGER AIR BAG OFF indicator
lam
p is oM, the front passenger airbag can
deploy in the event of an accident.
The child could be struck by the airbag. 
Always ensure that the front passenger
airbag is disabled. The P

ASSENGER AIR
BAG OFF indicator lamp must be lit. 
NEVER use a rearward-facing child
r
estraint system on a seat with an ENA-
BLED FRONT AIRBAG. This can result in
the DEATH of or SERIOUS INJURY to the
CHILD. Observe the
speciNc ins
tructions for the rear-
ward-facing and forward-facing child restraint sys-
tems (  page 78). Warning notice on the front passenger sun visor
Alw
ays observe the status of the front passenger
airbag on the PASSENGER AIR BAG OFF indicator
lamp:
= If it is absolutely necessary to Nt a child
restraint system to the front passenger seat,
always observe the information on automatic
front passenger airbag shutoM ( page 56).
= When using a rearward-facing child restraint
system on the front passenger seat, the front
passenger airbag must always be disabled.
This is only the case if the PASSENGER AIR
BAG OFF indicator lamp is lit continuously
( page 58). =
If t
he PASSENGER AIR BAG OFF indicator
lamp is oM, the front passenger airbag is ena-
bled. The front passenger airbag may deploy
during an accident.
Securing the child restraint system with the seat
belt on the front passenger seat
When Ntting a belt-secured child restraint system
on the front passenger seat, always observe the
following:
s Observe the notes on rearward-facing and
f
orward-facing child restraint systems on the
front passenger seat (  page 77).
s Observe the child restraint system manufac-
tur

er's installation and operating instructions.
s For a child restraint system in the "Universal"
or "Semi-U
niversal" category, make sure that
the system has been approved for the vehicle
seat.
Observe the notes under "Suitability of seats
for attaching belt-secured child restraint sys-
tems" (  page 74). 78
Occupant safety

s
When using a forward-facing child restraint
sy
stem in weight category I: remove the head
restraint from the respective seat, if possible.
Aser the child restraint system has been
removed, replace the head restraint immedi-
ately and adjust all head restraints correctly.
s The backrest of the forward-facing child
r

estraint system must, as far as possible, be
resting on the seat backrest of the front
passenger seat.
s If the head restraint of the child seat cannot
be full

y extended when it is installed in the
vehicle, this will result in restrictions on the
maximum size setting for child restraint sys-
tems in weight category II or III.
Contact with the roof when the head
restraint is fully extended and locked in place
will not result in any restrictions on use.
s The child restraint system must not be put
under s
train between the roof and the seat
cushion and/or be Ntted facing the wrong
direction. s
The child restraint system must not be put
under s
train by the head restraint. Adjust the
head restraints as appropriate.
s Never place objects (e.g. cushions) under or
behind t

he child restraint system. &
WARNING Risk of injur
y or death due to
objects between the seat surface and the
child restraint system
Objects between the seat surface and the
c
hild restraint system could aMect the function
of the automatic front passenger airbag shut-
oM. 
Do not place any objects between the
seat sur

face and the child restraint sys-
tem. 
Always make sure that the child restraint
sy
stem is correctly Ntted. 
Set the front passenger seat as far back as
possible and mo
ve the seat into the highest
position if possible. 
Adjust the seat cushion inclination so that the
fr
ont edge of the seat cushion is in the highest position and the rear edge of the seat cushion
is in t
he lowest position. 
Set the seat backrest to the most vertical
position possible. 
Install the child restraint system.
The entir
e base of the child restraint system
must always rest on the sitting surface of the
front passenger seat. 
Always make sure that the shoulder belt strap
is cor
rectly routed from the seat belt outlet of
the vehicle to the shoulder belt guide on the
child restraint system.
The shoulder belt strap must be routed for-
wards and downwards from the seat belt out-
let. 
If necessary, adjust the front passenger seat
accor
dingly. Occupant safety
79

Child safety locks
Activating or deactivating the child safety lock for
t
he rear doors &
WARNING Risk of accident and injur
y due
to leaving children unattended in the vehi-
cle
If children are les unatt
ended in the vehicle,
they could, in particular:
= open doors, thereby endangering other
persons or road users.
= get out and be struck by oncoming traPc.
= operate vehicle equipment and become
trapped, for example.
In addition, the children could also set the
vehicle in motion by, for example:
= releasing the parking brake.
= changing the transmission position.
= starting the vehicle. 
Never leave children unattended in the
v
ehicle. 
When leaving the vehicle, always take the
k
ey with you and lock the vehicle. 
Keep the vehicle key out of the reach of
c
hildren. &
WARNING Risk of f
atal injury due to expo-
sure to extreme heat or cold in the vehicle
If persons, particularly children, are subjected
t
o prolonged exposure to intense heat or cold,
there is a risk of severe injury or even death. 
Never leave persons, particularly chil-
dr
en, unattended in the vehicle. &
WARNING Risk of accident and injur
y due
to children les unattended in the vehicle
If children are travelling in the vehicle, they
could, in par
ticular:
= open doors, thereby endangering other
persons or road users.
= get out and be struck by oncoming traPc.
= operate vehicle equipment and become
trapped, for example. 
Always activate the installed child safety
loc

ks if children are travelling in the vehi-
cle. 
Never leave children unattended in the
v
ehicle. 
When leaving the vehicle, always take the
k
ey with you and lock the vehicle. Vehicles for the United Kingdom: observe the
im
portant safety notes in the "Notes on the addi-
tional door lock" section.
There are child safety locks for the rear doors and
the rear side windows.
The child safety lock on the rear doors secures
eac
h door separately. The doors can no longer be
opened from the inside. 80
Occupant safety


Press the lever in direction 1 (activ ate) or 2
(deactivate). 
Make sure that the child safety locks are work-
ing pr
operly. Activating and deactivating the child safety lock
f
or the rear side windows 
To activate/deactivate: pr
ess button 2.
The rear side window can be opened or closed
in the following cases:
= indicator lamp 1 is lit: via the switch on
the driver's door =
indicat
or lamp 1 is oM: via the switch on
the corresponding rear door or driver's
door Notes on pets in the vehicle
&
WARNING Risk of accident and injur
y due
to animals les unsecured or unattended in
the vehicle
If you leave animals in the vehicle unattended
or unsecur
ed, they could press buttons or
switches, for instance.
An animal may:
= activate vehicle equipment and become
trapped, for example
= switch systems on or oM and endanger
other road users
Unsecured animals may be thrown about the
vehicle in the event of an accident, or sudden
steering and braking manoeuvres, and injure
vehicle occupants. Occupant safety
81


Never leave animals unattended in the
v
ehicle. 
Always correctly secure animals while
dr

iving, e.g. using a suitable animal car-
rier. 82
Occupant safety

Key
Overview of key functions
&
WARNING Risk of accident and injur y due
to leaving children unattended in the vehi-
cle
If children are les unatt
ended in the vehicle,
they could, in particular:
= open doors, thereby endangering other
persons or road users.
= get out and be struck by oncoming traPc.
= operate vehicle equipment and become
trapped, for example.
In addition, the children could also set the
vehicle in motion by, for example:
= releasing the parking brake.
= changing the transmission position.
= starting the vehicle. 
Never leave children unattended in the
v
ehicle. 
When leaving the vehicle, always take the
k
ey with you and lock the vehicle. 
Keep the vehicle key out of the reach of
c
hildren. *
NOTE Damag
e to the key caused by mag-
netic Nelds 
Keep the key away from strong magnetic
Nelds. Vehicle key
1 To lock
2 Indicator lamp 3
Unlocks
4 Opens/closes the tailgate
% If indicator lamp 2 does no
t light up aser
pressing the Ü or ß button, the battery
is weak or possibly discharged. Replace the
battery as soon as possible.
Replace the key battery ( pag
e 85).
The key locks and unlocks the following compo-
nents:
= doors
= Fuel Nller Oap
= Socket Oap (plug-in hybrid)
= tailgate
If the vehicle is not opened within approximately
40 seconds aser unlocking, it locks again. Anti-
thes protection is primed again.
Do not keep the key together with electronic devi-
ces or metal objects. This can aMect the key's
functionality. Opening and closing
83

Activating/deactivating the acoustic locking
v eriN-
cation signal Multimedia system:
4 © 5
Settings 5
Vehicle 
Activate or deactivate Acoustic lock.
% Please observe:
The select

ed setting for the acoustic locking
veriNcation signal must comply with the rele-
vant national road and traPc regulations. In
some countries, including Germany, using the
acoustic locking veriNcation signal is forbid-
den by traPc laws (in accordance with g16
Para. 1 and g30 Para. 1 of the German
national road traPc regulations). The driver of
the vehicle must comply with these regula-
tions. In countries where the use of this func-
tion is forbidden, this function is not activated
in the vehicle and must not be activated. Changing the unlocking settings
Possible unlocking functions of the key:
= Centr

al unlocking
= Unlocking the driver's door and fuel Nller Oap =
Plug-in h
ybrid: unlocking the driver's door and
fuel Nller Oap/socket Oap 
To switch between settings: pr
ess the Ü
and ß buttons simultaneously for approx-
imately six seconds until the indicator lamp
Oashes twice.
Options if the unlocking function for the driver's
door and fuel Nller Oap has been select

ed:
= To unlock the vehicle centrally: press the
Ü button twice.
= Vehicles with KEYLESS-GO: if you touch the
inner surface of the door handle on the driv-
er's door, only the driver's door and the fuel
Nller Oap are unlocked.
Options if the unlocking function for the driver's
door and fuel Nller Oap/socket Oap has been
selected (plug-in-hybrid):
= To unlock the vehicle centrally: press the
Ü button twice.
= Vehicles with KEYLESS-GO: if you touch the
inner surface of the door handle on the driv-
er's door, only the driver's door and the fuel
Nller Oap/socket Oap are unlocked. Deactivating the function of the key
Vehicles with KEYLESS-GO:
if y
ou deactivate the
function of the key, the KEYLESS-GO functions are
also deactivated. Access or drive authorization by
KEYLESS-GO is then no longer possible with that
particular key. Activate the function of the key so
that all its functions will again be available.
You can also deactivate the function of the key to
reduce the energy consumption of the key if you
do not use the vehicle or a key for an extended
period of time. 
Deactivate: Pr
ess and hold the key button
ß. 
With the key button ß pr
essed, immedi-
ately press key button Ü twice in quick
succession.
The indicator light of the key lights up once
brieOy and once for a long time. 
To activate: pr
ess any button on the key.
% When the vehicle is started with the key in the
s
towage compartment of the centre console,
the function of the key is automatically activa-
ted ( page 174). 84
Opening and closing

Removing/inserting the emergency key
Removing the emergency key

Press release button 1.
Emer gency key 2 is pushed out slightly. 
Pull out emergency key 2 until it eng
ages in
the intermediate position. 
Press release button 1 ag
ain and fully
remove emergency key 2.
Inserting the emergency key 
Press release button 1.
Insert emergency key 2 t
o the intermediate
position or fully until it engages. %
You can use the intermediate position of
emer

gency key 2 to attach the key to a key
ring. Replacing the key battery
&
DANGER Risk of f
atal injuries due to swal-
lowing batteries
Batteries contain toxic and corrosive substan-
ces. Sw
allowing batteries may cause severe
internal burns to occur within two hours.
There is a risk of fatal injury. 
Keep batteries out of the reach of chil-
dr

en. 
If the cap and/or the battery compart-
ment does no

t close securely, do not use
the key any longer and keep it out of the
reach of children. 
If batteries are swallowed, seek medical
att

ention immediately. +
ENVIRONMENTAL NOTE
En
vironmental
damage due to improper disposal of bat-
teries Batteries contain pollutants. It is
illeg

al to dispose of them with the household
rubbish. 
Dispose of batteries in an
en

vironmentally responsible manner.
Take discharged batteries to a qualiNed
specialist workshop or to a collection
point for used batteries. Requirements:
= Y

ou require a CR 2032 3 V cell battery.
Mercedes-Benz recommends that you have the
battery replaced at a qualiNed specialist work-
shop. 
Remove the emergency key (  pag
e 85). Opening and closing
85


Press release knob 2 do wn fully and slide
cover 1 in the direction of the arrow. 
Fold out cover 1 in t
he direction of the arrow
and remove. 
Remove battery compartment 3 and t
ake
out the discharged battery. 
Insert the new battery into battery compart-
ment 3. Obser

ve the positive pole marking in
the battery compartment and on the battery
when doing this. 
Push in battery compartment 3.
Re-attach cover 1 and push it until it
eng
ages. Problems with the key, troubleshooting
You can no longer lock or unlock the vehicle
P
ossible causes:
= The key battery is weak or discharged. 
Check the battery using the indicator lamp
( pag

e 83). 
Replace the key battery, if necessary
( pag
e 85). 
Use the replacement key. 
Use the emergency key to lock or unlock
( pag

e 90). 
Have the key checked at a q
ualiNed specialist
workshop.
There is interference from a powerful radio signal
sour
ce
Possible causes if the function of the key is
impaired:
= high voltage power lines
= mobile phones
= electronic devices (notebooks, tablets) =
shielding due t
o metal objects or induction
loops for electrical gate systems or automatic
barriers 
Make sure that there is suPcient dis
tance
between the key and the potential source of
interference.
You have lost a key 
Have the key deactivated at a q
ualiNed spe-
cialist workshop. 
If necessary, have the mechanical lock
r
eplaced as well. Doors
Notes on the additional door lock
The additional door lock is only available for vehi-
cles f
or the United Kingdom. 86
Opening and closing

&
WARNING Risk of injur y to persons inside
the vehicle when the additional door lock
is activated
If the additional door lock is activated, the
door
s can no longer be opened from the
inside. 
Never leave persons, in particular chil-
dr

en, unattended in the vehicle. 
If there are persons in the vehicle, do not
activ
ate the additional door lock. The additional door lock is automatically activated
in t

he following situations:
= The vehicle is locked using the key.
= The vehicle is locked using KEYLESS-GO.
If the vehicle has been locked via Mercedes me
connect, the additional door lock is not activated
(  page 325).
If the additional door lock is activated, the doors
cannot be opened from the inside.
% Aser loc
king you can issue a signal with the
horn. You can prevent the additional door lock from
being activ
ated by deactivating interior protection
before locking the vehicle ( page 106). Unlocking/opening the doors from the inside

United Kingdom only: obser
ve the notes on
the additional door lock ( page 86). 
Pull door handle 1. Centrally locking and unlocking the vehicle from
t
he inside 
To unlock: pr
ess 1 button. 
To lock: pr
ess button 2.
The red indicator lamp on button 2 lights up
once the vehicle is locked.
This does not lock or unlock the fuel Nller Oap. Opening and closing
87