2022 MERCEDES-BENZ B-CLASS HATCHBACK Owners Manual


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

Plug-in hybrid: t
he socket Oap is also locked and
unlocked. The socket Oap can be opened even if a
key is detected in the car.
The vehicle is not unlocked:
= if you have locked the vehicle using the key
= if you have locked the vehicle using KEYLESS-
GO Locking/unlocking the vehicle with KEYLESS-GO
Requirements:
= The k

ey is outside the vehicle.
= The distance between the key and the vehicle
does not exceed 1 m.
= The driver's door and the door on which the
door handle is used are closed.
* NOTE V
ehicle damage due to uninten-
tional opening of the tailgate =
when using an aut
omatic car wash
= when using a high pressure cleaner 
Deactivate the function of the key in
t

hese situations.
or 
Make sure that the key is at a minimum
dis

tance of 3 m away from the vehicle. Observe the notes:
= on w

ashing the vehicle in a car wash
(  page 352)
= on using a high pressure cleaner
( page 354) 
To unlock the vehicle: t
ouch the inner surface
of the door handle. 
To lock the vehicle: t
ouch sensor surface 1
or 2. 
Convenience closing: t
ouch recessed sensor
surface 2 until the closing process has been
completed. 88
Opening and closing

%
Further information on convenience closing
(  pag
e 99).
If you open the tailgate from outside, it is auto-
maticall
y unlocked. Problems with KEYLESS-GO, troubleshooting
You can no longer lock or unlock the vehicle using
KEYLESS-GO
P

ossible causes:
= The function of the key has been deactivated.
= The key battery is weak or discharged. 
Activate the function of the key ( pag
e 84).
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 vehicle and key checked at a quali-
Ned specialis

t workshop. There is interference from a powerful radio signal
sour

ce
Possible causes if the function of KEYLESS-GO is
impaired:
= high voltage power lines
= mobile phones
= electronic devices (notebooks, tablets)
= shielding due to 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. Activating/deactivating the automatic locking fea-
tur
e The vehicle is locked automatically when the vehi-
cle is switc

hed on and the wheels are turning
faster than walking pace. 
To activate: pr
ess and hold button 2 for
approximately Nve seconds until an acoustic
signal sounds. 
To deactivate: pr
ess and hold button 1 for
approximately Nve seconds until an acoustic
signal sounds.
The red indicator lamp on button 2 lights up
once t
he vehicle is locked. Opening and closing
89

In the following situations, there is a danger of
being loc
ked out when the function is activated:
= while the vehicle is being tow-started or
pushed
= if the vehicle is being tested on a roller dyna-
mometer Locking/unlocking the vehicle with the emer-
g

ency key Locking/unlocking the driver's door with the
emer

gency key
% If you wish to lock the vehicle entirely using
t
he emergency key, Nrst press the button for
locking from the inside while the driver's door
is open. Then proceed to lock the driver's
door using the emergency key. 
Remove the emergency key (  pag
e 85). 
Insert the emergency key as far as it will go
int
o opening 1 in the cover. 
Pull and hold the door handle. 
Pull the cover on the emergency key as
s

traight as possible away from the vehicle until
it releases. 
Release the door handle. 
To unlock: tur
n the emergency key anti-clock-
wise to position 1. 
To lock: tur
n the emergency key clockwise to
position 1. 
Carefully press the cover onto the lock cylin-
der until it eng

ages and is seated Nrmly.90
Opening and closing

Locking the front passenger door and rear doors

Insert a suitable object, e.g. the emergency
k ey, into opening 1 on the door lock. 
To lock the les-hand side of t
he vehicle: turn
the emergency key anti-clockwise as far as it
will go. 
To lock the right-hand side of the vehicle: tur
n
the emergency key clockwise as far as it will
go.
If the locked door is then closed, it can no longer
be opened fr
om the outside. Load compartment
Opening the tailgate
&
DANGER Risk of poisoning fr
om exhaust
gases
Combustion engines emit poisonous exhaust
g
ases, such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the tail-
gate is open when the engine is running, espe-
cially if the vehicle is in motion. 
Always switch oM t
he engine before
opening the tailgate. 
Never drive with the tailgate open. *
NOTE Damag
e to the tailgate caused by
obstacles above the vehicle The tailgate swings rearwards and upwards
when it is opened.

Make sure that there is suPcient space
behind and abo
ve the tailgate. 
Pull the tailgate handle. 
Vehicles with HANDS-FREE ACCESS: mak
e a
kicking movement with your foot below the
bumper ( page 94). Opening and closing
91

Vehicles with an EASY-PACK tailgate

Pull remote operating switch 1 until t he tail-
gate opens.
or 
Press and hold the p butt
on on the key.
If the tailgate is unlocked, pull the tailgate han-
dle and r
elease it again immediately. 
If the tailgate is stopped in an intermediate
position, pull it upw
ards. Release it as soon as
it begins to open.
If an obstacle obstructs the tailgate during the
aut
omatic opening process, blockage detection
will stop the tailgate. The automatic blockage
detection function is only an aid. It is not a substi-
tute for your attentiveness. Closing the tailgate
&
WARNING Risk of injur
y from unsecured
items in the vehicle
If objects, luggage or loads are not secured or
no
t secured suPciently, they could slip, tip
over or be thrown around and thereby hit vehi-
cle occupants.
There is a risk of injury, particularly in the
event of sudden braking or a sudden change
in direction. 
Always stow objects in such a way that
t

hey cannot be thrown around. 
Before the journey, secure objects, lug-
g

age or loads against slipping or tipping
over. Observe the notes on loading the vehicle.
Notes on closing the tailgate:
y
our vehicle is
equipped with automatic key recognition. If a key
belonging to the vehicle is detected in the vehicle,
the tailgate will not be locked.
Note that the tailgate will not be locked in the fol-
lowing situation:
= You have locked the vehicle and close the tail-
gate while a key belonging to the vehicle is
inside the vehicle.
and
= A second key belonging to the vehicle is not
detected outside the vehicle.
Automatic key recognition is only an aid and is not
a substitute for your attentiveness. 
Before locking, ensure that at least one key
belonging t

o the vehicle is outside the vehicle. 92
Opening and closing


To close the tailgate: pull t he tailgate down-
wards with the handle and let it drop into the
lock.
Vehicles with an EASY-PACK tailgate &
WARNING Risk of becoming tr
apped dur-
ing automatic closing of the tailgate
Body parts may become trapped. There may
be people in t
he closing area. 
Make sure that nobody is in the vicinity
of t
he closing area during the closing
process.
Use one of the following options to stop the
closing pr
ocess:
= Press the p button on the key.
= Press or pull the remote operating switch
on the driver's door.
= Press the closing or locking button on the
tailgate.
= Pull the tailgate handle. Vehicles with HANDS-FREE ACCESS: it is also
possible t

o stop the closing process by making a
kicking movement below the rear bumper. 
To close the tailgate: pull t
he tailgate down-
wards slightly. Release it as soon as it begins
to close. 
Switch on the power supply or the vehicle. 
Push remote operating switch 1 until t
he tail-
gate is fully closed. 
Press closing button 1 on t
he tailgate. Opening and closing
93