MERCEDES-BENZ B-CLASS HATCHBACK 2022 Owners Manual

Requirements:
= The fuel t
ank is at least Õ full.
Set the desired temperature using the

To guarantee the Oo
w of fresh air through the air
vents into the vehicle interior, note the following:
= Always keep the vents and ventilation grilles in
the vehicle interior clear.
= Keep the air inlet free of residue build-up
( page 352). 
To open or close: hold t
he centre of air
vent 1 and turn it to the les (open) or right
(closed) as far as it will go. 
To set the airOo
w direction: hold the centre of
air vent 1 and move it up or down or to the
les or right. Adjusting the rear air vents

To open or close: hold t
he centre of air
vent 1 and turn it to the les or right as far as
it will go. 
To set the airOo
w direction: hold the centre of
air vent 1 and move it up or down or to the
les or right. Climate control
169

Driving
Notes on plug-in hybrids
Notes on plug-in hybrid operation
&
WARNING Risk of c hemical burns and poi-
soning from damaged high-voltage battery
If the housing of the high-voltage battery has
been damag
ed, electrolyte and gases may
leak out. 
Avoid contact with the skin, eyes or
clo

thing. 
Immediately rinse electrolyte splashes
oM wit

h water and seek medical atten-
tion straight away. &
DANGER Risk of Nr
e and explosion from
excessive internal pressure of the high-
voltage battery
In the event of a vehicle Nr
e, Oammable gas
can escape and ignite. 
Stop the charging process immediately
in case of unusual odour

s, smoke or
burn marks. 
Leave the danger zone immediately.
Secur

e the danger zone at a suPcient
distance. 
Call the Nr
e service. The hybrid system combines a combustion engine
wit
h an electric motor.
Characteristics when the vehicle is at a standstill: = The combustion engine is generally switched
oM.
= Idle speed occurs only in certain instances.
Characteristics when the vehicle is started: = If the high-voltage battery is suPciently
charged, the vehicle can be started with the
electric drive system without the combustion
engine (noiseless start).
= If the high-voltage battery for the electric drive
system is not suPciently charged or the vehi-
cle conditions for a silent start are not met, the vehicle will start with the combustion
engine.
% Depending on the system, it may be that even
t
hough the high-voltage battery is charged,
electric mode has restricted or no availability.
Once the combustion engine has been oper-
ated for long enough, electric mode will be
again available without restriction.
% To start the combustion engine, the high-volt-
ag

e battery can be used as a starter battery.
Characteristics with moderate power output
r
equests:
= The combustion engine is switched oM as
osen as possible during the journey.
= The vehicle can, depending on the drive pro-
gram selected and the state of charge of the
high-voltage battery, be accelerated electri-
cally up to speeds of approximately
140 km/h.
Characteristics with high power output requests:
= The electric motor supports the combustion
engine (boost eMect), e.g. when you pull away
or accelerate. 170
Driving and parking

=
The high-v oltage battery is discharging.
Characteristics when the accelerator pedal is
released during the journey: = The electric motor will be operated as an alter-
nator when in overrun mode and during brak-
ing.
= The high-voltage battery is charging.
Notes on electric mode:
= Vehicles with hybrid systems generate signiN-
cantly less noise when stationary and when
being driven than vehicles with combustion
engines.
= When you are driving in electric mode, the
vehicle may not be heard by other road users
due to the signiNcantly reduced noise gener-
ated.
It is for this reason that the vehicle is equip-
ped with a sound generator, which serves as
an acoustic vehicle alert system (AVAS).
= If not all the vehicle conditions for electric
mode are met, the combustion engine will be
switched on. %
Vehicles with diesel particulate Nlt ers: during
the regeneration of the diesel particulate Nl-
ter, the drive programmes are not available or
are restricted and the charge level of the high-
voltage battery may change.
Notes on the acoustic vehicle alert system:
= The sound g

enerator generates speed-depend-
ent vehicle noise emissions when the vehicle
is driving forwards or reversing at a speed of
up to around 30 km/h.
= This helps other road users, particularly
pedestrians and cyclists, to hear your vehicle
better.
= When you drive at speeds above 20 km/h the
acoustic vehicle alert system will gradually
switch oM.
= The sound generator will be oM when the vehi-
cle is stationary. Manual disconnection of the high-voltage on-
boar
d electrical system &
DANGER Risk of deat
h and Nre due to
modiNed and/or damaged components of
the high-voltage on-board electrical sys-
tem
The vehicle's high-voltage on-board electrical
sy
stem is under high voltage. If you modify
component parts in the vehicle's high-voltage
on-board electrical system or touch damaged
component parts, you may be electrocuted. In
addition, modiNed and/or damaged compo-
nents may cause a Nre.
In the event of an accident or impact to the
vehicle underbody, components of the high-
voltage electrical system may be damaged
although the damage is not visible. 
Never make any modiNcations t
o the
high-voltage on-board electrical system. 
Do not switch on or use the vehicle if its
high-v
oltage on-board electrical system
components have been modiNed or dam-
aged. Driving and parking
171


Never touch damaged components of
t
he high-voltage on-board electrical sys-
tem. 
Aser an accident, do no
t touch any com-
ponents of the high-voltage on-board
electrical system. 
Aser an accident, ha
ve the vehicle trans-
ported away. 
Have the components of the high-voltage
on-boar
d electrical system checked at a
qualiNed specialist workshop and
replaced if necessary. Requirements:
Onl

y disconnect the high-voltage on-board electri-
cal system manually in the following situations:
= The 6 restraint system warning lamp lights
up in the Instrument Display, e.g. aser an
accident.
= The vehicle is badly damaged, e.g. aser an
accident, and the restraint system compo-
nents have not been triggered. Operating the high-voltage disconnect device

Switch oM t
he vehicle. 
Shis t
he transmission to position j. 
Apply the electric parking brake. 
Secure the vehicle against rolling away (see
t
he vehicle Owner's Manual). 
Open the bonnet. 
Press release tab 1 in t
he direction of the
arrow and pull it out. 
Pull high-voltage disconnect device 2 in t
he
direction of the arrow until it engages.
The high-voltage on-board electrical system is
switched oM.
All work on the hybrid drive system (including
aser disconnecting t

he high-voltage on-board
electrical system manually) may only be carried
out in a qualiNed specialist workshop. Switching on the power supply or the vehicle
&
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.172
Driving and parking

=
oper ate 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. Requirements:
= The k

ey is in the vehicle and is recognised.
= Vehicles with automatic transmission: The
brake pedal is not depressed.
= Vehicles with manual transmission: The clutch
pedal is not depressed. 
To switch on the power supply: pr ess button
1 once.
You can, for example, switch on the wind-
screen wiper.
The power supply is switched oM ag
ain if the fol-
lowing conditions are met:
= You open the driver's door.
= You press button 1 twice more. 
To switch on the vehicle: pr
ess button 1
twice.
Indicator and warning lamps light up on the
instrument cluster.
The vehicle is switched oM ag
ain if one of the fol-
lowing conditions is met:
= Vehicles with automatic transmission: You do
not start the vehicle within 15 minutes and the
transmission is in position j or the electric
parking brake is applied.
= Vehicles with manual transmission: You do not
start the vehicle within 15 minutes and the
electric parking brake is applied.
= You press button 1 once. Starting the vehicle
Starting the vehicle with the start/stop button
&
DANGER Risk of f
atal injuries due to
exhaust gases
Combustion engines emit poisonous exhaust
g
ases such as carbon monoxide. Breathing in Driving and parking
173

these exhaust gases is hazardous to health
and r
esults in poisoning. 
Never leave the engine and, if present,
t

he stationary heater, running in an
enclosed space without suPcient venti-
lation. &
WARNING Risk of Nr
e due to Oammable
material in the engine compartment or the
exhaust system
Flammable materials may ignite. 
Therefore, check regularly that there are
no Oammable mat

erials in the engine
compartment or on the exhaust system. Requirements:
= The k

ey is in the vehicle and is recognised. 
Vehicles with manual transmission: Depr
ess
the clutch pedal. 
Vehicles with automatic transmission: Shis
t
he transmission to position j or i. 
Depress the brake pedal and press button 1
once. 
If the vehicle does not start: switch oM non-
essential consumer
s and press button 1
once. 
If the vehicle still does not start and the Place
the key in the marked space See Owner's
Manual displa

y message appears on the
instrument display: start the vehicle with the
key in the marked space (emergency opera-
tion mode) ( page 174).
% You can switch oM t
he vehicle while driving. To
do this, press button 1 for about three sec-
onds or press button 1 three times within
three seconds. Be sure to observe the safety
notes concerning this under "Driving tips"
(  page 177).
Observe any information regarding display mes-
sag
es that can be displayed on the instrument
display. Starting the vehicle with the key in the stowage
com
partment (emergency operation mode)
If the vehicle does not start and the Place the
key in the marked space See Owner's Manual
message appears in the instrument display, you
can start the vehicle in emergency operation
mode. Marked space (example with cup holder without
co

ver) 174
Driving and parking


Open the cover of marked space 2 if neces-
sar y. 
Make sure that marked space 2 is em
pty.
Remove key 1 fr
om the key ring. 
Place key 1 in mar
ked space 2 on symbol
3.
The vehicle will start aser a short time.
If you remove key 1 from marked space 2,
the vehicle can still be driven. For further
engine starts however, key 1 must be loca-
ted in marked space 2 on symbol 3 during
the entire journey. 
Have key 1 c
hecked at a qualiNed specialist
workshop.
If the vehicle does not start: 
Place key 1 in mar
ked space 2 and leave it
there. 
Vehicles with manual transmission: Depr
ess
the clutch pedal. 
Depress the brake pedal and start the vehicle
using t
he start/stop button. %
You can switch on the power supply or the
v

ehicle with the start/stop button.
Observe any information regarding display mes-
sag
es that can be displayed on the instrument
display. Starting the vehicle via Remote Online Services
Cooling or heating the vehicle interior before
s

tarting the journey
Ensure the following before starting the engine:
= The legal stipulations in the area where your
vehicle is parked allow engine starting via
smartphone.
= It is safe to start and run the engine where
your vehicle is parked.
= The fuel tank is suPciently full.
= The starter battery is suPciently charged.
Charging the starter battery before starting the
journey
You can receive a message on your smartphone
when the state of charge of the starter battery is
low. You can then start the vehicle with the smart- phone to charge the battery. The vehicle is auto-
maticall
y switched oM aser ten minutes.
Ensure the following before starting the engine:
= The legal stipulations in the area where your
vehicle is parked allow engine starting via
smartphone.
= It is safe to start and run the engine where
your vehicle is parked.
= The fuel tank is suPciently full.
Starting the vehicle (Remote Online) &
WARNING Risk of cr
ushing or entrapment
due to unintentional starting of the engine
Limbs could be crushed or trapped if the
engine is s
tarted unintentionally during service
or maintenance work. 
Always secure the engine against unin-
t

entional starting before carrying out
maintenance or repair work. Requirements:
= P

ark position j is selected.
= The anti-thes alarm system is not activated. Driving and parking
175

=
The hazar d warning light system is switched
oM.
= The bonnet is closed.
= The doors are closed and locked.
= The windows and sliding sunroof are closed. 
Start the vehicle using the smartphone.
Aser e

very engine start, the engine runs for
ten minutes.
You can carry out a maximum of two consecutive
s
tarting attempts. You must start the engine with
the key before trying to start the vehicle again
with the smartphone.
You can switch oM the vehicle at any time as fol-
lows:
= Via the Smartphone App
= By pressing the Ü or ß button on the
key
% Further information can be found in the
smar
tphone app. Securing the vehicle against starting before carry-
ing out maint

enance or repair work: 
Switch on the hazard warning light system.
or 
Unlock the doors.
or 
Open a side window or the sliding sunroof. Running-in notes
To preserve the engine during the Nr

st 1,500 km:
= Drive at varying road speeds and engine
speeds.
= Do not drive at speeds greater than
140 km/h.
= Drive the vehicle in driving mode A
or .
= Shis to the next highest gear at the very latest
when the needle reaches the last third before
the red area in the rev counter.
= Do not shis down manually in order to brake.
= Avoid overstraining the vehicle, e.g. driving at
full throttle. =
V
ehicles with automatic transmission: do not
depress the accelerator pedal beyond the
pressure point (kickdown).
= Only increase the engine speed gradually and
accelerate the vehicle to full speed aser
1,500 km.
This also applies when the engine or parts of the
drivetrain have been replaced.
Please also observe the following running-in
notes:
= In certain driving and driving safety systems,
the sensors adjust automatically while a cer-
tain distance is being driven aser the vehicle
has been delivered or aser repairs. Full sys-
tem eMectiveness is not reached until the end
of this teach-in process.
= Brake pads, brake discs and tyres that are
either new or have been replaced only achieve
optimum braking eMect and grip aser several
hundred kilometres of driving. Compensate for
the reduced braking eMect by applying greater
force to the brake pedal. 176
Driving and parking

Notes on driving
&
WARNING Risk of accident due t o objects
in the driver's footwell
Objects in the driver's footwell may impede
pedal tr
avel or block a depressed pedal.
This jeopardises the operating and road safety
of the vehicle. 
Stow all objects in the vehicle securely
so t
hat they cannot get into the driver's
footwell. 
Always Nt t
he Ooor mats securely and as
prescribed in order to ensure that there
is always suPcient room for the pedals. 
Do not use loose Ooor mats and do no
t
place Ooor mats on top of one another. &
WARNING Risk of accident due t
o incor-
rect footwear
Incorrect footwear includes, for example: = shoes wit

h platform soles =
shoes wit
h high heels
= slippers
There is a risk of an accident. 
Always wear suitable footwear so that
y

ou can operate the pedals safely. &
WARNING Risk of accident if t
he vehicle is
switched oM while driving
If you switch oM t
he vehicle while driving,
safety functions are restricted or no longer
available.
This may aMect the power steering system and
the brake force boosting, for example.
You will need to use considerably more force
to steer and brake, for example. 
Do not switch oM t
he vehicle while driv-
ing. &
DANGER Risk of f
atal injuries due to
exhaust gases
Combustion engines emit poisonous exhaust
g
ases such as carbon monoxide. Breathing in
these exhaust gases is hazardous to health
and results in poisoning. 
Never leave the engine and, if present,
t

he stationary heater, running in an
enclosed space without suPcient venti-
lation. &
WARNING Risk of skidding and of an acci-
dent due t
o shising down on slippery road
surfaces
If you shis do
wn on slippery road surfaces to
increase the engine braking eMect, the drive
wheels may lose traction. 
Do not shis do
wn on slippery road surfa-
ces to increase the engine braking
eMect. Driving and parking
177