2022 MERCEDES-BENZ B-CLASS HATCHBACK Owners Manual


Select Driver's seat only.
If t he Driver's seat only setting is deactivated,
pre-entry climate control will take place for
the entire vehicle.
Activating/deactivating pre-entry climate control
f
or departure time (plug-in hybrid)
Requirements: = The high-voltage battery is charged suP-
ciently.
= The function has been activated via the multi-
media system. 
To activate: se
t the departure time
( page 165).
Pre-entry climate control for departure time
switches on a maximum of 55 minutes before
the selected departure time. It will remain
active for another Nve minutes if the departure
is delayed. 
To deactivate: pr
ess the ; button up or
down.
The following functions will remain active once the
v
ehicle has been started:
= Seat heating =
Seat v
entilation Activating/deactivating immediate pre-entry cli-
mat

e control &
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. Air conditioning of the vehicle interior can con-
tinue f

or up to 50 minutes, e.g. if the journey is
interrupted. The colours of the indicator lamp have the follow-
ing meanings:
= Blue: cooling is activ

ated.
= Red: heating is activated.
= Yellow: the departure time has been preselec-
ted. 
Set the desired temperature using the


Press button 1 .
The r ed or blue indicator lamp on button 1
will light up or go out. Stationary heater/ventilation
Stationary heater/ventilation function
%
The following function is equipment-depend-
ent.
= The air inside t
he vehicle is heated or ventila-
ted to the set temperature.
= The air inside the vehicle cannot be cooled
down to temperatures below the outside tem-
perature.
= If the outside temperature changes, ventilation
mode will automatically switch to heating
mode or heating mode will automatically
switch to ventilation mode.
The stationary heater and the exhaust gas outlet
are situated in front of the right front wheel. Switching the stationary heater/ventilation
on/oM
via t
he operating unit &
DANGER Risk of f
atal injury due to poison-
ous exhaust gases
If the tailpipe is blocked or suPcient v
entila-
tion is not possible, poisonous exhaust gases
such as carbon monoxide may enter the vehi-
cle. This is the case in enclosed spaces or if
the vehicle gets stuck in snow, for example. 
Always switch the stationary heater oM in
enclosed spaces wit
hout an air extrac-
tion system, e.g. in garages. 
Keep the tailpipe and the area around
t

he vehicle free from snow when the
engine or the stationary heater is run-
ning. 
Open a window on the side of the vehicle
f

acing away from the wind to ensure an
adequate supply of fresh air. &
WARNING Risk of Nr
e due to hot station-
ary heater components and exhaust gases
Flammable materials such as leaves, grass or
twigs ma
y ignite. 
When the stationary heater is switched
on, mak

e sure that:
= hot vehicle parts do not come into
contact with Oammable materials.
= the exhaust gas can Oow out of the
stationary heater exhaust pipe unhin-
dered.
= the exhaust gas does not come into
contact with Oammable materials. *
NOTE Batt
ery discharge caused by sta-
tionary heater or stationary ventilation
operation Operating the stationary heater or stationary
v

entilation drains the battery. 
Aser heating or v
entilating the vehicle
twice, drive for a longer period of time. Climate control
167

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