2015 MERCEDES-BENZ B-CLASS HATCHBACK light

Problems with the "Cooling with air dehumidification" function
Problem
Possible causes/consequences and
M
MSolutions The indicator lamp in the
¿ button flashes
three times or remains
off. The cooling with air
dehumidification func-
tion cannot be activated. The cooling with air dehumidification function has been deactivated
due to a malfunction.
X Visit a qualified specialist workshop. Setting climate control to automatic
mode
General notes In automatic mode, the set temperature is main-
tained automatically at a constant level. The
system automatically regulates the temperature of the dispensed air, the airflow and the air dis- tribution.
The automatic mode functions optimally when
the "Cooling with air dehumidification" function is activated. If desired, cooling with air dehu-
midification can be deactivated.
If you deactivate the "Cooling with air-dehumid-
ification" function, the air inside the vehicle will
not be cooled. The air inside the vehicle will also
not be dehumidified. The windows can mist up
more quickly. Therefore, only deactivate the
"Cooling with air-dehumidification" function
briefly.
Setting climate control to automatic
mode X
Turn the key to position 2in the ignition lock
(Y page 126).
X Set the desired temperature.
X To activate: press theÃbutton.
The indicator lamp in the Ãbutton lights
up. Automatic air distribution and airflow are
activated.
X To switch to manual mode: press theÉ
or Ë button.
or X Press the KorI button.
The indicator lamp in the Ãbutton goes
out. Automatic air distribution and airflow are deactivated. Setting the temperature
Different temperatures can be set for the driv-
er's and front-passenger sides. The set temper-
ature is automatically maintained at a constant
level.
X Turn the key to position 2in the ignition lock
(Y page 126).
X To increase/reduce: turn control:orE
anti-clockwise or clockwise. Only change the
temperature setting in small increments.
Start at 22 †. Setting the air distribution
Air distribution settings ¯
Directs the airflow through the demister
vents
P Directs the airflow through the centre
and side air vents
O Directs the airflow through the footwell
air vents
S Directs the airflow through the centre
and side air vents as well as the footwell
air vents
b Directs the airflow through the centre
and side air vents as well as the demister
vents
a Directs the airflow through the footwell
and demister vents
_ Directs the airflow through the demister
vents, the centre and side air vents as
well as the footwell air vents
i Regardless of the air distribution setting,
airflow is always directed through the side air
vents. The side air vents can only be closed if the adjusters are turned clockwise until they
engage. Operating the climate control system
117Climate control

Setting the air distribution
X
Turn the key to position 2in the ignition lock
(Y page 126).
X Press the ÉorË button repeatedly
until the desired symbol appears in the dis-
play. Setting the airflow
X Turn the key to position 2in the ignition lock
(Y page 126).
X To increase/reduce: press theKor
I button. Switching the ZONE function on/off
X To activate: press theábutton.
The indicator lamp in the ábutton lights
up.
The temperature setting for the driver's side
is not adopted for the front-passenger side.
X To deactivate: press theábutton.
The indicator lamp in the ábutton goes
out.
The temperature setting for the driver's side
is adopted for the front-passenger side. Demisting the windscreen
General notes You can use this function to defrost the wind-
screen or to demist the inside of the windscreen
and the side windows.
i You should only select the "Windscreen
demisting" function until the windscreen is
clear again.
Switching the "Windscreen demisting"
function on/off X
Turn the key to position 2in the ignition lock
(Y page 126).
X To activate: press the¬button.
The indicator lamp in the ¬button lights
up. The climate control system switches to the
following functions:
R high airflow
R high temperature
R air distribution to the windscreen and front
side windows
R air-recirculation mode off
Vehicles with windscreen heating: the
windscreen heating is switched on automati-
cally using the "Windscreen demisting" func-
tion.
i The "Windscreen demisting" function auto-
matically sets the blower output to the opti-
mum demisting effect. As a result, the airflow may increase or decrease automatically after
the ¬ button is pressed.
i You can adjust the blower output manually
while the "Windscreen demisting" function is
in operation:
Press the óorô button.
X To deactivate: press the¬button.
The indicator lamp in the ¬button goes
out. The previous settings are reactivated.
Air-recirculation mode remains deactivated.
or
X Press the Ãbutton.
The indicator lamp in the ¬button goes
out. Airflow and air distribution are set to
automatic mode.
or X Turn temperature control :orE anti-clock-
wise or clockwise (Y page 115). Demisting the windows
Windows misted up on the inside X
Activate the ¿"Cooling with air dehumid-
ification" function.
X Activate automatic mode Ã.
X If the windows continue to mist up, activate
the ¬ "Windscreen demisting" function.
i You should only select this setting until the
windscreen is clear again. 118
Operating the climate control systemClimate control

Windows misted up on the outside
X
Activate the windscreen wipers.
X Set the air distribution to PorO.
i You should only select this setting until the
windscreen is clear again. Rear window heating
General notes The rear window heating has a high current
draw. You should therefore switch it off as soon
as the window is clear. It otherwise switches off automatically after several minutes.
If the battery voltage is too low, the rear window
heating may switch off.
Switching on/off X
Turn the key to position 2in the ignition lock
(Y page 126).
X Press the ¤button.
The indicator lamp in the ¤button lights
up or goes out. Operating the climate control system
119Climate control

Problems with the rear window heating
Problem
Possible causes/consequences and
M
MSolutions The rear window heating
has switched off prema-
turely or cannot be acti-
vated. The battery has not been sufficiently charged.
X Switch off any consumers that are not required, e.g. reading lamps,
interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window heating
can be activated again. Switching air-recirculation mode
on/off
General notes You can deactivate the flow of fresh air if
unpleasant odours are entering the vehicle from
outside. The air already inside the vehicle will
then be recirculated.
If you activate air-recirculation mode, the win-
dows can mist up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows misting up.
Switching on/off X
Turn the key to position 2in the ignition lock
(Y page 126).
X To activate: press theebutton.
The indicator lamp in the ebutton lights
up.
Air-recirculation mode is activated automati-
cally:
R at high outside temperatures
R at high levels of pollution
When air-recirculation mode is activated auto-
matically, the indicator lamp in the ebutton
is not lit. Outside air is added after about
30 minutes.
X To deactivate: press theebutton.
The indicator lamp in the ebutton goes
out. i
Air-recirculation mode is deactivated auto-
matically:
R after approximately five minutes at outside
temperatures below approximately 7 †
R after approximately five minutes if the
"Cooling with air dehumidification" func-
tion is deactivated
R after approximately 30 minutes at outside
temperatures above approximately 7 † if
the cooling with air dehumidification func-
tion is activated Convenience opening or closing using
the air-recirculation button G
WARNING
When using convenience closing, you could
become trapped within the sweep of the clos- ing window. There is a risk of injury.
Monitor the entire closing procedure when
using convenience closing. When closing,
make sure that no one has any parts of the
body within the closing area. G
WARNING
During convenience opening parts of the body could be drawn in or become trapped
between the side window and window frame.
There is a risk of injury.
When opening, make sure that nobody is
touching the side window. If someone
becomes trapped, immediately press
the W switch in the door to stop the move-
ment of the side windows. To continue closing
the side window, pull on the Wswitch. 120
Operating the climate control systemClimate control

X
Convenience closing feature: press and
hold the ebutton until the side windows
are closed.
The indicator lamp in the ebutton lights
up. Air-recirculation mode is activated.
If parts of the body are in the closing area during convenience closing, proceed as follows:
X Press the Wbutton for opening/closing
the side windows.
The side windows stop.
X To then open the side windows, press the
W button again.
or
X Press the ebutton for longer than two
seconds.
The side windows move in the opposite direc- tion.
X Convenience opening feature: press and
hold the ebutton until the side windows
are opened. The side windows move back to
their original positions.
The indicator lamp in the ebutton goes
out. Air-recirculation mode is deactivated.
Notes on the reversing feature for the side win-
dows (Y page 82).
If you open the side windows manually after
closing them using the convenience closing fea- ture, they will remain in this position when
opened using the convenience opening feature. Pre-entry climate control via key
Before getting in, the vehicle interior can be
briefly warmed or ventilated in advance. In addi- tion, the air from the air vent can be pre-cooled.
The high-voltage battery must be sufficiently
charged before the "Pre-entry climate control
via key" function can be activated.
Activating/deactivating the pre-entry cli-
mate control (via key)
When the vehicle is unlocked using the key or
KEYLESS-GO, the climate control functions are
activated.
The pre-cooling and pre-heating climate control functions last up to 5 minutes.
When the vehicle is pre-cooled, the following
functions are activated as necessary:
R Automatic climate control
R Cooling with air dehumidification
R Blower When the vehicle is pre-heated, the following
functions are activated as necessary:
R Automatic climate control
R Blower
R Seat heating
R Windscreen heating
R Rear window heating
Pre-entry climate control is automatically
switched off when operational readiness mode
is requested.
Activating/deactivating pre-entry climate
control (via key)
You can activate and deactivate the pre-entry
climate control (via key) function using the on-
board computer in the E-CELL
E-CELL submenu
(Y page 185).
i If the charge status of the high-voltage bat-
tery is below the specified minimum charge
status, pre-entry climate control will not be
activated even if it has been set. Pre-entry climate control at departure
time and immediate pre-entry climate control
Important safety notes G
WARNING
If persons (particularly children) are exposed
to heat or cold for a prolonged period, there is a risk of serious or even fatal injuries. Never
leave persons (particularly children) unatten-
ded in the vehicle.
General notes Using the "Pre-entry climate control at depar-
ture time" function, you can cool or heat the
vehicle interior prior to the desired departure
time.
When using the "Pre-entry climate control at
departure time" function, the charge status of
the high-voltage battery must be higher than the
specified minimum charge status.
The running time of the climate control may be
reduced if:
R the vehicle is not connected to an electric
power supply
R the high-voltage battery is not fully charged Operating the climate control system
121Climate control Z

With active "Pre-entry climate control at depar-
ture time" the charge status of the high-voltage
battery can be reduced, even if the charge cable connector is connected.
In certain situations, the desired interior tem-
perature cannot be reached.
When the vehicle is cooled, the following func-
tions are activated as necessary:
R Automatic climate control
R cooling with air dehumidification
R blower
When the vehicle is heated, the following func-
tions are activated as necessary:
R Automatic climate control
R Blower
R Seat heating
R Windscreen heating
R Rear window heating
"Immediate pre-entry climate control" is auto-
matically switched off when operational readi-
ness mode is requested.
Setting the departure time You can set a departure time for the "Pre-entry
climate control at departure time". Your vehicle
will then be cooled or heated until the desired
temperature is reached in time for the set depar-
ture time. "Pre-entry climate control at depar-
ture time" will be activated a maximum of
35 minutes before departure. If the departure is delayed, the vehicle will be heated or cooled fora further five minutes.
You can set the desired departure time in the E-
E-
CELL
CELL submenu on the on-board computer
(Y page 184).
Activating immediate pre-entry climate
control You can activate "Immediate pre-entry climate
control" even if the vehicle interior is already at
the desired temperature. This means, for exam- ple, that the vehicle interior continues to be
cooled or heated if the journey is interrupted for up to 50 minutes and the interior temperature iskept constant. You can only set the desired tem-
perature using the climate control unit. If you do not pre-select a temperature, the last tempera-
ture set will be automatically adopted. To activate/deactivate "Immediate pre-
entry climate control"
X Press button :in the centre console.
The blue or red indicator lamp in the button
lights up or goes out.
The colours of the indicator lamps in the button have the following meanings:
Red Heating activated
Blue Cooling activated
Yellow Pre-entry climate control at departure is preselected Switching the residual heat on/off
General notes It is possible to make use of the residual heat of
the engine to continue heating the vehicle for a
short period after the drive system has been
switched off. The heating time depends on the
set interior temperature.
i The blower will run at a low speed regardless
of the airflow setting.
i If you activate the residual heat function at
high temperatures, only the ventilation will be
activated. The blower runs at medium speed.
i You cannot use the ventilation to cool the
vehicle interior to a temperature lower than
the outside temperature. 122
Operating the climate control systemClimate control

Switching on/off
X
Turn the key to position 0in the ignition lock
or remove it (Y page 126).
X To activate: press theÌbutton.
The indicator lamp in the Ìbutton lights
up.
X To deactivate: press theÌbutton.
The indicator lamp in the Ìbutton goes
out.
i Residual heat is deactivated automatically:
R after approximately 30 minutes
R when the ignition is switched on
R if the battery voltage drops Air vents
Important safety notes
G
WARNING
Very hot or very cold air can flow from the air vents. This could result in burns or frostbite in the immediate vicinity of the air vents. There
is a risk of injury.
Make sure that all vehicle occupants always
maintain a sufficient distance to the air out-
lets. If necessary, redirect the airflow to
another area of the vehicle interior.
In order to ensure the direct flow of fresh air
through the air vents into the vehicle interior,
please observe the following notes:
R keep the air inlet between the windscreen and
the bonnet free of blockages, such as ice,
snow or leaves
R never cover the vents or ventilation grilles in
the vehicle interior
i Optimal climate control function is achieved
by opening the air vents fully and setting the
adjusters to the middle position. Adjusting the centre air vents
X
To open the centre air vent: turn the
adjuster in one of centre air vents :to the
left.
X To close the centre air vent: turn the
adjuster in one of centre air vents :clock-
wise as far as it will go. Adjusting the side air vents
:
Side window demister vent
; Side air vent
X To open a side air vent: turn the adjuster in
side air vent ;to the left.
X To close a side air vent: turn the adjuster in
side air vent ;clockwise as far as it will go. Air vents
123Climate control Z

sufficient. If necessary, counteract the reduced
regenerative braking effect by applying the
brake yourself.
Before commencing your journey, ensure that
the charging cable required for charging the
high-voltage battery is in the vehicle. Key positions
Key g
To remove the key
1 Power supply for some consumers, such as
the windscreen wipers
2 Ignition (power supply for all consumers)
and drive position
3 To start the vehicle
i If the key does not belong to the vehicle, it
can still be turned in the ignition lock. How-
ever, the ignition will not be switched on. and
the drive system cannot be started.
Start/Stop button General notes
Vehicles with KEYLESS-GO are equipped with
keys featuring an integrated KEYLESS-GO func- tion and a detachable Start/Stop button.
A check which periodically establishes a radio
connection between the vehicle and the key
determines whether a valid key is in the vehicle. This occurs, for example, when starting the drivesystem.
When you insert the Start/Stop button into the
ignition lock, the system needs approximately
two seconds recognition time. You can then use the Start/Stop button.
Pressing the Start/Stop button several times in
succession corresponds to the different key positions in the ignition lock. This is only the
case if you are not depressing the brake pedal.
If you depress the brake pedal and press the
Start/Stop button, the drive system starts
immediately.
To start the vehicle without actively using the
key:
R the Start/Stop button must be inserted in the
ignition lock
R the key must be in the vehicle
R the vehicle must not be locked with the key or
KEYLESS-GO (Y page 72)
Do not keep the KEYLESS-GO key:
R with electronic devices, e.g. a mobile phone
or another key
R with metallic objects, e.g. coins or metal film
R inside metallic objects, e.g. a metal case
This can affect the functionality of KEYLESS-GO.
If you lock the vehicle with the key's remote
control or with KEYLESS-GO, after a short time:
R you will not be able to switch on the ignition
with the Start/Stop button
R you will not be able to start the drive system
with the Start/Stop button until the vehicle is
unlocked again
If you lock the vehicle centrally using the button
on the front door (Y page 79), you can continue
to start the drive system with the Start/Stop
button.
The drive system can be switched off while the
vehicle is in motion by pressing and holding the
Start/Stop button for three seconds.
Key positions with the Start/Stop button :
Start/Stop button
; Ignition lock
When you switch on the ignition, all of the indi-
cator lamps in the instrument cluster light up. 126
DrivingDriving and parking