key MERCEDES-BENZ B-CLASS HATCHBACK 2015 Service Manual

The exterior lighting (except the side lamps/
parking lamps) switches off automatically if you:
R remove the key from the ignition lock
R open the driver's door with the key in posi-
tion 0in the ignition lock.
Automatic headlamp mode à is the preferred light switch setting. The
light setting is automatically selected according to the brightness of the ambient light (excep-
tion: poor visibility due to weather conditions
such as fog, snow or spray):
R key in position 1in the ignition lock: the side
lamps are switched on or off automatically
depending on the brightness of the ambient
light
R with the drive system running: if you have
switched on the daytime driving lights func-
tion in the on-board computer, the daytime
driving lights or the side lamps and dipped-
beam headlamps are switched on or off auto-
matically depending on the brightness of the
ambient light
X To switch on the automatic headlamps:
turn the light switch to the
Ãposition. G
WARNING
When the light switch is set to Ã, the
dipped-beam headlamps may not be switched on automatically if there is fog, snow or othercauses of poor visibility due to the weather
conditions such as spray. There is a risk of an
accident.
In such situations, turn the light switch to
L.
The automatic headlamp feature is only an aid.
The driver is responsible for the vehicle lighting at all times.
The daytime driving lights improve the detecta-
bility of your vehicle during the day. To do this,
the daytime driving lights function must be
switched on via the on-board computer
(Y page 186).
When the side lamps and dipped-beam head-
lamps are switched on, the green T(side
lamps) and L(dipped-beam headlamps)
indicator lamps in the instrument cluster light
up. Dipped-beam headlamps
When the ignition is switched on and the light
switch is in the Lposition, the side lamps
and dipped-beam headlamps are switched on
even if the light sensor does not sense dark
ambient light conditions. This is advantageous
when there is fog or rain.
X To switch on the dipped-beam headlamps:
turn the key to position 2in the ignition lock
or start the drive system.
X Turn the light switch to L.
The green Lindicator lamp in the instru-
ment cluster lights up.
Rear foglamp The rear foglamp improves the visibility of your
vehicle in heavy fog for the following traffic.
Please observe the country-specific laws on the
use of rear foglamps.
X To switch on the rear foglamp: turn the key
to position 2in the ignition lock or start the
drive system.
X Turn the light switch to LorÃ.
X Press the Rbutton.
The yellow Rindicator lamp in the instru-
ment cluster lights up.
X To switch off the rear foglamp: press the
R button.
The yellow Rindicator lamp in the instru-
ment cluster goes out.
Side lamps
! If the battery charge level is very low, the
side lamps or parking lamps are switched off automatically in order to preserve energy to
start the drive system. Always park your vehi-
cle safely in a place that is adequately lit in
accordance with legal stipulations. Avoid
using the side lamps Tfor periods of sev-
eral hours. Where possible, switch the right-
hand X or left-hand Wparking lamp on.
X To switch on: turn the light switch to T.
The green Tindicator lamp in the instru-
ment cluster lights up.
Parking lamps Switching on the parking lamps ensures that the
corresponding side of the vehicle is illuminated. 98
Exterior lightingLights and windscreen wipers

X
To switch on the parking lamps: the key
should not be in the ignition lock or it should
be in position 0.
X Turn the light switch to W(left-hand side of
the vehicle) or X(right-hand side of the
vehicle).
Adjusting the headlamp range (halogen
headlamps) g
Driver's seat and front-passenger seat
occupied
1 Driver's seat, front-passenger seat and rear
seats occupied
2 Driver's seat, front-passenger seat and rear
seats occupied, luggage compartment
laden
3 Driver's and front-passenger seat occupied
and maximum permissible rear axle load uti-
lised
The headlamp range control allows you to adjust
the cone of light from the headlamps to suit the
vehicle load.
X Start the drive system.
X Turn the headlamp range control to the posi-
tion which corresponds to the load in your
vehicle. Combination switch
Turn signals :
Main-beam headlamps
; Turn signal, right
= Headlamp flasher
? Turn signal, left
X To indicate briefly: press the combination
switch briefly to the pressure point in the
direction of arrow ;or?.
The corresponding turn signal flashes three
times.
X To indicate: press the combination switch
beyond the pressure point in the direction of
arrow ;or?.
Main-beam headlamps X
To switch on the main-beam headlamps:
turn the key in the ignition lock to position 2
or start the drive system.
X Turn the light switch to LorÃ.
X Press the combination switch beyond the
pressure point in the direction of arrow :.
In the Ãposition, the main-beam head-
lamps are only switched on when it is dark and the engine is running.
The blue Kindicator lamp in the instru-
ment cluster lights up when the main-beam
headlamps are switched on.
X To switch off the main-beam headlamps:
move the combination switch back to its nor-
mal position.
The blue Kindicator lamp in the instru-
ment cluster goes out.
Vehicles with Adaptive Highbeam Assist: when
Adaptive Highbeam Assist is active, it controls
activation and deactivation of the main-beam
headlamps (Y page 101). Exterior lighting
99Lights andwindscreen wipers Z

Headlamp flasher
X
To switch on: turn the key in the ignition lock
to position 1or 2or start the drive system.
X Pull the combination switch in the direction of
arrow =. Headlamp cleaning system
Vehicles with bi-xenon headlamps: the head-
lamps are cleaned automatically if the "Wipe
with washer fluid" function is operated five
times (Y page 108) while the lights are on and
the drive system is running. When you switch off the ignition, the automatic headlamp cleaning
system is reset and counting is resumed from 0. Hazard warning lamps
X
To switch on the hazard warning lamps:
press button :.
All turn signals flash. If you now switch on a
turn signal using the combination switch, only the turn signal lamp on the corresponding
side of the vehicle will flash.
X To switch off the hazard warning lamps:
press button
:.
The hazard warning lamps switch on automati-
cally if:
R an airbag is deployed or
R the vehicle decelerates rapidly from a speed
of above 70 km/h and comes to a standstill
The hazard warning lamps switch off automati-
cally if the vehicle reaches a speed of above
10 km/h again after a full brake application.
The hazard warning lamps continue to operate
even if the ignition is switched off. Intelligent Light System
General notes The Intelligent Light System is a system that
adjusts the headlamps automatically to suit the
prevailing driving and weather conditions. It
offers advanced functions for improved illumi-
nation of the road surface, e.g. depending on the vehicle speed or weather conditions. The sys-
tem includes the active light function, corneringlight function, motorway mode and extended
range foglamps. The system is only active when it is dark.
You can activate or deactivate the "Intelligent
Light System" function using the on-board com-
puter (Y page 187).
Active light function The active light function is a system that moves
the headlamps according to the steering move-
ments of the front wheels. In this way, relevant
areas remain illuminated while you are driving.
This allows you to recognise pedestrians,
cyclists and animals.
Active: when the lights are switched on.
Cornering light function 100
Exterior lightingLights and windscreen wipers

A
p Switches the right-hand front reading
lamp on/off
B Switches the automatic interior lighting con-
trol on
Control panel in the grab handle in the
rear compartment :
Switches the reading lamp on/off Interior lighting control
General notes In order to prevent the vehicle's battery from
discharging, the interior lighting functions are
automatically deactivated after some time
except when the key is in position 2in the igni-
tion lock.
The colour and brightness for the ambient light- ing may be set using COMAND Online or Audio
20 (see the separate operating instructions).
Automatic interior lighting control X
To switch on: set the switch to centre posi-
tion B.
X To switch off: set the switch to the |
position.
The interior lighting automatically switches on if you:
R unlock the vehicle
R open a door
R remove the key from the ignition lock
The interior lighting is activated for a short time
when the key is removed from the ignition lock.
This delayed switch-off can be adjusted using
COMAND Online or Audio 20 (see the separate
operating instructions). Manual interior lighting control X
To switch the front interior lighting on: set
the switch to the cposition.
X To switch off the interior lighting: set the
switch to the |position or (if the door is
closed) to the centre position.
X To switch the rear interior lighting on or
off:
press the ubutton.
X To switch the reading lamp on or off: press
the p button. Crash-responsive emergency lighting
The interior lighting is activated automatically if
the vehicle is involved in an accident.
X To switch off the crash-responsive emer-
gency lighting: press the hazard warning
lamp button.
or X Lock and then unlock the vehicle using the
key. Replacing bulbs
Important safety notes
Xenon bulbs G
DANGER
Xenon bulbs are under high voltage. You can
get an electric shock if you remove the cover
of the xenon bulb and touch the electrical
contacts. There is a risk of fatal injury.
Never touch the parts or the electrical con-
tacts of the xenon bulb. Always have work on the xenon bulbs carried out at a qualified spe- cialist workshop.
If your vehicle is equipped with xenon bulbs, you can recognise this by the following: the cone of
light from the xenon bulbs moves from the top to the bottom and back again when you start the
drive system. For this to be observed, the lights
must be switched on before the drive system is started.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times. Have
the headlamp setting checked regularly. Replacing bulbs
103Lights and windscreen wipers Z

!
If the windscreen wipers leave smears on
the windscreen after the vehicle has been
washed in an automatic car wash, this may be
due to wax or other residue. Clean the wind-
screen with washer fluid after an automatic
car wash. Combination switch
1
$ Windscreen wipers off
2 Ä Intermittent wipe, low (rain sensor set
to low sensitivity)
3 Å Intermittent wipe, high (rain sensor
set to high sensitivity)
4 ° Continuous wipe, slow
5 ¯ Continuous wipe, fast
B í Single wipe/î wipes the wind-
screen using washer fluid
X Turn the key to position 1or 2in the ignition
lock (Y page 126).
X Turn the combination switch to the corre-
sponding position.
! Vehicles with a rain sensor: if the wind-
screen becomes dirty in dry weather condi-
tions, the windscreen wipers may be activa-
ted inadvertently. This could damage the
windscreen wiper blades or scratch the wind- screen.
For this reason, you should always switch off
the windscreen wipers in dry weather.
Vehicles with a rain sensor: in the ÄorÅ
position, the appropriate wiping frequency is
automatically set according to the intensity of
the rain. In the Åposition, the rain sensor is
more sensitive than in the Äposition, caus-
ing the windscreen wiper to wipe more fre-
quently.
If the wiper blades are worn, the windscreen will
no longer be wiped properly. This could mean
you are unable to observe the traffic conditions. Switching the rear window wiper on/
off Combination switch
:
è Switch
2 ô Wipes with washer fluid
3 ISwitches on intermittent wiping
4 0Switches off intermittent wiping
5 ô Wipes with washer fluid
X Turn the key to position 1or 2in the ignition
lock (Y page 126).
X Slide switch :on the combination switch to
the corresponding position.
When the rear window wiper is switched on,
the è symbol appears in the assistance
graphic in the instrument cluster. Further
information on the assistance graphic
(Y page 182). Replacing the wiper blades
Important safety notes G
WARNING
If the windscreen wipers begin to move while
you are changing the wiper blades, you can be trapped by the wiper arm. There is a risk of
injury.
Always switch off the windscreen wipers and
ignition before changing the wiper blades.
! To avoid damaging the windscreen wiper
blades, make sure that you touch only the
wiper arm of the windscreen wiper.
! Never open the bonnet/tailgate if a wiper
arm is folded away from the windscreen/rear
window. Windscreen wipers
109Lights and windscreen wipers Z

Never fold a windscreen wiper arm without a
wiper blade back onto the windscreen/rear
window.
Hold the windscreen wiper arm firmly when
you change the wiper blade. If you release the
wiper arm without a wiper blade and it falls
onto the windscreen/rear window, the wind-
screen/rear window may be damaged by the
force of the impact.
Mercedes-Benz recommends that you have
the wiper blades changed at a qualified spe-
cialist workshop.
Replacing the windscreen wiper blades (variant 1) Removing the wiper blades
X Vehicles without KEYLESS-GO: remove the
key from the ignition lock.
X Vehicles with KEYLESS-GO: switch off the
engine.
X Fold the wiper arm away from the windscreen. X
Press both release clips ;.
X Fold wiper blade :in the direction of
arrow =away from wiper arm ?.
X Remove wiper blade :in the direction of
arrow A. Fitting the wiper blades X
Position new wiper blade :with recess B
on lug A.
X Fold wiper blade :in the direction of arrow
= onto the wiper arm until retaining clips ;
engage in bracket ?.
X Make sure that wiper blade :is seated cor-
rectly.
X Fold the wiper arm back onto the windscreen.
Replacing the windscreen wiper blades (variant 2) Removing the wiper blades
X Vehicles without KEYLESS-GO: remove the
key from the ignition lock.
X Vehicles with KEYLESS-GO: switch off the
engine.
X Fold the wiper arm away from the windscreen. X
Hold onto the wiper arm with one hand. With
the other hand, turn the wiper blade in the
direction of arrow :away from the wiper arm
as far as it will go.
X Slide catch ;in the direction of arrow =
until it engages in the removal position with a noticeable click. 110
Windscreen wipersLights and windscreen wipers

X
Remove the wiper blade in the direction of
arrow ?away from the wiper arm.
Fitting the wiper blades X
Insert the new wiper blade into the wiper arm
in the direction of arrow :.X
Slide catch ;in the direction of arrow =
until it engages in the locking position with a
noticeable click.
X Make sure that the wiper blade is seated cor-
rectly.
X Fold the wiper arm back onto the windscreen. X
Remove protective film :of the service indi-
cator on the tip of the wiper blade.
If the colour of the service indicator changes
from black to yellow, the wiper blades should be replaced.
i The duration of the colour change varies
depending on the usage conditions.
Replacing the rear window wiper blade Removing the wiper blades
X
Remove the key from the ignition lock.
X Fold wiper arm :away from the rear window
until you feel it engage.
X Position wiper blade ;at a right angle to
wiper arm :.
X Hold wiper arm :and press wiper blade ;
in the direction of the arrow until it releases.
X Remove wiper blade ;.
Fitting a wiper blade
X Place new wiper blade ;onto wiper arm :.
X Hold wiper arm :and press wiper blade ;
in the opposite direction to the arrow until it
engages. Windscreen wipers
111Lights and windscreen wipers Z

Problems with the windscreen wipers
Problem
Possible causes/consequences and
M
MSolutions The windscreen wipers
are jammed. Leaves or snow, for example, may be obstructing the windscreen
wiper movement. The wiper motor has been deactivated.
X For safety reasons, you should remove the key from the ignition
lock.
X Remove the cause of the obstruction.
X Switch the windscreen wipers back on. The windscreen wipers
fail completely. The windscreen wiper drive is malfunctioning.
X Select another wiper speed on the combination switch.
X Have the windscreen wipers checked at a qualified specialist work-
shop. The windscreen washer
fluid from the spray noz-
zles no longer hits the
centre of the wind-
screen. The spray nozzles are misaligned.
X Have the spray nozzles adjusted at a qualified specialist workshop. Windscreen wipers
113Lights and windscreen wipers Z

Useful information
i This Owner's Manual describes all models,
series and optional equipment for your vehi-
cle that were available at the time of going to
press. National variations are possible. Note
that your vehicle may not be equipped with all
of the functions described. This is also the
case for systems and functions relevant to
safety.
i Read the information on qualified specialist
workshops: (Y page 23). Overview of climate control systems
General notes
Observe the settings recommended on the fol-
lowing pages. The windows could otherwise
mist up.
To prevent the windows from misting up:
R switch off climate control only briefly
R activate air-recirculation mode only briefly
R activate the "Cooling with air dehumidifica-
tion" function
R activate the windscreen demisting function
briefly, if required
THERMOTRONIC automatic climate control reg-
ulates the temperature and the humidity in the
vehicle interior and filters undesirable substan-
ces out of the air.
THERMOTRONIC automatic climate control is
only operational when the vehicle is ready to
drive. Optimum operation is only achieved with
the side windows closed.
The residual heat function can only be activated or deactivated with the ignition switched off
(Y page 122).
Always keep the ventilation flaps behind the
side panelling clear (Y page 106). Otherwise the
vehicle will not be ventilated correctly.
i Ventilate the vehicle for a brief period during
warm weather, e.g. using the convenience
opening feature (Y page 83). This will speed
up the cooling process and the desired inte-
rior temperature will be reached more
quickly.
i The integrated filter filters out most parti-
cles of dust and soot and completely filters
out pollen. It also reduces gaseous pollutants and odours. A clogged filter reduces the
amount of air supplied to the vehicle interior.
For this reason, you should always observe
the interval for replacing the filter, which is
specified in the Service Booklet. As this
depends on environmental conditions, e.g.
heavy air pollution, the interval may be
shorter than stated in the Service Booklet.
i Vehicles with auxiliary heating:
under
certain environmental conditions, the resid-
ual heat function may be activated automati-
cally an hour after the key has been removed
in order to dry the automatic climate control.
When the automatic climate control drying
function is active, the blue LED lamp is lit in
the rocker switch in the centre console. The
vehicle is then ventilated for 30 minutes.
Vehicles without auxiliary heating: under
certain environmental conditions, the resid-
ual heat function may be activated automati-
cally an hour after the key has been removed in order to dry the automatic climate control.
The vehicle is then ventilated for 30 minutes. 114
Overview of climate control systemsClimate control

appears for approximately three seconds at
the bottom of the screen in the Audio/
COMAND display (see separate operating
instructions). You will see the current settings
of the various climate control functions.
You can choose between various drive programs
with the program selector button (Y page 131).
If you have selected drive program E+:
R the cooling output is reduced when cooling
R the heat output is reduced during heating
R the rear window heating time is reduced
If you have selected drive program Eor S, the
current climate settings are maintained. Operating the climate control system
Switching the climate control on/off
General notes When the climate control is switched off, the air
supply and air circulation are also switched off.
The windows could mist up. Therefore, only
switch off climate control briefly.
THERMOTRONIC automatic climate
control X
Turn the key to position 2in the ignition lock
(Y page 126).
X To activate: press theÃbutton.
The indicator lamp in the Ãbutton lights
up. Airflow and air distribution are set to auto-
matic mode.
or X Press the ^button.
The indicator lamp in the ^button goes
out. The previous settings are reactivated.
X To deactivate: press the^button.
The indicator lamp in the ^button lights
up.
i Activate climate control primarily using the
à button. Activating/deactivating cooling with
air dehumidification
General notes 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.
The "Cooling with air dehumidification" function
is operational when the vehicle is ready to drive. The air inside the vehicle is cooled and dehu-
midified according to the temperature selected.
Condensation may drip from the underside of
the vehicle when cooling mode is active. This is
normal and not a sign that there is a malfunc-
tion.
Activating/deactivating X
To activate: press the¿button.
The indicator lamp in the ¿button lights
up.
X To deactivate: press the¿button.
The indicator lamp in the ¿button goes
out. The cooling with air dehumidification
function has a delayed switch-off feature. 116
Operating the climate control systemClimate control