warning MERCEDES-BENZ B-CLASS HATCHBACK 2011 Repair Manual

The exterior mirror on the front-passenger
side moves back to its original position:
R
as soon as you exceed a speed of
15 km/h
R about ten seconds after you have disen-
gaged reverse gear
R if you press button :for the exterior mir-
ror on the driver's side Memory functions
Storing settings
G
WARNING
Only use the memory function on the driver's
side when the vehicle is stationary. You could
otherwise be distracted from the traffic con-
ditions by the seat moving of its own accord,
and as a result cause an accident. G
WARNING
The memory function can still be used if the
key has been removed. For this reason, chil-
dren should never be left unsupervised in the
vehicle. Otherwise, they could adjust the
seats and become trapped.
With the memory function, you can store up
to three different settings, e.g. for three dif-
ferent people.
The following settings are stored as a single
memory preset:
R position of the seat, backrest and head
restraint
R driver's side: position of the exterior mir-
rors on the driver's and front-passenger
sides X
Adjust the seat (Y page 88).
X Adjust the exterior mirror on the driver's
side (Y page 91).
X Briefly press the Mmemory button and
then press storage position button 1,2or
3 within three seconds.
The settings are stored in the selected pre-
set position. Atone sounds when the set-
tings have been completed. Calling up
astore dsetting
X Press and hold the relevant storage posi-
tion button 1,2or 3until the seat and
exterio rmirrors are in the stored position.
i The setting procedure is interrupted as
soon as you release the storage position
button. 94
Memory functionsSeats, steering wheel and mirrors

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 0
If you hear a warning tone when you leave the
vehicle, the lights may still be switched on.
X Turn the light switch to Ã.
Dipped-beam headlamps X
To switch on the dipped-beam head-
lamps: turn the key in the ignition lock to
position 2or start the engine.
X Turn the light switch to L.
The L indicator lamp in the instrument
cluster lights up.
Daytime driving lights You can activate or deactivate the daytime
driving lights function using the on-board
computer (Y page 201).
X Daytime driving lights: activate the day-
time driving lights function using the on-
board computer.
X Turn the light switch to Ã.
When the engine is on: depending on the
ambient light conditions, the daytime driv-
ing lights or the parking and dipped-beam
headlamps are switched on.
When the dipped-beam headlamps are
switched on, the Lindicator lamp in the
instrument cluster lights up.
Automatic headlamp mode G
WARNING
If the light switch is set to Ã, the dipped-
beam headlamps will not come on automati-
cally if it is foggy. This could endanger you and
others. Therefore, turn the light switch to
L in fog. The automatic headlamp feature is only an
aid. The driver is responsible for the vehicle's
lighting at all times.
X To switch on automatic headlamp
mode: turn the light switch to Ã.
Key in position 1in the ignition lock: the
side lamps are switched on or off automat-
ically depending on the brightness of the
ambient light.
With the engine running: depending on the
brightness of the ambient light, the daytime
driving lights 5
or the dipped-beam head-
lamps are switched on or off automatically.
When the dipped-beam headlamps are
switched on, the Lindicator lamp in the
instrument cluster lights up.
Front foglamps and rear foglamp Foglamps
Only vehicles with frontf
oglamps have the
"Foglamps" function. G
WARNING
If you suspect that driving conditions will be
foggy, turn the light switch to Lbefore you
start your journey. Your vehicle may other-
wise not be visible and you could endanger
yourself and others.
X To switch on the foglamps: turn the key
in the ignition lock to position 2or start the
engine.
X Turn the light switch to T,Lor
Ã.
X Press the Nbutton.
The green Nindicator lamp in the instru-
ment cluster lights up.
X To switch off the front foglamps: press
the N button.
The green Nindicator lamp in the instru-
ment cluster goes out.
5 Only if daytime driving lights have been activated via the on-board computer. Exterior lighting
97Lights and windscreen wipers Z

Main-beam headlamps
X
To switch on the main-beam head-
lamps: turn the key in the ignition lock to
position 2or start the engine.
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 K indicator lamp in the instrument
cluster lights up when the main-beam head-
lamps are switched on.
X To switch off the main-beam head-
lamps: move the combination switch back
to its normal position.
The K indicator lamp in the instrument
cluster goes out.
Headlamp flasher X
To switch on: turn the key in the ignition
lock to position 1or 2, or start the engine.
X Pull the combination switch in the direction
of arrow =. Hazard warning lamps The hazard warning lamps automatically
switch on if:
R
an airbag is deployed.
R the vehicle decelerates rapidly from a
speed of more than 70 km/h and comes to
a standstill.
X To switch on the hazard warnin glamps:
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 corre-
sponding side of the vehicle will flash.
X To switch off the hazard warning
lamps: press button :.
The hazard warning lamps switch off auto-
matically if the vehicle reaches a speed of
over 10 km/h again after a full brake appli-
cation.
i The hazard warning lamps still operate if
the ignition is switched off. Intelligen
tLight System
Important notes The Intelligent Light System is a syste
mthat
adjusts the headlamps automatically to suit
the prevailing driving and weather conditions.
It offers advanced functions for improved illu-
mination of the road surface, e.g. depending
on the vehicle speed or weather conditions.
The system includes the active light function,
cornering light 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" using the on-board computer
(Y page 201). Exterior lighting
99Lights and windscreen wipers Z

the illumination of the edge of the carriage-
way.
Active: if you are driving at speeds below
70 km/h and yo uswitch on the rear foglamp
Not active: if you are driving at speeds above
10 0k m/h or if you switch off the rear foglamp
following activation Adaptive Highbeam Assist
G
WARNING
Adaptive Highbeam Assist is only an aid
designed to assist driving. The driver is
responsible for adjusting the vehicle's lighting
to the prevailing light, visio nand traffic con-
ditions.
The system may be impaired or deactivated:
R if there is poor visibility, e.g .due to snow,
rain, fog or spray
R if the area of the windscree naround the
optical sensor is dirty, misted up or covered
up, e.g. by a sticker
The system may not recognise the following
road users:
R road users that have no lighting, e.g. pedes-
trians
R road users that have poor lighting, e.g.
cyclists
R road users whose lighting is not clearly visi-
ble, e.g. road users behind a crash barrier
R on rare occasions: road users that have
lights that may be recognised too late or not
at all
The automatic main-beam headlamps will not
be deactivated, or they may be activated
despite road users travelling in front of or
approaching the vehicle.
Thus, you could cause an accident and injure
yourself and others. Always observe traffic
conditions and, if necessary, dip the lights
manually.
You can use this function to set the head-
lamps to change between dipped beama ndmain beam automatically. The system recog-
nises vehicles with thei
rlights on, either
approaching fro mthe opposite direction or
travelling in front of your vehicle, and conse-
quently switches the headlamps from main
beam to dipped beam.
The system automatically adapts the dipped-
beam headlamp range depending on the dis-
tance to the other vehicle. Once the system
no longer detects any other vehicles, it reac-
tivates the main-beam headlamps.
The system's optical sensor is located behind
the windscreen near the overhead control
panel. X
To activate: activate the Adaptive High-
beam Assist function using the on-board
computer (Y page 202).
X Turn the light switch to Ã.
X Press the combination switch beyond the
pressure point in the direction of
arrow :(Ypage 98).
The _ indicator lamp in the multifunc-
tion display lights up if it is dark and the
light sensor activates the dipped-beam
headlamps.
If you are driving at speeds above
45 km/h: Exterior lighting
101Lights and windscreen wipers Z

Interior lighting control
Important notes In order to preven
tthe vehicle's battery from
discharging, the interior lighting functions are
automatically deactivated after some time
except for when the key is in position 2in the
ignition lock.
Automatic interior lighting control X
To switch on: set the switch to centre
position 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 igni-
tion lock. You can activate this delayed
switch-off using the on-board computer
(Y page 202).
Manual interior lighting control X
To switch the front interior lighting on:
set the switch to the cposition.
X To switch the front interior lighting off:
set the switch to the |position.
X To switch the rear interior lighting on/
off: press the ubutton.
X To switch the reading lamps on/off:
press the pbutton. 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
emergency 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. If you
touch the electrical contacts of a xenon bulb,
you could suffer an electric shock and be seri-
ously or even fatally injured. For this reason,
do not remove the cover of xenon bulbs.
Do not change the xenon bulbs yourself, but
have them replaced at a qualified 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 engine. For this to be
observed, the lights must be switched on
before starting the engine.
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.
Other bulbs G
WARNING
Bulbs and lamps can be very hot. You should
therefore allow them to cool down before you
change them. Otherwise, you could be burned
if you touch them.
Keep bulbs out of the reach of children. Oth-
erwise, they could damage the bulbs, for
example, and injure themselves. Replacing bulbs
103Lights and windscreen wipers
Z

X
Lightly press the corresponding bulb into
the holder, turn it anti-clockwise and
remove it from the bulb holder.
X Insert the corresponding new bulb into the
bulb holdera nd turnitclockwise.
X Attach the bulb holder and press firmly.
The retaining lugs on the bulb holder
engage audibly.
X Close the side trim panel (Y page 107).
Licence plate lighting X
Switch off the lights.
X Open the tailgate.
X Apply a screwdriver to lamp lens :from
the outside.
X Leve rout lamp lens :and remove it.
X Replace the bulb.
X Inser tlamp lens :into the licence plate
lamp and press it in until it engages. Windscreen wipers
Switching the windscreen wipers on/
off
G
WARNING
The windscree nwill not longer be wiped prop-
erly if the wiper blades are worn .This could
prevent you from observing the traffic condi-
tions, thereby causing an accident. Replace
the wiper blades twice a year, ideally in spring
and autumn. !
Do not operate the windscreen wipers
when the windscreen is dry, as this could
damage the wiper blades. Moreover, dust
that has collected on the windscreen can
scratch the glass if wiping takes place when
the windscreen is dry.
If it is necessary to switch on the wind-
screen wipers in dry weather conditions,
always operate them using washer fluid.
! 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. Cleant he
windscreen with washer fluid after an auto-
matic 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/ îTo wipe the
windscreen using washer fluid
X Turn the key to position 1or 2in the ignition
lock.
X Turn the combination switch to the corre-
sponding position.
! Vehicles with a rain sensor: if the wind-
screen becomes dirty in dry weather con-
ditions, the windscreen wipers may be acti-
vated inadvertently. This could damage the 108
Windscreen wipersLights and windscreen wipers

windscreen wiper blades or scratch the
windscreen.
For this reason, you should always switch
off the windscreen wipers in dry weather.
Vehicles with arain sensor: in theÄor
Å position, the appropriate wiping fre-
quency is automatically set according to the
intensity of the rain. In the Åposition, the
rai ns ensor is more sensitive than in
the Ä position, causing the windscreen
wipers to wipe more frequently. Switching the rear window wiper on/
off
Combination switch
:
è Switch
2 ô To wipe with washer fluid
3 ITo switch on intermittent wiping
4 0To switch off intermittent wiping
5 ô To wipe with washer fluid
X Turn the key to position 1or 2in the ignition
lock.
X Turn switch :on the combination switch
to the corresponding position.
When the rear window wiper is switched on,
the icon appears in the instrument cluster. Replacing the wiper blades
Important safety notes G
WARNING
The wiper arms could start moving and cause
an injury if you leave the windscreen wipers
switched on.
Remove the key from the ignition lock before
replacing 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 if a windscreen
wiper arm has been folded away from the
windscreen.
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 windscreen wiper arm without a wiper
blade and it falls onto the windscreen, the
windscreen may be damaged by the force
of the impact.
Mercedes-Benzr ecommends that you have
the wiper blades changed at aqualified
specialist workshop.
Replacing the windscreen wiper blades Removing the wiper blades
X
Remove the key from the ignition lock.
X Fold the wiper arm away from the wind-
screen. Windscreen wipers
109Lights and windscreen wipers Z

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 the new wiper blade :with
recess Bon 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
correctly.
X Fold the wiper arm back onto the wind-
screen.
Replacing the rear window wiper blade G
WARNING
The wiper arm could be set in motion and
injure you if the windscreen wipers are
switched on.
Remove the key from the ignition lock before
replacing the wiper blade. Removing the wiper blade X
Remove the key from the ignition lock.
X Fold wiper arm :away from the rear win-
dow until it engages.
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 the 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.
X Make sure that wiper blade ;is seated
correctly.
X Position wiper blade ;parallel to wiper
arm :.
X Fold wiper arm :back onto the rear win-
dow. Problems with the windscreen wipers
The windscreen wipers are obstructed Leaves or snow, for example, may be
obstructing the windscreen wiper movement.
The wiper motor has been deactivated.110
Windscreen wipersLights and windscreen wipers

Useful information
i This Owner's Manual describes all models
and all standard and optional equipment
available to your vehicle at the time of pub-
lication of the Owner's Manual. Country-
specific deviations are possible. Please
note that your vehicle may not be equipped
with all features described. This also
applies to safety-relevan tsystems and
functions.
i Please read the information on qualified
specialist workshops (Y page 22).Overview of climate control systems
Important safety notes
G
WARNING
Observe the settings recommended on the
following pages. The windows could other-
wise mis tup. This may preven tyou from
observing the traffic conditions, thereby caus-
ing an accident.
THERMATIC automatic climate control/
THERMOTRONIC automatic climate control
controls the temperature and the humidity of
the vehicle interior and filters out undesirable
substances from the air.
THERMATIC/THERMOTRONIC automatic cli-
mate control is only operational when the
engine is running 7
.O ptimum operation is only
achieved if you drive with the side windows
and panorama sliding sunroof closed.
i Ventilate the vehicle for a brief period
during warm weather, e.g. using the con-
venience opening feature (Y page 81). This
will speed up the cooling process and the
desired vehicle interior temperature will be
reached more quickly.
i The integrated filter can filter out most
particles of dust and completely filters out pollen.
Aclogged 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 it
depends on environmental conditions, e.g.
heavy air pollution, the interval may be
shorter than stated in the Service Booklet.
7 THERMOTRONIC automatic climate control: the residual heat function can only be activated/deactivated
when the ignition is switched off. 114
Overview of climate control systemsClimate control

the front-passenge
rside as well. The indi-
cator lamp in the ábutton goes out.
R Use the residual heat function if you want
to heat or ventilate the vehicle interior
when the ignition is switched off .The resid-
ual heat function can only be activated or
deactivated with the ignition switched off. Operating the climate control system
Switching climate control on/off
Switching on/off THERMATIC automatic climate control
X Turn the key to position 2in the ignition
lock.
X To switch on: turn controlAclockwise
to the desired position (except position 0)
(Y page 115).
X To switch off: turn controlAanti-clock-
wise to position 0(Y page 115).
THERMOTRONIC automatic climate con-
trol
X Turn the key to position 2in the ignition
lock.
X To activate: press theÃbutton.
The indicator lamp in the Ãbutton lights
up. Airflow and air distribution are set to
automatic mode.
or
X Press the ^button.
The indicator lamp in the ^button goes
out. The previously selected settings come
into effect again.
X To switch off: press the^button.
The indicator lamp in the ^button lights
up.
i If climate control is switched off, the air
supply and air circulation are also switched
off. Only use this setting for a brief period.
The windows could otherwise mist up. i
THERMOTRONIC automatic climate con-
trol: switch on climate control primarily
using the Ãbutton. Activating/deactivating the cooling
with air dehumidification function
Important information G
WARNING
If the "cooling with air dehumidification" func-
tion is deactivated, the air inside the vehicle
will not be cooled (during warm weather) or
dehumidified. The windows could mist up
more quickly. This may prevent you from
observing the traffic conditions, thereby caus-
ing an accident.
The cooling with air dehumidification function
is only available when the engine is running.
The air inside the vehicle is cooled and dehu-
midified according to the temperature selec-
ted.
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 mal-
function.
i The refrigerant that is used by the cooling
with air dehumidification does not contain
chlorofluorocarbons, and therefore does
not damage the ozone layer. You can obtain
more detailed information on refrigerants
from any qualified specialist workshop.
Switching on/off X
To activate: press the¿button.
The indicator lamp in the ¿button lights
up.
X To switch off: press the¿button.
The indicator lamp in the ¿button goes
out. The cooling with air dehumidification
function has a delayed switch-off feature. Operating the climate control system
117Climate control Z