engine MERCEDES-BENZ B-CLASS HATCHBACK 2011 Owner's Manual

EBD monitors and controls the brake pres-
sure on the rea rwheels to improve driving
stability while braking.
i Observe the "Important safety notes" sec-
tion (Y page 62). ADAPTIVE BRAKE
ADAPTIVE BRAKE enhances braking safety
and offers increased braking comfort.Ina ddi-
tion to the brakin gfunction ,ADAPTIVE BRAKE
also has the HOLD functio n(Ypage 162 )and
hill start assist (Y page 129). For further
information, see Driving tips (Y page 146).STEER CONTROL
G
WARNING
If there is an ESP ®
malfunction, you will not
receive any steering assistance from the
STEER CONTROL. The steering continues to
functio nwith power assistance.
STEER CONTROL helps you by transmitting a
noticeable steering force to the steering
wheel in the direction required for vehicle
stabilisation.
This steering assistance is provided in partic-
ular if:
R both right wheels or both left wheels are on
a wet or slippery road surface when you
brake.
R the vehicle starts to skid.
You have control over the steering at all
times. Anti-theft systems
Immobiliser
X To activate: remove the key fro mthe igni-
tion lock.
X To deactivate: switch on the ignition. The immobiliser prevents your vehicle from
being started without the correct key.
i
The immobiliser is always deactivated
when you start the engine. ATA (Anti-Theft Alarm system)
X
To prime: lock the vehicle with the key.
Indicator lamp :flashes. The alarm sys-
tem is primed after approximately
15 seconds.
X To deactivate: unlock the vehicle with the
key.
X To stop the alarm: insert the key into the
ignition lock.
The alarm is switched off.
or
X Press the %or& button on the key.
The alarm is switched off.
Av isual and audible alarm is triggered if the
alarm system is primed and you open:
R a door
R the vehicle with the emergency key ele-
ment
R the tailgate
R the bonnet
The alarm is not switched off, even if you
close the open door that has triggered it, for
example. 68
Anti-theft systemsSafety

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).Key
Important safety notes
G
WARNING
If children are lef tunsupervised in the vehicle,
they could:
R open a door from inside the vehicle at any
time, eve nifithas been locked
R start the vehicle using akey which has been
left in the vehicle
R release the parking brake
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time. G
WARNING
Do not attach any heavy or large key rings to
the key that is inserted in the ignition .Ifakey
ring is too heavy or too large, the weight acting
on the key could cause it to tur ninthe ignition
lock or catch on the steering wheel. This could
cause the engine to be switched off suddenly.
You could lose control of the vehicle and
cause an accident.
Do not use the key in the vicinity of strong
magnetic fields. Otherwise, the remote con-
trol function could be affected. Do not keep the key together with:
R
electronic devices, e.g. a mobile phone or
another key
R metallic objects, e.g. coins or metal foil Key functions
:
& To lock the vehicle
; % To unlock the vehicle
X To unlock centrally: press the%but-
ton.
If you do not open the vehicle within approx-
imately 40 seconds of unlocking:
R the vehicle is locked again.
R the anti-theft system is primed again.
X To lock centrally: press the&button.
The key centrally locks/unlocks:
R the doors
R the tailgate
R the fuel filler flap
When unlocking, the turn signals flash once.
When locking, they flash three times.
When it is dark, the surround lighting also
comes on if it is activated in the on-board
computer (Y page 202).
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated using
the on-board computer (Y page 203).72
KeyOpening and closing

Problems with the key
Problem Possible causes/consequences and
M Solutions
You cannot lock or
unlock the vehicle
using the key. The key battery is discharged or nearly discharged.
X
Try again to lock/unlock the vehicle using the remote control
function of the key. Point the tip of the key at the driver's door
handle from close range and press the %/& button.
If this does not work:
X Check the key battery and replace it if necessary (Y page 74).
X Lock (Y page 77) or unlock (Y page 78) the vehicle using
the emergency key element. The key is faulty.
X
Lock (Y page 77) or unlock (Y page 78) the vehicle using
the emergency key element.
X Have the key checked at a qualified specialist workshop. You have lost a key. X
Have the key deactivated at a qualified specialist workshop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. You have lost the emer-
gency key element. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. The engine cannot be
started using the key. The on-board voltage is too low.
X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 280).
or
X Jump-start the vehicle (Y page 283).
or
X Consult a qualified specialist workshop. The engine cannot be
started using the key. The steering lock is mechanically blocked.
X
Remove the key and reinsert it into the ignition lock. While doing
this, turn the steering wheel in both directions. Key
75Opening and closing Z

the switch or pull the switch upwards to close
the side window again.
G
WARNING
Make sure tha tnobody can become trapped
as you close a side window. If there is a risk
of becoming trapped, release the switch or
press it again to open the side window again. G
WARNING
Children may injure themselves if they open
or close the side windows.
Never leave children unsupervised in the vehi-
cle. Always take the key with you when leaving
the vehicle, even if you are only leaving it for
a short time. G
WARNING
Do not leave children unsupervised in the
vehicle, even if they are secured in a child
restraint system. The children could:
R be seriously or even fatally injured on parts
of the vehicle
R be seriously or even fatally injured by pro-
longed exposure to extremely high or
extremely low temperatures
If children open a door, they could:
R seriously or even fatally injure other people
R get out of the vehicle and injure them-
selves, or be seriously or even fatally
injured by a passing vehicle
Activate the child-proof locks/override fea-
ture if children are travelling in the vehicle.
They could otherwise open doors or side win-
dows while the vehicle is in motion and
thereby injure themselves or others. Opening and closing the side win-
dows
:
Front left
; Front right
= Rear right
? Rear left
The switches for all side windows are located
on the driver's door. There is also a switch on
each door for the corresponding side window.
The switches on the driver's door take prec-
edence.
i The side windows cannot be operated
from the rear when the override feature for
the side windows is activated (Y page 62).
X Turn the key to position 1or 2in the ignition
lock.
X To open: press the corresponding switch.
X To close: pull the corresponding switch.
i If you press the switch beyond the point
of resistance, an automatic opening/clos-
ing process is started in the corresponding
direction .You can stop automatic opera-
tion by pressing again.
i You can continue to operate the side win-
dows after switching off the engine or
removing the key. This function remains
active for five minutes or until the driver's
or front-passenger door is opened. 80
Side windowsOpening and closing

Operating the panorama sliding sun-
roof
Opening and closing Overhead control panel
:
To raise
; To open
= To close/lower
X Turn the key to position 1or 2in the ignition
lock.
X Press or pull the 3switch in the corre-
sponding direction.
i If you press the 3switch beyond the
point of resistance, an automatic opening/
closing process is started in the corre-
sponding direction. You can stop automatic
operation by pressing again.
i You can continue to operate the pano-
rama sliding sunroof after switching off the
engine or removing the key. This function
remains active for five minutes or until you
open a front door.
Rain-closing feature The rain-closing feature is only available for
vehicles with a rain sensor.
When the key is in position 0in the ignition
lock or is removed, the panorama sliding sun-
roof closes automatically:
R if it starts to rain
R at extreme outside temperatures
R after six hours
R if there is a malfunction in the power supply The panorama sliding sunroof remains raised
at the rear in order to allow ventilation of the
vehicle interior.
i If the panorama sliding sunroof is obstruc-
ted when being closed by the rain-closing
feature, it opens again slightly. The rain-
closing feature is then deactivated.
The panorama sliding sunroof does not close
if:
R it is raised at the rear.
R it is blocked.
R no rain is falling on the area of the wind-
screen being monitored by the rain sensor,
e.g. because the vehicle is under a bridge. Operating the panorama sliding sun-
roof roller sunblinds
Important safety notes G
WARNING
Make sure that nobody can become trapped
as you open or close the roller sunblinds.
The roller sunblinds shield the vehicle interior
from sunlight. The two roller sunblinds can
only be opened and closed together when the
panorama sliding sunroof is closed.
Opening and closing Overhead control panel
:
To open
; To open
= To close Sliding sunroof
83Opening and closing Z

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

Rear foglamp
X To switch on the rear foglamp: turn the
key in the ignition lock to position 2or start
the engine.
X Turn the light switch to LorÃ.
X Press the Rbutton.
The yellow Rindicator lamp in the
instrument cluster lights up.
X To switch off the rear foglamp: press the
R button.
The yellow Rindicator lamp in the
instrument cluster goes out.
Vehicles with front foglamps: when the light
switch is in the Tposition, the rea rfog-
lamp can only be switched on if the foglamps
(without dipped-beam headlamps) are
switched on.
Adjusting the headlam prange (halogen
headlamps) The headlamp range control allows you to
adjust the cone of light from the headlamps
to sui tthe vehicle load. Headlamp range control
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 compart-
ment laden
3 Driver's and front-passenger seats occu-
pied and maximum permissible rear axle
load utilised, e.g. when towing a trailer X
Start the engine.
X Turn the headlamp range control to the
position which corresponds to the load in
your vehicle.
Headlampc leaning system The headlamps are cleaned automatically if
the "Wipe with washer fluid" function is oper-
ated five times while the lights are on and the
engine is running (Y
page 108). When you
switch off the ignition, the automatic head-
lamp cleaning syste mis reset and counting is
resumed from 0. 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?. 98
Exterior lightingLights and windscreen wipers

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

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

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