2015 MERCEDES-BENZ B-CLASS HATCHBACK engine

Warning displays
:
Segments on the left-hand side of the vehi-
cle
; Segments on the right-hand side of the vehi-
cle
= Segments showing operational readiness
The warning displays show the distance
between the sensors and the obstacle. The
warning display for the front area is located on
the dashboard above the centre air vents. The
warning display for the rear area is located on
the roof lining in the rear compartment.
The warning display for each side of the vehicle
is divided into five yellow and two red segments.
PARKTRONIC is operational if yellow segments
showing operational readiness =light up.
The transmission position of the automatic
transmission and the direction in which the vehi-
cle is rolling determine which warning display is active when the engine is running. Transmission posi-
tion Warning display
D
Front area activated
R,
Nor the vehicle is
rolling backwards Rear and front areas
activated
P
No areas activated
One or more segments light up as the vehicle
approaches an obstacle, depending on the vehi-
cle's distance from the obstacle.
From the:
R sixth segment onwards, you will hear an inter-
mittent warning tone for approximately two
seconds.
R seventh segment onwards, you will hear a
warning tone for approximately two seconds. This indicates that you have now reached the
minimum distance.
Deactivating/activating PARKTRONIC :
Indicator lamp
; To deactivate/activate PARKTRONIC
If indicator lamp :lights up, PARKTRONIC is
deactivated.
i PARKTRONIC is automatically activated
when you turn the key to position 2in the
ignition lock. Driving systems
157Driving and parking Z

X
Start the engine.
X Release the electric parking brake.
X Switch on the turn signal in the direction you
will drive out of the parking space.
X Shift the transmission to position Dor R.
The Start Park Assist? Yes: OK No:
Start Park Assist? Yes: OK No:
message appears in the multifunction display %.
X To cancel the procedure: press the%
button on the multifunction steering wheel or
pull away.
or X To exit a parking space using Active Park-
ing Assist: press theabutton on the mul-
tifunction steering wheel.
The Park Assist active Accelerate
Park Assist active Accelerate
and brake Observe surroundings
and brake Observe surroundings mes-
sage appears in the multifunction display.
X Release the multifunction steering wheel.
X Pull away, being ready to brake at all times. Do
not exceed a maximum speed of approx-
imately 10 km/h when exiting a parking
space. Otherwise, Active Parking Assist will
be cancelled.
X Stop when PARKTRONIC sounds the contin-
uous warning tone, if not before.
X Depending on the message or as required,
shift the transmission to position Dor R.
Active Parking Assist immediately steers in
the other direction. The Park Assist Park Assist
active
active Accelerate
Accelerate and
andbrake
brake Observe
Observe
surroundings
surroundings message appears in the mul-
tifunction display.
i You will achieve the best results by waiting
for the steering procedure to complete before
pulling away.
If you reverse after activation, the steering
wheel is moved to the straight-ahead posi-
tion.
X Drive forwards and reverse as prompted by
the PARKTRONIC warning displays, several
times if necessary.
X Stop when PARKTRONIC sounds the contin-
uous warning tone, if not before.
Once you have exited the parking space com-
pletely, the steering wheel is moved to the
straight-ahead position. You hear a tone and the
Park
Park Assist
Assist switched switched off
offmessage appears
in the multifunction display. You will then have
to steer and merge into traffic on your own.
PARKTRONIC is still available. You can take over the steering before the vehicle has exited the
parking space completely. This is useful, for
example, when you recognise that it is already
possible to pull out of the parking space.
Cancelling Active Parking Assist X
Stop the movement of the multifunction
steering wheel or steer yourself.
Active Parking Assist will be cancelled at
once. The Park Assist cancelled
Park Assist cancelled mes-
sage appears in the multifunction display.
or
X Press the PARKTRONIC button (Y page 157).
PARKTRONIC is switched off and Active Park- ing Assist is immediately cancelled. The
Park Assist cancelled Park Assist cancelled message appears
in the multifunction display.
Active Parking Assist is cancelled automatically
if:
R the electric parking brake is applied
R transmission position Pis selected
R parking using Active Parking Assist is no lon-
ger possible
R you are driving faster than 10 km/h
R a wheel spins and ESP ®
intervenes or fails.
The ÷ warning lamp lights up in the instru-
ment cluster.
A warning tone sounds. The parking symbol dis-
appears and the multifunction display shows the
Park Assist cancelled Park Assist cancelled message.
When Active Parking Assist is cancelled, you
must steer and brake again yourself.
If a system malfunction occurs, the vehicle is
braked to a standstill. To drive on, depress the
accelerator pedal again. Driving systems
161Driving and parking Z

:
Red guide line at a distance of approximately
0.30 m from the rear of the vehicle
; White guide line without turning the steering
wheel
= End of parking space
X Reverse carefully until you have reached the
end position.
Red guide line :is then at the end of parking
space =. The vehicle is almost parallel in the
parking space.
Wide-angle function :
Symbol for the wide-angle view function
; Own vehicle
= PARKTRONIC warning displays
Select this view when you are driving out of an
exit and the view of crossing traffic is restricted, for example. ATTENTION ASSIST
General notes ATTENTION ASSIST helps you during long,
monotonous journeys such as on motorways
and trunk roads. It is active in the 60 km/h to
200 km/h speed range. If ATTENTION ASSIST detects typical indicators of fatigue or increas-
ing lapses in concentration on the part of the
driver, it suggests taking a break.
Important safety notes ATTENTION ASSIST is only an aid. It may not
always detect fatigue or lapses in concentration
until too late, or may not detect them at all. The system is not a substitute for a well-rested and
attentive driver.
The functionality of ATTENTION ASSIST is
restricted, and warnings may be delayed or not
occur at all:
R if the length of the journey is less than approx-
imately 30 minutes
R if the road condition is poor, e.g. if the surface
is uneven or if there are potholes
R if there is a strong side wind
R if you have adopted a sporty driving style with
high cornering speeds or high rates of accel-
eration
R if you are predominantly driving at a speed
below 60 km/h or above 200 km/h
R if the time has been set incorrectly
R in active driving situations, such as when you
change lanes or change your speed
ATTENTION ASSIST is reset and starts assessing
your tiredness again when you continue your
journey if:
R you switch off the engine
R you take off your seat belt and open the driv-
er's door, e.g. for a change of drivers or to
take a break
Displaying the attention level You can have current status information dis-
played in the assistance menu (Y
page 182) of
the on-board computer. Driving systems
165Driving and parking Z

X
Select the assistance graphics display for
ATTENTION ASSIST using the on-board com-
puter (Y page 182).
The following information is displayed:
R the length of the journey since the last break
R the attention level determined by ATTENTION
ASSIST ( Attention level
Attention level), displayed in a
bar display in five levels from high to low
R if ATTENTION ASSIST is unable to calculate
the attention level and cannot issue a warn-
ing, the System suspended
System suspended message
appears. The bar display then changes the
display, e.g. if you are driving at a speed below 60 km/h or above 200 km/h.
Activating ATTENTION ASSIST X
Activate ATTENTION ASSIST using the on-
board computer (Y page 183).
The system determines the attention level of
the driver depending on the setting selected:
If Standard
Standard is selected: the sensitivity with
which the system determines the attention level
is set to normal.
If Sensitive Sensitive is selected: the sensitivity is set
higher. The attention level detected by ATTEN-
TION ASSIST is adapted accordingly and the
driver is warned earlier.
When ATTENTION ASSIST is deactivated, the
é symbol appears in the multifunction dis-
play in the assistance graphic display.
When ATTENTION ASSIST has been deactivated, it is automatically reactivated after the engine
has been switched off. The sensitivity selected
corresponds to the last selection activated
(standard/sensitive).
Warning in the multifunction display If fatigue or increasing lapses in concentration
are detected, a warning appears in the multi-
function display:
ATTENTION ASSIST ATTENTION ASSIST Take a
Take a
break!
break!.
In addition to the message shown in the multi-
function display, you will then hear a warning
tone.
X If necessary, take a break.
X Confirm the message by pressing the a
button on the steering wheel.
On long journeys, take regular breaks in good
time that allow for adequate recuperation. If you do not take a break and ATTENTION ASSIST still detects increasing lapses in concentration, you
will be warned again after 15 minutes at the
earliest. This will only happen if ATTEN-
TION ASSIST still detects typical indicators of
fatigue or increasing lapses in concentration.
If a warning is output in the multifunction dis-
play, a service station search is performed in
COMAND Online. You can select a service sta-
tion and navigation to this service station will
then begin. This function can be activated and
deactivated in COMAND Online. Traffic Sign Assist
General notes Traffic Sign Assist displays the maximum speed
permitted and overtaking restrictions to the
driver in the instrument cluster. Driving onto a
section of road in the wrong direction triggers a
warning. Traffic Sign Assist detects traffic signs with multifunction camera :attached at the
top of the windscreen. The data and general
traffic regulations stored in the navigation sys-
tem are also used to determine the current
speed limit.
If a traffic sign that is relevant to your vehicle is passed, the display of the speed limits and over-
taking restrictions is updated.
The display can also be updated without a visible traffic sign if:
R the vehicle changes roads (e.g. motorway exit
or slip road)
R a village or town boundary is passed which is
stored in the digital map
R the last traffic sign detected by the camera
has not been repeated
If a sign indicating the end of a restriction (speed limit or overtaking restriction) is passed, the
sign is displayed for five seconds. The currently 166
Driving systemsDriving and parking

Display messages
Possible causes/consequences and
M
MSolutions ì
Malfunction Visit Malfunction Visit
workshop workshop Malfunctions are present in the drive system and/or in the cooling
system.
X Consult a qualified specialist workshop immediately. Without starting Without starting
engine again, con‐ engine again, con‐
sult workshop sult workshop The vehicle's high-voltage electrical system is malfunctioning. A warn-
ing tone also sounds.
X Do not switch off the drive system.
X Consult a qualified specialist workshop immediately. ì
Stop Switch engine Stop Switch engine
off off There is a serious malfunction in the drive system. A warning tone also
sounds.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Do not tow the vehicle.
X Consult a qualified specialist workshop immediately. Driving systems
Display messages
Possible causes/consequences and
M MSolutions À
Attention Assist: Attention Assist:
Take a break! Take a break! Based on certain criteria, ATTENTION ASSIST has detected fatigue or
a lack of concentration on the part of the driver. A warning tone also
sounds.
X If necessary, take a break.
During long journeys, take regular breaks in good time so that you get
enough rest. À
Attention Assist Attention Assist
inoperative inoperative ATTENTION ASSIST is inoperative.
X Consult a qualified specialist workshop. ë
Off Off The HOLD function is deactivated. The vehicle is skidding.
A warning tone also sounds.
X Reactivate the HOLD function later (Y page 154). The HOLD function is deactivated. When the brake pedal is firmly
depressed, an activation condition is not fulfilled.
A warning tone also sounds.
X Check the activation conditions for the HOLD function
(Y page 154). Display
messages
205On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions Tyre
Tyre
press.
press. monitor
monitor
currently unavaila‐
currently unavaila‐
ble ble No signals can be received from the tyre pressure sensors due to
strong RF interference. The tyre pressure monitor is temporarily mal-
functioning.
X Drive on.
The tyre pressure monitor restarts automatically as soon as the
cause has been rectified. Wheel sensor(s) Wheel sensor(s)
missing missing There is no signal from the tyre pressure sensor of one or several
wheels. The pressure of the affected tyre is not displayed in the mul-
tifunction display.
X Have the faulty tyre pressure sensor replaced at a qualified spe-
cialist workshop. Tyre Tyre
press.
press. monitor
monitor
inoperative No
inoperative No
wheel sensors wheel sensors The wheels fitted do not have suitable tyre pressure sensors. The tyre
pressure monitor is deactivated.
X Fit wheels with suitable tyre pressure sensors.
The tyre pressure monitor is activated automatically after driving for
a few minutes. Tyre Tyre
press.
press. monitor
monitor
inoperative
inoperative The tyre pressure monitor is faulty.
X Consult a qualified specialist workshop. Vehicle
Display messages
Possible causes/consequences and
M
MSolutions Depress brake to
Depress brake to
start engine start engine You have attempted to start the drive system with the transmission in
position Nwithout depressing the brake pedal.
X Depress the brake pedal. To shift out of P
To shift out of P
or or
N,
N,depress
depress brake
brake
and start engine
and start engine You have attempted to shift the transmission to position
Ror Dwith-
out starting the drive system.
X Start the drive system.
X Depress the brake pedal.
i It is only possible to shift the transmission from position
Pto the
desired position if you depress the brake pedal. Only then can the
parking lock be deactivated. If you do not depress the brake pedal,
the DIRECT SELECT lever can still be moved but the parking lock
remains engaged.
i At transmission fluid temperatures below
Ò20†you can only shift
out of position Pinto another transmission position when the
engine is running. Apply
Apply
brake
braketo
todese‐
dese‐
lect Park (P) posi‐
lect Park (P) posi‐
tion tion You have attempted to shift the transmission to position
R,Nor D
without depressing the brake pedal.
X Depress the brake pedal. 210
Display messagesOn-board computer and displays

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). Engine compartment
Bonnet
Important safety notes G
WARNING
An unlocked bonnet may open up when the
vehicle is in motion and block your view. There is a risk of an accident.
Never unlock the bonnet when driving. Before
every trip, ensure that the bonnet is locked. G
WARNING
When being opened and closed, the bonnet
may suddenly fall into the closed position.
There is a risk of injury to persons in the range of movement of the bonnet.
Open and close the bonnet only when nobody
is in the range of movement. G
WARNING
Certain components in the engine compart-
ment may be very hot, e.g. the drive system
and radiator. When carrying out work in the
engine compartment there is a risk of injury.
If possible, let the drive system cool down and only touch the components described in the
following. G
WARNING
There are moving components in the engine
compartment. Certain components may con-
tinue to move or suddenly move again even after the ignition has been switched off, e.g.
the radiator fan. There is a risk of injury.
If you have to carry out work in the engine
compartment:
R switch off the ignition
R never touch the dangerous areas surround-
ing moving components, e.g. the rotation
area of the fan
R remove jewellery and watches
R keep items of clothing and hair, for exam-
ple, away from moving parts.
Opening the bonnet G
WARNING
Certain components in the engine compart-
ment may be very hot, e.g. the drive system
and radiator. When carrying out work in the
engine compartment there is a risk of injury.
If possible, let the drive system cool down and only touch the components described in the
following. G
WARNING
When the bonnet is open, and the windscreen wipers are set in motion, you can be injured by
the wiper linkage. There is a risk of injury.
Always switch off the windscreen wipers and
the ignition before opening the bonnet.
! Make sure that the windscreen wipers are
not folded away from the windscreen. Other-
wise, you could damage the windscreen wip-
ers or the bonnet. Engine compartment
239Maintenance and care Z

X
Make sure that the windscreen wipers are
switched off.
X Pull release lever :on the bonnet.
The bonnet is released. X
Reach into the gap between the bonnet and
the radiator trim and press bonnet catch
lever ;to the left.
X Raise the bonnet. X
Pull support strut ?out of bracket A.
X Lift up support strut ?and insert it into yel-
low retaining clip =.
Closing the bonnet X
Raise the bonnet slightly and, at the same
time, remove support strut ?from yellow
retaining clip =.
X Swing support strut ?down and press it into
bracket Auntil it engages.
X Lower the bonnet and let it fall from a height
of approximately 20 cm.
X Check that the bonnet has engaged properly.
If the bonnet can be raised slightly, it is not
properly engaged. Do not press the bonnet
closed. Open the bonnet again and close it
with a little more force. Checking and adding other service
products
Checking the coolant level G
WARNING
The cooling system is pressurised, particu-
larly when the engine is warm. If you open the cap, you could be scalded if hot coolant
sprays out. There is a risk of injury.
Let the engine cool down before you open the
cap. Wear gloves and eye protection. Open
the cap slowly to release the pressure.
! The coolant level must only be checked and
corrected when the engine has cooled down
(coolant temperature under 40 †). Checking
the coolant level when the coolant tempera-
ture is over 40 † can lead to damage to the
engine or engine cooling system. X
Park the vehicle on a level surface.
Only check the coolant level when the vehicle
is on a level surface and the drive system has
cooled down.
X Turn the key to position 2in the ignition lock
(Y page 126).
X Check the coolant temperature display in the
instrument cluster.
The coolant temperature must be below
40 †.
X Turn the key to position 0in the ignition lock
(Y page 126).
X Slowly turn cap :anti-clockwise to allow
excess pressure to escape.
X Turn cap :further anti-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the filler neck when cold, there is enough
coolant in coolant expansion tank ;.240
Engine compartmentMaintenance and care