warning MERCEDES-BENZ B-Class 2017 W246 Workshop Manual

Doors
Important safety notes
G
WARNING
If children are left unsupervised in the vehicle, they could:
R open the doors, thus endangering other
people or road users.
R get out and disrupt traffic.
R operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
R release the parking brake.
R shift the transmission out of park position P
R start the vehicle's drive system.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
You should preferably place luggage or loads in
the cargo compartment. Observe the loading
guidelines (Y page 207). Unlocking and opening doors from
the inside X
To unlock and open a front door: pull door
handle 0044.
If the door is locked, locking knob 0043pops up.
The door is unlocked and opens.
X To unlock a rear door: pull up locking
knob 0043.
The door is unlocked and can be opened.
X To open a rear door: pull door handle0044.
You can open a door from inside the vehicle
even if it has been locked. You can only open the rear doors from inside the vehicle if they are not
secured by the child-proof locks (Y page 58).
If the vehicle has previously been locked with
the SmartKey from the outside, opening a door
from the inside will trigger the anti-theft alarm
system. Switch off the alarm (Y page 65). Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle from
the inside. This can be useful if you wish to lock the vehicle before pulling away, for example. X
To unlock: press button 0043.
X To lock: press button 0044.
If all the doors and the tailgate are closed, the
vehicle locks.
This does not lock or unlock the charge socket
flap.
You cannot unlock the vehicle centrally from the
inside if the vehicle has been locked with the
SmartKey or KEYLESS-GO.
You can open a door from inside the vehicle
even if it has been locked. You can open the rear
doors from inside the vehicle unless they are
secured by the child-proof lock (Y page 58).
If the vehicle has previously been locked with
the SmartKey from the outside, opening a door 72
DoorsOpening and closing

X
Take the mechanical key out of the SmartKey
(Y page 68).
X Insert the mechanical key into the lock of the
driver's door as far as it will go. X
Turn the mechanical key clockwise as far as it
will go to position 0047.
X Turn the mechanical key back and remove it.
X Make sure that the doors and the tailgate are
locked.
X Insert mechanical key into the SmartKey
(Y page 68).
i If you lock the vehicle as described above,
the socket flap is not locked. The anti-theft
alarm system is not armed. Cargo compartment
Important safety notes
G
WARNING
If objects, luggage or loads are not secured or not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is a risk of injury, particu-
larly in the event of sudden braking or a sud-
den change in direction.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey.
! The tailgate swings upwards and to the rear
when opened. Therefore, make sure that
there is sufficient clearance above and behind
the tailgate. The opening dimensions of the tailgate can be
found in the "Vehicle data" section
(Y
page 286).
You should preferably place luggage or loads in the cargo compartment. Observe the loading
guidelines (Y page 207).
Do not leave the SmartKey in the cargo com-
partment. You could otherwise lock yourself
out.
The tailgate can be:
R opened and closed manually from outside
R released with the emergency release from the
inside Opening/closing from outside
Opening X
Press the 0036button on the SmartKey.
X Pull handle 0043.
X Raise the tailgate.
Closing 74
Cargo compartmentOpening and closing

X
Pull the tailgate down using handle 0043.
X Allow the tailgate to drop into the lock.
X If necessary, lock the vehicle with the 0037
button on the SmartKey or with KEYLESS-GO. Tailgate emergency release
General notes !
The tailgate swings upwards and to the rear
when opened. Therefore, make sure that
there is sufficient clearance above and behind
the tailgate.
The opening dimensions of the tailgate can be
found in the "Vehicle data" section
(Y page 286).
If the tailgate can no longer be unlocked:
R using the SmartKey, or
R using the remote operating switch in the door
control panel:
Use the emergency release on the inside of the tailgate.
You can reach the emergency release via the
cargo compartment.
Opening X
Remove cargo compartment cover
(Y page 213).
X Fold the rear seat backrest forwards
(Y page 211).
X Take the mechanical key out of the SmartKey
(Y page 68).
X Insert mechanical key 0044into opening 0043in
the trim and push it in.
X Open the tailgate.
X Insert the mechanical key into the SmartKey
(Y page 68). Side windows
Important safety notes
G
WARNING
While opening the side windows, body parts
could become trapped between the side win- dow and the door frame as the side window
moves. There is a risk of injury.
Make sure that nobody touches the side win-
dow during the opening procedure. If some-
body becomes trapped, release the switch or pull the switch to close the side window again. G
WARNING
While closing the side windows, body parts in the closing area could become trapped. There is a risk of injury.
When closing make sure that no parts of the
body are in the closing area. If somebody
becomes trapped, release the switch or press
the switch to open the side window again. G
WARNING
If children operate the side windows they
could become trapped, particularly if they are left unsupervised. There is a risk of injury.
Activate the override feature for the rear side
windows. When leaving the vehicle, always
take the SmartKey with you and lock the vehi-
cle. Never leave children unsupervised in the
vehicle. Side window reversing feature
The side windows are equipped with an auto-
matic reversing feature. If a solid object blocks
or restricts a side window from traveling
upwards during the automatic closing process,
the side window opens again automatically. Dur-
ing the manual closing process, the side window only opens again automatically after the corre-
sponding switch is released. The automatic
reversing feature is only an aid and is no substi-
tute for your attention when closing a side win-
dow. Side windows
75Opening and closing Z

G
WARNING
The reversing feature does not react:
R to soft, light and thin objects, e.g. small fin-
gers
R while resetting
This means that the reversing feature cannot
prevent someone being trapped in these sit-
uations. There is a risk of injury.
Make sure that no body parts are in close
proximity during the closing procedure. If
someone becomes trapped, press the switch
to open the side window again. Opening and closing the side win-
dows
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 prece-
dence. 0043
Front left
0044 Front right
0087 Rear right
0085 Rear left
X Turn the SmartKey to position 1or 2in the
ignition lock (Y page 109).
X To open manually: press and hold the cor-
responding switch.
X To open fully: press the switch beyond the
point of resistance and release it.
Automatic operation is started.
X To close manually: pull the corresponding
switch and hold it. X
To close fully: pull the switch beyond the
point of resistance and release it.
Automatic operation is started.
X To interrupt automatic operation: press/
pull the corresponding switch again.
i If you press/pull the switch beyond the
point of resistance, automatic operation is
started in the corresponding direction. You
can stop automatic operation by pressing/
pulling the switch again.
i You can continue to operate the side win-
dows after switching off the drive system or
removing the SmartKey. This function is avail- able for up to five minutes or until the driver's
or front-passenger door is opened.
i When the override feature for the side win-
dows is activated (Y page 58), the side win-
dows cannot be operated from the rear. Convenience opening
Vehicles with KEYLESS-GO or the Exclusive package: you can ventilate the vehicle before
you start driving.
The SmartKey can also be used to carry out the following functions simultaneously:
R unlock the vehicle
R open the side windows
The convenience opening feature can only be
operated using the SmartKey.
The "convenience opening" feature is also avail-
able when the vehicle is unlocked.
X Vehicles with the Exclusive package but
without KEYLESS-GO:
for the following
operations, point the tip of the SmartKey at
the door handle on the driver's door. The
SmartKey must be close to the driver's door
handle.
i Vehicles with KEYLESS-GO:
the SmartKey
must be in close proximity to the vehicle.
X Press and hold the 0036button until the side
windows reach the desired position.
X To interrupt convenience opening: release
the 0036 button. 76
Side windowsOpening and closing

Convenience closing feature
Important safety notes G
WARNING
When using the convenience closing feature,
parts of the body could be trapped in the clos- ing area when a side window is being closed. There is a risk of injury.
Observe the complete closing procedure
when the convenience closing feature is oper-
ating. Make sure that no body parts are in
close proximity during the closing procedure.
Vehicles with KEYLESS-GO or the Exclusive package: when you lock the vehicle, you can
close the side windows at the same time.
i Notes on the automatic reversing feature for
the side windows (Y page 75).
Using the SmartKey X
Vehicles with the Exclusive package but
without KEYLESS-GO: for the following
operations, point the tip of the SmartKey at
the door handle on the driver's door. The
SmartKey must be close to the driver's door
handle.
i Vehicles with KEYLESS-GO:
the SmartKey
must be in close proximity to the vehicle.
X Press and hold the 0037button until the side
windows are fully closed.
X To interrupt convenience closing: release
the 0037 button.
Using KEYLESS-GO The driver's door and the door at which the han-
dle is used, must both be closed. The SmartKey
must be outside the vehicle. The gap between
the SmartKey and the corresponding door han-
dle should not be greater than 3 ft (1 m). X
Touch recessed sensor surface 0043on the
door handle until the side windows are fully
closed.
i Make sure you only touch recessed sensor
surface 0043.
X Make sure that all the side windows are
closed.
X To interrupt convenience closing: release
recessed sensor surface 0043on the door han-
dle. Resetting the side windows
If a side window can no longer be closed fully,
you must reset it.
X Close all the doors.
X Turn the SmartKey to position 1or 2in the
ignition lock (Y page 109).
X Pull the corresponding switch on the door
control panel until the side window is com-
pletely closed (Y page 76).
X Hold the switch for an additional second.
If the side window opens again slightly: X Immediately pull the corresponding switch on
the door control panel until the side window is completely closed (Y page 76).
X Hold the switch for an additional second.
X If the respective side window remains closed
after the button is released, then it has been
set correctly. If this is not the case, repeat the
steps above again. Side windows
77Opening and closing Z

Problems with the side windows
G
WARNING
If you close a side window again immediately after it has been blocked or reset, the side window
closes with increased or maximum force. The reversing feature is then not active. Parts of the
body could be trapped in the closing area in the process. This poses an increased risk of injury or even fatal injury.
Make sure that no parts of the body are in the closing area. To stop the closing process, releasethe switch or push the switch again to reopen the side window. Problem
Possible causes/consequences and
0050 0050Solutions A side window cannot be
closed because it is
blocked by objects, e.g.
leaves in the window
guide. X
Remove the objects.
X Close the side window. A side window cannot be
closed and you cannot
see the cause. If a side window is obstructed during closing and reopens again
slightly:
X Immediately after the window blocks, pull the corresponding switch
again until the side window has closed.
The side window is closed with increased force.
If a side window is obstructed again during closing and reopens again slightly:
X Immediately after the window blocks, pull the corresponding switch
again until the side window has closed.
The side window is closed without the automatic reversing feature. 78
Side windowsOpening and closing

Correct driver's seat position
G
WARNING
You could lose control of your vehicle if you do the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the vehicle's drive system. Observe the following when adjusting steering
wheel
0043, seat belt 0044and driver's seat 0087:
R you are as far away from the driver's air bag as
possible
R you are sitting in a normal upright position
R your thighs are slightly supported by the seat
cushion
R your legs are not entirely stretched and you
can depress the pedals properly
R the back of your head is supported at eye level
by the center of the head restraint
R you can hold the steering wheel with your
arms slightly bent
R you can move your legs freely
R you can see all the displays in the instrument
cluster clearly R
you should have a good overview of traffic
conditions
R the seat belt is pulled snugly against the body
and is routed across the center of your shoul-
der and across your hips in the pelvic area
Further related subjects:
R Adjusting the seats electrically
(Y page 80)
R Adjusting the steering wheel manually
(Y page 83)
R Fastening the seat belt correctly
(Y page 42)
R Adjusting the rear-view mirror and exterior
mirrors (Y page 84)
R Vehicles with a memory function: saving
the seat, steering wheel and exterior mirror
settings using the memory function
(Y page 85) Seats
Important safety notes
G
WARNING
Children could become trapped if they adjust the seats, particularly when unattended.
There is a risk of injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Neverleave children unsupervised in the vehicle.
The seats can still be adjusted when there is no
SmartKey in the ignition lock. G
WARNING
When you adjust a seat, you or other vehicle
occupants could become trapped, e.g. on the seat guide rail. There is a risk of injury.
Make sure when adjusting a seat that no one
has any body parts in the sweep of the seat.
Observe the safety notes on "Air bags"
(Y page 43) and "Children in the vehicle"
(Y page 52). G
WARNING
If the driver's seat is not engaged, it could
move unexpectedly while the vehicle is in Seats
79Seats, steering wheel and mirrors
Z

motion. This could cause you to lose control of
the vehicle. There is a risk of an accident.
Always make sure that the driver's seat is
engaged before starting the vehicle. G
WARNING
You could lose control of your vehicle if you do the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the vehicle's drive system. G
WARNING
If you adjust the seat height carelessly, you or other vehicle occupants could be trapped andthereby injured. Children in particular could
accidentally press the electrical seat adjust-
ment buttons and become trapped. There is a
risk of injury.
While moving the seats, make sure that your
hands or other body parts do not get under the
lever assembly of the seat adjustment sys-
tem.
! To avoid damage to the seats and the seat
heating, observe the following information:
R keep liquids from spilling on the seats. If
liquid is spilled on the seats, dry them as
soon as possible.
R if the seat covers are damp or wet, do not
switch on the seat heating. The seat heat-
ing should also not be used to dry the seats.
R clean the seat covers as recommended;
see the "Interior care" section.
R do not transport heavy loads on the seats.
Do not place sharp objects on the seat
cushions, e.g. knives, nails or tools. The
seats should only be occupied by passen-
gers, if possible.
R when the seat heating is in operation, do
not cover the seats with insulating materi-
als, e.g. blankets, coats, bags, seat covers,
child seats or booster seats. !
Make sure that there are no objects in the
footwell under or behind the seats when mov-
ing the seats back. There is a risk that the
seats and/or the objects could be damaged.
i Further related subjects:
R cargo compartment enlargement (folding
down the rear seats) (Y page 211) Adjusting the seats electrically
0043
Seat height
0044 Seat cushion angle
0087 Seat fore-and-aft adjustment
0085 Backrest angle
i You can store the seat settings using the
memory function (Y page 85). Adjusting the head restraints
Important safety notes G
WARNING
You could lose control of your vehicle if you do the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the vehicle's drive system. G
WARNING
If the head restraints are not installed or not
adjusted correctly, they cannot provide pro- 80
SeatsSeats, steering wheel and mirrors

0043
Raises the backrest contour
0044 Softens the backrest contour
0087 Lowers the backrest contour
0085 Hardens the backrest contour Switching the seat heating on/off
Switching on/off G
WARNING
Repeatedly switching on the seat heating can
cause the seat cushion and backrest pads to
become very hot. The health of persons with
limited temperature sensitivity or a limited
ability to react to excessively high tempera-
tures may be affected or they may even suffer burn-like injuries. There is a risk of injury.
Therefore, do not switch the seat heating on
repeatedly. The three red indicator lamps in the button indi-
cate the heating level you have selected.
The system automatically switches down from
level 3to level 2after approximately eight
minutes.
The system automatically switches down from
level 2to level 1after approximately ten
minutes.
The system automatically switches off approx-
imately 20 minutes after it is set to level 1.
X Turn the SmartKey to position 1or 2in the
ignition lock (Y page 109).
X To switch on: press button0043repeatedly
until the desired heating level is set.
X To switch off: press button0043repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
heating may switch off.
Problems with the seat heating Problem
Possible causes/consequences and
0050 0050Solutions The seat heating has
switched off prematurely
or cannot be switched
on. The on-board voltage is too low because too many electrical consum-
ers are switched on.
X Switch off electrical consumers that you do not need, such as the
rear window defroster or interior lighting.
Once the battery is sufficiently charged, the seat heating will switch
back on automatically. 82
SeatsSeats
, steering wheel and mirrors

Steering wheel
Important safety notes
G
WARNING
You could lose control of your vehicle if you do the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the vehicle's drive system. G
WARNING
Children could injure themselves if they
adjust the steering wheel. There is a risk of
injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never leave children unsupervised in the vehicle. Adjusting the steering wheel
G
WARNING
If the steering wheel is unlocked while the
vehicle is in motion, it could change position
unexpectedly. This could cause you to lose
control of the vehicle. There is a risk of an
accident.
Before starting off, make sure the steering
wheel is locked. Never unlock the steering
wheel while the vehicle is in motion. 0043
Release lever
0044 Adjusts the steering wheel height
0087 Adjusts the steering wheel position (fore-
and-aft adjustment)
X Push release lever 0043down completely.
The steering column is unlocked.
X Adjust the steering wheel to the desired posi-
tion.
X Push release lever 0043up completely.
The steering column is locked.
X Check if the steering column is locked. When
doing so, try to push the steering wheel up or down or try to move it in the fore-and-aft
direction. Mirrors
Rear-view mirror
X
Anti-glare mode: flick anti-glare lever 0043for-
wards or back. Mirrors
83Seats, steering wheel and mirrors Z