2017 MERCEDES-BENZ B-Class lock

Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention
immediately.
The SmartKey batteries contain perchlorate
material, which may require special handling
and regard for the environment. National guide- lines must be observed during disposal. In Cal-
ifornia, see www.dtsc.ca.gov/
HazardousWaste/Perchlorate/index.cfm .
Mercedes-Benz recommends that you have the
battery replaced at a qualified specialist work-
shop.
Checking the battery X
Press the 0037or0036 button.
The battery is working properly if battery
check lamp 0043lights up briefly.
The battery is discharged if battery check
lamp 0043does not light up briefly.
X Change the battery (Y page 69).
i If the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the 0037or0036 button:
R locks or
R unlocks the vehicle
i You can get a battery at any qualified spe-
cialist workshop.
Replacing the battery You require a CR 2025 3 V cell battery. X
Take the mechanical key out of the SmartKey
(Y page 68). X
Press mechanical key 0044into the opening in
the SmartKey in the direction of the arrow
until battery tray cover 0043opens. When doing
so, do not hold cover 0043shut.
X Remove battery tray cover 0043. X
Repeatedly tap the SmartKey against your
palm until battery 0087falls out.
X Insert the new battery with the positive ter-
minal facing upwards. Use a lint-free cloth to
do so.
X Make sure that the surface of the battery is
free of lint, grease and other contaminants.
X Insert the front tabs of battery tray cover 0043
and then press to close it.
X Insert mechanical key into the SmartKey
(Y page 68).
X Check the function of all SmartKey buttons on
the vehicle. SmartKey
69Opening and closing Z

Problems with the SmartKey
Problem
Possible causes/consequences and
0050
0050Solutions You cannot lock or
unlock the vehicle using
the SmartKey. The SmartKey battery is discharged or nearly discharged.
X Vehicles without KEYLESS-GO: try again to lock or unlock the
vehicle using the remote control function of the SmartKey. Point the tip of the SmartKey at the driver's door handle from close range and
press the 0036or0037 button.
X Check the SmartKey battery (Y page 69) and replace it if necessary
(Y page 69).
If this does not work: X Unlock (Y page 73) or lock (Y page 73) the vehicle using the
mechanical key. There is interference from a powerful source of radio waves.
X Vehicles without KEYLESS-GO: try again to lock or unlock the
vehicle using the remote control function of the SmartKey. Point the
tip of the SmartKey at the driver's door handle from close range and press the 0036or0037 button.
If this does not work: X Unlock (Y page 73) or lock (Y page 73) the vehicle using the
mechanical key. The SmartKey is faulty.
X Unlock (Y page 73) or lock (Y page 73) the vehicle using the
mechanical key.
X Have the SmartKey checked at a qualified specialist workshop. You can no longer lock or
unlock the vehicle using
KEYLESS-GO. The SmartKey battery is discharged or nearly discharged.
X Check the SmartKey battery (Y page 69) and replace it if necessary
(Y page 69).
If this does not work: X Unlock (Y page 73) or lock (Y page 73) the vehicle using the
mechanical key. There is interference from a powerful source of radio waves.
X Unlock (Y page 73) or lock (Y page 73) the vehicle using the
mechanical key. 70
SmartKeyOpening and closing

Problem
Possible causes/consequences and
0050
0050Solutions KEYLESS-GO is malfunctioning.
X Lock/unlock the vehicle using the remote control function of the
SmartKey.
X Have the vehicle and SmartKey checked at a qualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
X Unlock (Y page 73) or lock (Y page 73) the vehicle using the
mechanical key.
X Have the vehicle and SmartKey checked at a qualified specialist
workshop. The drive system cannot
be started using the
SmartKey. 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 drive system again.
If this does not work:
X Check the 12 V battery and charge it if necessary (Y page 248).
or
X Check the high-voltage battery and charge it if necessary
(Y page 118).
or
X Jump-start the vehicle (Y page 249).
or
X Consult a qualified specialist workshop. The drive system cannot
be started using the
Start/Stop button. The
SmartKey is in the vehi-
cle. The vehicle is locked.
X Unlock the vehicle and try to start the vehicle again. The SmartKey battery is discharged or nearly discharged.
X Check the SmartKey battery (Y page 69) and replace it if necessary
(Y page 69).
If this does not work: X Start your vehicle with the SmartKey in the ignition lock. There is interference from a powerful source of radio waves.
X Start your vehicle with the SmartKey in the ignition lock. You have lost a Smart-
Key. X
Have the SmartKey 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
mechanical key. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. SmartKey
71Opening and closing Z

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

from the inside will trigger the anti-theft alarm
system. Switch off the alarm (Y page 65).
If a locked door is opened from the inside, the
previous unlock status of the vehicle will be
taken into consideration if:
R the vehicle was locked using the locking but-
ton for the central locking, or
R if the vehicle was locked automatically
The vehicle will be fully unlocked if it had previ-
ously been fully unlocked. If only the driver's
door had been previously unlocked, only the
door which has been opened from the inside is
unlocked. Automatic locking feature
X
To deactivate: press and hold button 0043for
approximately five seconds until a tone
sounds.
X To activate: press and hold button 0044for
approximately five seconds until a tone
sounds.
If you press one of the two buttons and do not
hear a tone, the relevant setting has already
been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are turn-
ing.
You could therefore lock yourself out if:
R the vehicle is being pushed.
R the vehicle is being towed.
R the vehicle is on a roller dynamometer.
You can also switch the automatic locking func-
tion on and off using the on-board computer
(Y page 166). Unlocking the driver's door (mechan-
ical key)
If the vehicle can no longer be locked or
unlocked with the SmartKey or KEYLESS-GO,
use the mechanical key.
If you use the mechanical key to unlock and
open the driver's door, the anti-theft alarm sys- tem will be triggered (Y page 65).
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 counter-clockwise
as far as it will go to position 0047.
The door is unlocked.
X Turn the mechanical key back and remove it.
X Insert mechanical key into the SmartKey
(Y page 68). Locking the vehicle (mechanical key)
If the vehicle can no longer be locked with the
SmartKey or KEYLESS-GO, use the mechanical
key.
X Open the driver's door.
X Close the front-passenger door, the rear
doors and the tailgate.
X Press the locking button on the driver’s door
(Y page 72).
X Check whether the locking knobs on the
front-passenger door and the rear doors are
still visible. Press down the locking knobs by
hand, if necessary.
X Close the driver's door. Doors
73Opening and closing Z

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