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Keys, doors and windows23Notice
To save battery power, the keyless
functions are set to stand-by after 21
days of non-use. To reactivate the
functions, press a button on the
electronic key.
Replacing battery in electronic
key
Replace the battery as soon as the
system no longer operates properly
or the range is reduced. The need for battery replacement is indicated by a
message in the Driver Information
Centre 3 106.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
1. Remove the cover.
2. Extract the flat battery from its location.
3. Replace battery with a battery of the same type. Pay attention to
the installation position.
4. Clip the cover in place.
Fault
If the central locking cannot be
operated or the engine cannot be
started, the cause may be one of the
following:
● Fault in electronic key.
● Electronic key is out of reception range.
● The battery voltage is too low.
● Overload of the central locking system by operating at frequent
intervals, the power supply is
interrupted for a short time.
● Interference from higher-power radio waves from other sources.
To rectify the cause of the fault,
change the position of the electronic
key.
Manual unlocking 3 23.
Central locking system Unlocks and locks doors, load
compartment and fuel filler flap.
A pull on an interior door handle
unlocks the respective door. Pulling
the handle once more opens the door.
Notice
In the event of an accident in which
airbags or belt pretensioners are
deployed, the vehicle is
automatically unlocked.
Notice
A short time after unlocking with the
remote control the doors are locked
automatically if no door has been
Page 27 of 283
Keys, doors and windows25Electronic key system operation
The electronic key must be outside
the vehicle, within a range of approx. 1 m of the relevant door side.
Unlocking
Pass a hand behind the door handle
of a front door to unlock the vehicle or
press the tailgate button.
Unlocking mode can be set in the
vehicle personalisation menu in the
Info Display. Two settings are
selectable:
● Only the driver's door and fuel filler flap will be unlocked by
passing a hand behind the
driver's door handle.
● All doors, load compartment and fuel filler flap will be unlocked by
passing a hand behind the
passenger's door handle or by
pressing the tailgate button.
● Only the tailgate will be unlocked
by pressing the tailgate button.
Vehicle personalisation 3 107.
Locking
Press marking of the front door
handles.
Entire vehicle will be locked.
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26Keys, doors and windowsIf the vehicle is not closed properly,
the electronic key remains in the
vehicle or the ignition is not off,
locking will not be permitted and a
warning chime sounds.
Keep the hand behind the door
handle or keep the tailgate button
pressed to close the windows.
Unlocking and opening the tailgate
The tailgate can be unlocked and
opened hands-free by pushing the
touchpad under the tailgate moulding when the electronic key is in range.
The doors remain locked.
Load compartment 3 29.Operation with buttons on the
electronic key
The central locking system can also
be operated with the buttons on the
electronic key.
Press O to unlock.
Press N to lock.
Press P longer to unlock and open
only the power tailgate.
Remote control operation 3 23.
Confirmation
Operation of central locking system is
confirmed by the hazard warning
flashers. A precondition is that the
setting is activated in the vehicle
personalisation 3 107.
Central locking button
Locks or unlocks all doors, the load
compartment and fuel filler flap from
inside the passenger compartment.
Press Q
to lock. The LED in the button
illuminates.
Press Q again to unlock. The LED in
the button extinguishes.
Page 31 of 283
Keys, doors and windows29Electric child locks
Remotely operated system to prevent
opening of the rear doors via the
interior door handles and the use of
the rear power windows.
Switching on
Press R. The indicator light in the
button comes on, accompanied by a confirmation message. This indicator
light remains on until the child lock is
switched off.
Switching off
Press R again. The indicator light on
button goes off, accompanied by a
confirmation message.
Doors
Load compartment Tailgate
Opening
After unlocking, press the tailgate
button and open the tailgate.
Closing
Use the interior handle.
Do not push the touchpad whilst
closing as this will unlock the tailgate
again.
Central locking system 3 23.
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30Keys, doors and windowsPower tailgate9Warning
Take care when operating the
power tailgate. Risk of injury,
particularly to children.
Keep a close watch on the
movable tailgate when operating.
Ensure that nothing becomes
trapped during operating and no
one is standing within the moving
area.
The power tailgate can be operated
by:
● Pressing P longer on the
electronic key.
● Hands-free operation with motion
sensor below the rear bumper.
● The tailgate button and T in the
open tailgate.
On vehicles with automatic
transmission, the tailgate can only be operated when the vehicle is
stationary and automatic
transmission in P.
The turn lights flash and a chime
sounds when the power tailgate is
operating.
Notice
Operating the power tailgate does
not operate the central locking
system. To open the tailgate with the
button on the electronic key, or with
the tailgate button or via hands-free
operation, it is not necessary to
unlock the vehicle. A precondition is
that the electronic key is outside the
vehicle, within a range of approx.
1 m of the tailgate.
Do not leave the electronic key in the load compartment.
Lock the vehicle after closing if it was
unlocked previously.
Central locking system 3 23.Operation with the electronic key
Press P longer to open or close the
tailgate.
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Keys, doors and windows31Hands-free operation
To open or close the tailgate move the
foot below the rear bumper back and
forth in the area below the number plate. Do not hold the foot longer or
move too slow below the bumper. The electronic key must be outside the
vehicle, within a range of approx.
1 m of the tailgate.
Activation or deactivation of hands-
free operation can be set in the menu
Settings I Vehicle in the Info Display.
Info Display 3 102.
Vehicle personalisation 3 107.
9 Danger
Do not touch any vehicle parts
below the vehicle during hands-
free operation. There is a risk of
injury from hot engine parts.
Automatic locking after hands-free
operation
Press button S in the open tailgate,
the whole vehicle will be locked after hands-free closing of the tailgate.
Operation with the tailgate button
To open the tailgate, press the
tailgate button until the tailgate starts
to move. If the vehicle is locked, the
electronic key must be outside the
vehicle, within a range of approx.
1 m of the tailgate.
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32Keys, doors and windows
To close, press T in the open
tailgate until the tailgate starts to
move.
Stop or change direction of
movement
Stop movement of the tailgate immediately:
● press P longer on the
electronic key, or
● press the tailgate button, or
● press T on the open tailgate
Pressing one of the switches again
will reverse the direction of
movement.
Adjust reduced opening height
1. Open power tailgate with any operation switch.
2. Stop movement at the desired height by pressing T. If
required, manually move the
stopped tailgate to the desired
position.
3. Press and hold the button T on
the inside of the open tailgate for
3 seconds.
Notice
Adjusting opening height should be programmed at ground level.
A chime sound indicates the new
setting and the turn lights will flash.
The reduced height can only set at an
opening angle of above 30°.
To delete reduced height position,
open tailgate in half position and
press T for 3 seconds.
The tailgate can only be held open if a minimum height is exceeded
(minimum opening angle from 30°).
The opening height cannot be
programmed below that height.
Safety function
If the power tailgate encounters an
obstacle during opening or closing,
the direction of movement will
automatically be reversed slightly.
Multiple obstacles in one power cycle will deactivate the function. In this
case, close or open the tailgate
manually.
The power tailgate has pinch sensors
on the side edges. If the sensors
detect obstacles between tailgate and chassis, the tailgate will open, until it
is activated again or closed manually.
The safety function is indicated by a
warning chime.
Page 35 of 283

Keys, doors and windows33Remove all obstacles before
resuming normal power operation.
If the vehicle is equipped with factory-
fitted towing equipment and a trailer
is electrically connected, the power
tailgate can only be opened with the
tailgate button or closed with T in
the open tailgate. Ensure that there
are no obstacles in the moving area.
Overload
If the power tailgate is repeatedly
operated at short intervals, the
function is disabled for some time.
Move tailgate manually into end
position to reset the system.
Initialising power tailgate If the power tailgate cannot be
operated automatically (e.g. after
disconnecting the vehicle battery), a
warning message is displayed in the
Driver Information Centre.
Activate electronics as follows: 1. Open tailgate manually.
2. Close tailgate manually.
3. Switch on ignition.Seek the assistance of a workshop if
the problem is not solved.
General hints for operating
tailgate9 Danger
Do not drive with the tailgate open
or ajar, e.g. when transporting
bulky objects, since toxic exhaust
gases, which cannot be seen or
smelled, could enter the vehicle.
This can cause unconsciousness
and even death.
Caution
Before opening the tailgate, check overhead obstructions, e.g. a
garage door, to avoid damage to
the tailgate. Always check the
moving area above and behind the
tailgate.
Notice
The installation of certain heavy
accessories onto the tailgate may
affect its ability to remain open.
Notice
The operation of the power tailgate
is disabled under low vehicle battery
conditions. In this case, the tailgate
may not even by manually operable.
Notice
With the power tailgate disabled and all doors unlocked, the tailgate can
only be operated manually. In this
event, manually closing the tailgate
requires significantly greater force.
Notice
At low outside temperatures the
tailgate may not open fully by itself.
In this case lift the tailgate manually
to its normal end position.