Page 25 of 305

Keys, doors and windows23
1.Insert flat screwdriver into the slot
and separate the back cover from the remote control by slightly
turning the screwdriver.
2. Remove and replace battery. Use
CR 2032 or equivalent battery.
Pay attention to the installation
position.
3. Insert the back cover in the area of the key blade, fold down and
close.
Fault
If the central locking system cannot
be operated with the radio remote
control, the cause may be one of the
following:
● Fault in radio remote control.
● The range is exceeded.
● The battery voltage is too low.
● Frequent, repeated operation of the radio remote control while notin range, which will require re-
synchronisation.
● 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.
Manual unlocking 3 25.Electronic key system
Enables a keyless operation of the
following functions:
● central locking system 3 25
● power tailgate 3 32
● ignition switching on and starting the engine 3 155
The electronic key simply needs to be on the driver's person.
Additionally, the electronic key
includes the functionality of the radio
remote control 3 22.
Handle with care, protect from
moisture and high temperatures and
avoid unnecessary operation.
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24Keys, doors and windowsNote
Do not put the electronic key into the
load compartment or in front of the
Info Display.
Activation and Deactivation
keyless unlocking
If equipped, keyless unlocking of the
exterior door handles and the boot
can be activated or deactivated.
To deactivate the keyless unlocking,
press and hold b a at the same time
on the electronic key for approx. 3
seconds. The turn lights will indicate
the deactivation by flashing four
times. Using any exterior door handle
to unlock the doors or the boot will
indicated the deactivation by the turn
lights flashing fourt times quickly. If
keyless unlocking is deactivated,
deactive the alarm system before
starting the vehicle.
To activate the keyless unlocking,
press and hold b a at the same time
on the electronic key for approx. 3
seconds. The turn lights will indicates the activation by flashing quickly
twice.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 3 122.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
To replace:
1. Press button at the back of the electronic key unit and extract thekey blade from the housing.
Page 27 of 305

Keys, doors and windows252. Insert the key blade again forapprox. 6 mm and turn the key to
open the housing. Further
insertion of the key blade can
damage the housing.
3. Remove and replace battery. Use
CR 2032 or equivalent battery.
Pay attention to the installation
position.
4. Close the housing and insert key blade.
Electronic key synchronisation
The electronic key synchronises itself automatically during every startingprocedure.
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 25.
Memorised settings
Whenever the ignition is switched off,
some functions of the following
settings may be automatically
memorised by the remote control unit or the electronic key:
● automatic climate control
● lighting
● Infotainment system
● central locking system
● comfort settings
The saved settings are automatically
used the next time the ignition is
switched on with the memorised key
of the remote control unit 3 152 or
electronic key 3 23.A precondition is that Personalisation
by Driver is activated in the personal
settings of the Info Display. This must
be set for each remote control unit or
electronic key which is used. The
status change is available only after
locking and unlocking the vehicle.
The assigned memory position of the
power seat is automatically recalled
when switching on ignition and Auto
Memory Recall is activated in the
Info Display for the memorised
remote control or electronic key.
Power seat 3 52.
Vehicle personalisation 3 124.
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.
Note
In the event of an accident in which
airbags or belt pretensioners are
deployed, the vehicle is
automatically unlocked.
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26Keys, doors and windowsNote
A short time after unlocking with the
remote control the doors are locked
automatically if no door has been
opened. A precondition is that the
setting is activated in the vehicle
personalisation 3 124.
Remote control operation
Unlocking
Press c.
Unlocking mode can be set in the
vehicle personalisation menu in the
Info Display. Two settings are
selectable:
● All doors, load compartment and fuel filler flap will be unlocked by
pressing c once.
● Only the driver's door and fuel filler flap will be unlocked by
pressing c once. To unlock all
doors and load compartment,
press c twice.
Select the relevant setting in Settings
I Vehicle in the Info Display.
Info Display 3 121.
Vehicle personalisation 3 124.
The setting can be saved for the remote control being used.
Memorised settings 3 25.
Unlocking and opening the tailgate 3 32.
Locking
Close doors, load compartment and
fuel filler flap.
Press e.
If the driver's door is not closed properly, the central locking system
will not work.
Confirmation
Operation of the central locking
system is confirmed by the hazard warning flashers. A precondition is
that the setting is activated in the
vehicle personalisation 3 124.
Page 29 of 305
Keys, doors and windows27Electronic key system operation
The electronic key must be outside
the vehicle, within a range of approx. 1 m of the relevant door side.
Unlocking
Press the button on a front door
handle and pull the handle.
Unlocking mode can be set in the
vehicle personalisation menu in the
Info Display. Two settings are
selectable:
● All doors, load compartment and fuel filler flap will be unlocked by
pressing the button on any
exterior handle once.
● Only the driver's door and fuel filler flap will be unlocked by
pressing the button on the
driver's door exterior handle
once. To unlock all doors and
load compartment, press button
twice.
The setting can be changed in the
menu Settings in the Info Display.
Vehicle personalisation 3 124.
Locking
Press the button on a front door
handle.
All doors, load compartment and fuel
filler flap will be locked.
Page 30 of 305

28Keys, doors and windowsThe system locks if any of the
following occurs:
● It has been more than 5 seconds since unlocking.
● The button on an exterior handle has been pressed twice within
3 seconds to unlock the vehicle.
● Any door has been opened and all doors are now closed.
If the driver's door is not closed
properly, the electronic key remains in the vehicle or the ignition is not off,
locking will not be permitted.
If there have been two or more
electronic keys in the vehicle and the
ignition was on once, the doors will be locked even if just one electronic key
is taken out of the vehicle.
Unlocking and opening the tailgate
The tailgate can be unlocked and
opened hands-free via moving the
foot below the rear bumper or by
pushing the tailgate button under the
brand emblem when the electronic
key is in range. The doors remain
locked.
Load compartment 3 32.Operation with buttons on the
electronic key
The central locking system can also
be operated with the buttons on the
electronic key.
Press c to unlock.
Press e to lock.
Press X twice to unlock and open
only the power tailgate. To prevent
unintended opening of the tailgate,
X must be pressed longer than
during locking or unlocking.
Remote control operation 3 25.
Passive locking
Automatic locking 3 30.
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 3 124.
Central locking buttons Locks or unlocks all doors, the load
compartment and fuel filler flap from
the passenger compartment via a
switch in the driver's door panel.
Press e to lock.
Press c to unlock.
Page 31 of 305

Keys, doors and windows29Operation with the key in case of
a central locking system fault
In case of a fault, e.g. vehicle battery
or remote control / electronic key
battery is discharged, the driver's
door can be locked or unlocked with
the mechanical key.
The lock cylinder in the driver's door
is covered by a cap.
Remote control: to remove the cap,
insert the key into the recess at the
bottom of the cap and swivel the key
upward.
Keys 3 21.
Electronic key: to remove the cap,
press button at the back and extract
the key blade from the housing. Insert
the key into the recess at the bottom
of the cap and swivel the key upward.
Electronic key system 3 23.
Manual unlocking
Manually unlock the driver's door by
inserting and turning the key in the
lock cylinder.
The other doors can be opened by
pulling the interior handle twice or by
pressing c in the driver's door panel.
The load compartment and fuel filler
flap will possibly not be unlocked.
By switching on the ignition, the anti-
theft locking system is deactivated.
Page 32 of 305

30Keys, doors and windowsManual locking
Push inside locking knob of all doors
except driver's door or press e in the
driver's door panel. Then close the driver's door and lock it from the
outside by turning the key in the lock
cylinder. The fuel filler flap and
tailgate are possibly not locked.
After locking, cover the lock cylinder
with the cap: insert the cap with the
lower side in the recesses, swivel and
push the cap until it engages at the
upper side.
Automatic lockingAutomatic locking after driving off
This security feature can be
configured to automatically lock all
doors, load compartment and fuel
filler flap after driving off and
exceeding a certain speed.
When at a standstill after driving, the
vehicle will be unlocked automatically
as soon as the key is removed from
the ignition switch, or with electronic
key system when the ignition is
switched off.
Activation or deactivation of
automatic locking can be set in the
menu Settings I Vehicle in the Info
Display.
Info Display 3 121.
Vehicle personalisation 3 124.
The setting can be saved for the remote control or electronic key being used 3 25.
Automatic relock after unlocking This feature can be configured to
automatically lock all doors, load
compartment and fuel filler flap a
short time after unlocking with the
remote control or electronic key,
provided no door has been opened.
Activation or deactivation of
automatic relock can be set in the
menu Settings I Vehicle in the Info
Display.
Info Display 3 121.