Page 23 of 313
Keys, doors and windows21Replacing batteryReplace 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 3 121.
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.
2. Insert the key blade again for approx. 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.
Radio remote control
Page 24 of 313

22Keys, doors and windowsEnables operation of the following
functions via the use of the remote
control buttons:
● central locking system 3 25
● anti-theft locking system 3 34
● anti-theft alarm system 3 34
● power windows 3 40
● sunroof 3 43
The remote control has a range of up to 100 m, but may also be much less
due to external influences. The
hazard warning flashers confirm
operation.
Handle with care, protect from
moisture and high temperatures and
avoid unnecessary operation.
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 not
in 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 systemEnables a keyless operation of the
following functions:
● central locking system 3 25
● switching on ignition and starting the engine 3 154
The electronic key simply needs to be on the driver's person.
Additionally, the electronic key
includes the functionality of the radio
remote control:
● central locking system
● anti-theft alarm system
● power windows
The hazard warning flashers confirm
operation.
Handle the device with care, protect
from moisture and high temperatures
and avoid unnecessary operation.
Notice
Do not put the electronic key in the
load compartment.
Page 27 of 313

Keys, doors and windows25If the driver's door is not closed
properly, the central locking system will not work.
Passive locking
Automatic locking 3 28.
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 3 122.
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 of the following settings are
automatically memorised by the
currently used remote control unit or
the electronic key:
● automatic climate control
● lighting
● Infotainment system
● central locking system
● FlexRide interactive driving system
● comfort settingsThe saved settings are automatically
used the next time the ignition is
switched on with the memorised
electronic key 3 22.
A precondition is that Personalisation
by Driver is activated in the personal
settings of the Info Display. This must
be set for each 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 electronic
key.
Power seat 3 50.
Vehicle personalisation 3 122.
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.
Page 28 of 313
26Keys, doors and windowsNotice
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 or electronic key, the doors are being locked automatically
if no door has been opened. A
precondition is that the setting is
activated in the vehicle
personalisation 3 122.
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.
Operation with the key in case of a central locking system fault
In case of a fault, e.g. vehicle battery
or electronic key battery is
discharged, the driver's door can be locked or unlocked with the key blade.Push the button on the electronic key
and pull out the key blade.
The lock cylinder in the driver's door
is covered by a cap.
Page 36 of 313

34Keys, doors and windowsNotice
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 tailgatemay not even be 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 event, lift the tailgate manually
to its normal end position.Vehicle security
Anti-theft locking system9 Warning
Do not use the system if there are
people in the vehicle! The doorscannot be unlocked from the
inside.
The system deadlocks all the doors. All doors must be closed otherwise
the system cannot be activated.
Unlocking the vehicle disables the
mechanical anti-theft locking system.
This is not possible with the central
locking button inside the vehicle.
Activating
Press e on the remote control or
electronic key twice within 5 seconds .
Anti-theft alarm system The anti-theft alarm system is
combined with the central locking
system.
It monitors: ● doors, tailgate, bonnet
● passenger compartment including adjoining load
compartment
Page 39 of 313

Keys, doors and windows37If the vehicle's battery is to be
disconnected (e.g. for maintenance
work), the alarm siren must be
deactivated as follows: switch the
ignition on then off, then disconnect
the vehicle's battery within
15 seconds.
Immobiliser
The immobiliser is activated
automatically.
If the control indicator d flashes when
the ignition is on, there is a fault in the
system; the engine cannot be started. Switch off the ignition and repeat the
start attempt. Retry with the key in the transmitter pocket. Operation on
vehicles with electronic key system in case of failure 3 152.
If the control indicator d continues
flashing, attempt to start the engine
using the spare key.
Seek the assistance of a workshop.Notice
Radio Frequency Identification
(RFID) tags may cause interference with the key. Do not have it placednear the key when starting the
vehicle.
Notice
The immobiliser does not lock the doors. You should always lock the
vehicle after leaving it and switch on the anti-theft alarm system 3 25,
3 34.
Control indicator d 3 109.Exterior mirrors
Convex shape The shape of the mirror makes
objects appear smaller, which will
affect the ability to estimate
distances.
Side blind spot alert 3 205.
Electric adjustment
Select the relevant exterior mirror by
pushing í for left mirror or ì for right
mirror. LED in button indicates the
selection.
Page 44 of 313

42Keys, doors and windows
Press and hold c for more than
2 seconds to open windows.
Press and hold e for more than
2 seconds to close windows.
Release button to stop window
movement.
If the windows are fully opened or
closed, the hazard warning lights will
flash twice.
Overload
If the windows are repeatedly
operated within short intervals, the window operation is disabled for
some time.
Initialising the power windows
If the windows cannot be closed
automatically (e.g. after
disconnecting the vehicle battery), a
warning message is displayed in the
Driver Information Centre.
Vehicle messages 3 121.
Activate the window electronics as
follows:
1. Close doors.
2. Switch on ignition.
3. Pull the switch until the window is closed and keep pulling for
additional 2 seconds.
4. Push the switch until the window is completely open and keep
pushing for additional 2 seconds.
5. Repeat for each window.Heated rear window
Heating of rear window and exterior
mirrors is operated by pressing b.
LED in button illuminates.
Heating works with the engine
running and is switched off
automatically after a short time.
Page 140 of 313

138LightingPath lighting
Headlights, tail lights and number
plate lights illuminate the surrounding area for an adjustable time after
leaving the vehicle.
ActivatingHalogen headlights
1. Switch off the ignition.
2. Depending on version, remove the ignition key.
3. Open the driver's door.
4. Pull the indicator lever.
5. Close the driver's door.
If the driver's door is not closed, the
lights switch off after two minutes.
Exit lighting is switched off
immediately if the indicator lever is
pulled while the driver's door is open.LED headlights
Path lighting is activated, when the
ignition is switched off and the driver's door is opened.
This function can be activated or
deactivated in the vehicle
personalisation.
Select the relevant setting in Settings
I Vehicle in the Info Display.
Info Display 3 116.
Vehicle personalisation 3 122.
The settings can be saved for the key being used 3 25.
Battery discharge protection Switching off electric lights
To prevent discharge of the vehicle
battery when the ignition is switched off, some interior lights are switched
off automatically after some time.