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24Keys, doors and windowsOperation with buttons on the
electronic key
The central locking system can also
be operated with the buttons on the
electronic key.
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 3 127.
The setting can be saved for the key
being used. Memorised settings
3 25.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.Passive locking
Automatic locking 3 27.
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 3 127.
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.
Page 27 of 329

Keys, doors and windows25Manual unlocking 3 25.
Memorised settings
Whenever the ignition is switched off, the following settings are
automatically memorised by the
electronic key:
● automatic climate control
● lighting
● Infotainment system
● central locking system
● Sport mode settings
● comfort settings
The 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 AutoMemory Recall is activated in the
Info-Display for the memorised
electronic key.
Power seat 3 50.
Vehicle personalisation 3 127.
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.
Note
A short time after unlocking with the
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 3 127.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. LED in button
illuminates.
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.
Page 128 of 329

126Instruments and controlsWarning chimesWhen starting the engine or whilstdriving
Only one warning chime will sound at a time.
The warning chime regarding not
fastened seat belts has priority over
any other warning chime.
● If seat belt is not fastened.
● If a door or the tailgate is not fully
closed when starting off.
● If a certain speed is exceeded with parking brake applied.
● If adaptive cruise control deactivates automatically.
● If approaching a vehicle ahead too closely.
● If approaching a pedestrian ahead too closely.
● If a programmed speed or speed
limit is exceeded.
● If a warning message appears in the Driver Information Centre.
● If the electronic key is not in the passenger compartment.● If the parking assist detects an object.
● If an unintended lane change occurs.
● If the diesel particle filter has reached the maximum filling
level.
When the vehicle is parked and/or the driver's door is opened
● With exterior lights on.
● If the trailer hitch is not engaged.
During an Autostop ● If the driver's door is opened.
● If any condition for an Autostop is
not fulfilled.
Battery voltage When the vehicle battery voltage is
running low, a warning message will
appear in the Driver Information
Centre.1. Switch off any electrical
consumers which are not requiredfor a safe ride, e.g. seat heating,
heated rear window or other main consumers.
2. Charge the vehicle battery by driving continuously for a while or
by using a charging device.
The warning message will disappear
after the engine has been started
twice without a voltage drop.
If the vehicle battery cannot be
recharged, have the cause of the fault
remedied by a workshop.
Page 319 of 329

Customer information317Verband der Automobilindustrie e.V.
AdBlue ®
is a registered trademark of
the VDA.Vehicle data recording
and privacy
Event data recorders
Electronic control units are installed in
your vehicle. Control units process
data which is received by vehicle
sensors, for example, or which they
generate themselves or exchange
amongst themselves. Some control
units are necessary for the safe
functioning of your vehicle, others
assist you while you drive (driver
assistance systems), while others
provide comfort or infotainment
functions.
Operating data in the vehicle Control units process data for
operation of the vehicle.This data includes, for example:
● Vehicle status information (e.g. wheel rotation rate, speed,
movement delay, lateral
acceleration, "seatbelts
fastened" display),
● Ambient conditions (e.g. temperature, rain sensor,
distance sensor).
Most of this data is volatile and is
processed only in the vehicle itself,
and not beyond the operating time.
Moreover, many control units include
data storage device (amongst others the vehicle key). This is used to allow
information to be documented
temporarily or permanently on vehicle condition, component stress,
maintenance requirements and
technical events and errors.
The following information, for
example, is stored:
● System component operating states (e.g. fill level, tyre
pressure, battery status),
● State of charge of the high voltage battery, estimated range
(in the case of electric vehicles),