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Keys, doors and windows21Unlocking 3 22.
Basic settings Some settings can be changed in the
menu Settings in the Info-Display.
Vehicle personalisation 3 111.
Radio remote control battery
replacement
Replace the battery as soon as the
range is reduced.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Key with foldaway key section
Extend the key and open the unit.
Replace the battery (battery type CR 2032), paying attention to the
installation position. Close the unit
and synchronise.
Key with fixed key section
Have the battery replaced by a
workshop.
Radio remote control
synchronisation
After replacing the battery, unlock the
door with the key in the driver's door
lock. The radio remote control will be
synchronised when the ignition is
switched on.
Memorised settings Whenever the key is removed from
the ignition switch, the following
settings are automatically memorised by the key:
● lighting
● Infotainment system (only CD 400)
● central locking system
● comfort settings
The saved settings are automatically
used the next time the memorised key
is inserted into the ignition switch and
turned to position 1 3 139.
A precondition is that Personalization
by driver is activated in the personal
settings of the Graphic-Info-Display.
This must be set for each key used.
On vehicles equipped with
Page 24 of 251

22Keys, doors and windowsColour-Info-Display, the
personalisation is permanently
activated.
Vehicle personalisation 3 111.
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.Unlocking
Press c.
Two settings are selectable: ● All doors, load compartment and fuel filler flap are unlocked by
pressing c once.
● Only the driver's door, load compartment and fuel filler flap
are unlocked by pressing c once.
To unlock all doors, press c
twice.
The setting can be changed in the
menu Settings in the Info-Display.
Vehicle personalisation 3 111.
The setting can be saved for the key
being used.
Memorised settings 3 21.
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.
Page 25 of 251
Keys, doors and windows23Unlocking and opening the
tailgate
Press c when the ignition is off to
unlock all doors. The tailgate is
released and is unlocked and opened
by pushing the touchpad switch under
the tailgate moulding.
Central locking button
Locks or unlocks all doors, the load
compartment and fuel filler flap from
the passenger compartment.
Press central locking button: the
doors are locked or unlocked. If the
doors are locked, the LED in the
button illuminates.
After locking with the radio remote
control, the LED in the button
illuminates for approx. 2 minutes.
Fault in radio remote control
system
Unlocking
Manually unlock the driver's door by
turning the key in the lock. Switch on
the ignition and press the central
locking button to unlock all doors,
load compartment and fuel filler flap.
By switching on the ignition, the anti-
theft locking system is deactivated 3 27.
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24Keys, doors and windowsLocking
Close the driver's door, open the
passenger door, then press central
locking button. The vehicle is locked.
Close the passenger door.
Fault in central locking system
Unlocking
Manually unlock the driver's door by
turning the key in the lock. The other
doors can be opened by pulling the
interior handle twice. The load
compartment and fuel filler flap
cannot be opened.
To deactivate the anti-theft locking
system, switch on the ignition 3 27.Locking
Insert key into the opening above the
lock on inside of the door and operate the lock by pressing until it clicks.
Then close the door. The procedure
must be carried out for each door. The driver's door can also be locked from
the outside with the key. The fuel filler
flap and the tailgate cannot be locked.
Automatic lockingAutomatic locking after driving off
The vehicle is locked automatically when exceeding a speed of 2 mph.
Opening from outside is not possible.
Additionally, opening of the rear
doors from inside is not possible
when the vehicle speed is above
2 mph.
Green LEDs indicate that opening
from inside is possible:
Hold the inner rear door handle to
activate the proximity sensor and
then pull the handle.
When the vehicle speed is below
2 mph, opening of the doors from
outside is possible after:
● opening any door from inside
● pressing the central locking button
Page 27 of 251

Keys, doors and windows25Caution
Automatic locking is only active
with ignition on.
Fault in the automatic locking system
In case of a system fault, control
indicator ^ illuminates in the
instrument cluster and a warning
chime sounds to indicate that the rear
doors are not secured against
opening. Inform passengers to keep
clear of the door handles.
Stop immediately and activate the
child lock in both rear doors. If the
child lock is already activated, first
deactivate and then activate again.
The green LEDs will extinguish and
the warning chime will stop as soon
as both child locks are activated. Pull the inner rear door handles to check
if the doors are locked from inside.
Consult a workshop.
Automatic relock after unlocking
A short time after unlocking with the
remote control, all doors, load
compartment and fuel filler flap are
locked automatically, provided that no
door has been opened.
Child locks9 Warning
Use the child locks whenever
children are occupying the rear
seats.
Using a key or suitable screwdriver,
turn the child lock in the rear door to
the horizontal position. The green
LED will extinguish. The door cannot
be opened from the inside. For
deactivation, turn the child lock to the
vertical position.
Page 28 of 251
26Keys, doors and windowsDoors
Rear doors9 Warning
Take care of other persons when
getting in or out at the front and
rear simultaneously.
Only use the grab handle
provided.
The rear doors have an automatic
locking feature 3 24.
Load compartment
Tailgate Opening
After unlocking, push the touchpad
switch under the tailgate moulding
and open the tailgate.
Central locking system 3 22.
Closing
Use one of the interior handles.
Do not push the touchpad switch under the moulding whilst closing as
this will unlock the tailgate again.
Central locking system 3 22.
General hints for operating
tailgate
9 Danger
Do not drive with the tailgate open
or ajar, e.g. when transporting
bulky objects, since toxic exhaust
Page 29 of 251

Keys, doors and windows27gases, 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, such as 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.
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.
If the ignition was on, the driver's door
must be opened and closed once so
that the vehicle can be secured.
Unlocking the vehicle disables the
mechanical anti-theft locking system.
This is not possible with the central
locking button.
Activating
Press e on the radio remote control
twice within 10 seconds.
Anti-theft alarm system The anti-theft alarm system is
operated in conjunction with the
central locking system.
It monitors: ● doors, tailgate, bonnet
● ignition
Unlocking the vehicle deactivates the anti-theft alarm system.
Page 30 of 251

28Keys, doors and windowsStatus LED
Status LED is integrated in the central
locking button.
Status during the first 10 seconds of
anti-theft alarm system activation:
LED illuminates:test, arming delayLED flashes
quickly:doors, tailgate or
bonnet not
completely closed,
or system fault
Status after system is armed:
LED flashes
slowly:system is armed
Seek the assistance of a workshop in the event of faults.
Alarm
When triggered, the alarm horn
sounds and the hazard warning lights
flash simultaneously. The number
and duration of alarm signals are
stipulated by legislation.
The alarm can be silenced by
pressing any button of the radio
remote control or by switching on the
ignition.
The anti-theft alarm system can be
deactivated only by pressing c or by
switching on the ignition.
A triggered alarm, which has not been interrupted by the driver, will be
indicated by a warning message or a
warning code in the Driver
Information Centre after switching on
the ignition.
Vehicle messages 3 105.
If 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 system is part of the ignition
switch and checks whether the
vehicle is allowed to be started with
the key being used.
The immobiliser is activated
automatically after the key has been removed from the ignition switch.
If 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 then repeat the start attempt.
If control indicator d continues
flashing, attempt to start the engine
using the spare key and seek the
assistance of a workshop.
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 22,
3 27.
Control indicator d 3 98.