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Keys, doors and windows21
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 you switch on the
ignition.
Memorised settings Whenever the vehicle is locked, the
following settings are automatically
memorised by the key being used:
■ Electronic climate control,
■ Info-Display,
■ Infotainment system,
■ Instrument panel illumination.The saved settings are automatically
used the next time that key is used to
unlock the vehicle.
Central locking system Unlocks and locks doors, load
compartment and fuel filler flap.
A pull on an interior door handle
unlocks the entire vehicle and opens
the door.
Notice
In the event of an accident of a
certain severity, the vehicle unlocks
automatically.
Notice
A short time after unlocking with the
remote control the doors are locked
automatically if no door has been
opened.Unlocking
Central locking system with key
activation
Turn the key in the driver's door lock
to the front.
Page 24 of 231
22Keys, doors and windows
Central locking system with radio
remote control
Press button q.
Two settings are possible: ■ To unlock only the driver's door: Press button q once. To unlock the
entire vehicle: Press button q
twice.
■ To unlock the entire vehicle: Press button q once.
Settings can be changed in the Driver Information Centre.
Vehicle personalisation 3 95.
Locking
Close doors, load compartment and
fuel filler flap. If the driver's door is not
closed properly, the central locking
system will not work.
Central locking system with key
activation
Turn the key in the driver's door lock
rearwards.
Central locking system with radio remote control
Press button p.
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Keys, doors and windows23
Central locking button
Press button m: the doors are locked
or unlocked.
The LED in the button m illuminates
for approx. 2 minutes after locking
with the radio remote control.
If the doors are locked from the inside
whilst driving, the LED remains
illuminated.
Fault in radio remote control
Unlocking
Turn the key in the driver's door lock
as far as it will go. The entire vehicle
is unlocked when the driver's door is
opened. To unlock the other doors,
switch on the ignition and press the
central locking button.
Locking
Close the driver's door, open the
passenger door, then press central
locking button m. The vehicle is
locked. Close the passenger door.
Fault in central locking system
Unlocking
Turn the key in the driver's door lock
as far as it will go. The other doors can be opened by pulling the interior
handle (not possible if the anti-theft
locking system is active). The load
compartment and fuel filler flap
remain locked. To deactivate the anti- theft locking system, switch on the
ignition 3 25.
Locking
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24Keys, doors and windows
Insert the key into the opening abovethe lock on the inside of the door and
operate the lock by lifting 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 tailgate cannot be locked.
Automatic locking This security feature can be
configured to automatically lock all
doors, load compartment and fuel
filler flap as soon as the vehicle is
driven. Vehicle personalisation
3 95.Child locks9 Warning
Use the child locks whenever
children are occupying the rear
seats.
Using a key or suitable screwdriver,
turn button on rear door lock to the
horizontal position. The door cannot
be opened from inside.
Doors
Load compartment
Opening
After unlocking, push the button
below the handle and open the
tailgate.
9 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
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Keys, doors and windows25smelled, could enter the vehicle.
This can cause unconsciousness
and even death.
Notice
The installation of certain heavy accessories onto the tailgate may
affect its ability to remain open.
Closing
Use the interior handle.
Do not press the button under the
moulding while closing as this will unlock the tailgate again.
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 or 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 with the remote
control
Press button p again within
10 seconds of locking.
Anti-theft alarm system
The anti-theft alarm system is
operated in conjunction with the
central locking system.
It monitors: ■ Doors, load compartment, bonnet,
■ Ignition.
Unlocking the vehicle deactivates the
anti-theft alarm system.
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26Keys, doors and windows
Light-emitting diode (LED)
During the first 10 seconds of anti-
theft alarm system activation:
LED illu‐
minates=Test, ignition delay,LED
flashes
quickly=Door, load
compartment or bonnet open, or system fault.
After the first 10 seconds of anti-theft
alarm system activation:
LED flashes
slowly=System active.
Seek the assistance of a workshop in
the event of faults.
Alarm
When triggered, the alarm gives off
an acoustic signal (horn) and a visual signal (hazard warning flashers). The
number and duration of which are
stipulated by legislation.
The alarm siren can be silenced by
pressing any button of the radio
remote control or by switching on the
ignition. The anti-theft alarm system is deactivated at the same time.
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 checks whether the
vehicle is allowed to start with the key being used. If the transponder in the
key is recognised, the engine can be
started.The immobiliser activates itself
automatically after the key has been removed from the ignition switch.
If control indicator A 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 A continues
flashing, attempt to start the engine
using the spare key and seek the
assistance of a workshop.
If control indicator A illuminates after
the engine has started, there is a fault in the engine electronics or
transmission electronics 3 81,
3 122, 3 127, or there is water in the
diesel fuel filter 3 90.
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 21,
3 25.
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30Keys, doors and windows
Windscreen stickers
Do not attach stickers such as toll
road stickers or similar on the
windscreen in the area of the interior
mirror. Otherwise the detection zone
of the sensor and the view area of the camera in the mirror housing could be
restricted.
Manual windows
The door windows can be opened or
closed with the window winders.
Power windows9 Warning
Take care when operating the
power windows. Risk of injury,
particularly to children.
Keep a close watch on the
windows when closing them.
Ensure that nothing becomes
trapped in them as they move.
Power windows can be operated:
■ with the ignition on,
■ within 5 minutes of switching the ignition off,
■ within 5 minutes of turning the ignition key to position 1.
After switching off the ignition, the
window operation is disabled when
the driver's door is opened, then
closed and locked.Operate the control to open or close
the window.
For vehicles with automatic feature,
pull or press the switch again to stop
window movement.
Safety function
If the window glass encounters
resistance during automatic closing, it is immediately stopped and openedagain.
In the event of closing difficulties due
to frost or the like, operate the switch
several times to close the window in
stages.
Page 40 of 231

38Seats, restraintsHeating
Activate heating by pressing ß button
for the seat with the ignition on.
LED in button ß on: relevant front
seat heating on.
Seat heating is operational when the engine is running and during an
Autostop.
Seat belts
The belts are locked during heavy
acceleration or deceleration of the
vehicle for the safety of the
occupants.
9 Warning
Fasten seat belt before each trip.
In the event of an accident, people
not wearing seat belts endanger their fellow occupants and
themselves.
Seat belts are designed to be used by only one person at a time. Child
restraint system 3 48.
Periodically check all parts of the belt
system for damage, pollution and
proper functionality.
Have damaged components
replaced. After an accident, have the
belts and triggered belt tensioners
replaced by a workshop.
Notice
Make sure that the belts are not
damaged by shoes or sharp-edged
objects or are trapped. Prevent dirt
from getting into the belt retractors.
Seat belt reminder X 3 80.
Belt force limiters
In the front seats, stress on the body
is reduced by the gradual release of
the belt during a collision.