Page 26 of 287

24Keys, doors and windows
1. Remove the back cover from theremote control.
2. Extract the flat battery from its location.
3. Replace battery with a battery of the same type. Pay attention to
the installation position.
4. Clip the back cover in place.
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 battery voltage is too low.
● Overload of the central locking system by operating at frequentintervals, the power supply is
interrupted for a short time.
● Interference from higher-power radio waves from other sources.
Manual unlocking 3 25.
Electronic key systemDepending on the version, the
electronic key system enables a
keyless operation of the following
functions:
● central locking system 3 25
● tailgate unlocking
● headlight activation
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 23.
Handle with care, protect from
moisture and high temperatures and
avoid unnecessary operation.
Note
To save battery power, the keyless
functions are set to stand-by after 21
days of non-use. To reactivate the
functions, press a button on the
electronic key.
Replacing battery in electronic
key
Replace the battery as soon as the
system no longer operates properly
or the range is reduced.
Page 27 of 287

Keys, doors and windows25
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
1. Remove the cover.
2. Extract the flat battery from its location.
3. Replace battery with a battery ofthe same type. Pay attention to
the installation position.
4. Clip the cover in place.
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.Central locking system
Unlocks and locks doors, load
compartment and fuel filler flap.
A pull on an interior door handle
unlocks and opens the respective
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
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.
Selective unlocking
Selective unlocking allows you to
unlock either the front doors and the
fuel filler flap or the sliding doors, the
rear doors / the tailgate. Selective
unlocking has to be configured.
Page 131 of 287

Instruments and controls129A minimum set of data including
vehicle and location information will
be sent to the PSAP.
Note
Establishing an emergency call may
not be possible in areas without
sufficient network availability or due
to hardware damage during an
accident.
Automatic crash notification
In case of an accident with airbag
deployment, an automatic
emergency call is established and an
automatic crash notification will be
transmitted to the next public safety answering point.
Emergency assistance
In case of an emergency you can also manually place an emergency call by
pressing the red SOS button for more
than two seconds. The LED flashes to confirm that a connection to the
nearest PSAP is being established.
The LED illuminates steadily as long
as the call is active.
Pressing the SOS button immediately
a second time will terminate the call.
The LED switches off.Status LED
Illuminates green for three seconds
when the ignition is switched on: the system works properly.
Illuminates red: fault in the system.
Contact a workshop.
Flashes red: backup battery needs
replacement.
Breakdown call function Pressing . for more than two
seconds connects you to a roadside
assistance service provider.
For information about coverage and
scope of services of the roadside
assistance, please refer to the
Service and warranty booklet.
Page 282 of 287

280IndexAAccessories and vehicle modifications .......................... 212
Active emergency braking ..116, 188
Adaptive cruise control .......115, 180
AdBlue ................................ 114, 162
Adjustable air vents ...................149
Airbag and belt tensioners .........111
Airbag deactivation ..............65, 111
Airbag label................................... 61 Airbag system .............................. 61
Air conditioning regular operation ................................ 151
Air conditioning system .............. 141
Air intake .................................... 150
Air vents...................................... 149
Antilock brake system ................ 169
Antilock brake system (ABS) .....112
Anti-theft alarm system ................37
Anti-theft locking system .............. 36 Appearance care ........................253
Armrest ......................................... 52
Automatic anti-dazzle ..................41
Automatic crash notification (ACN) ...................................... 128
Automatic light control ...............131
Automatic locking ........................29
Automatic transmission .............165
Autostop ............................. 115, 157B
Battery discharge protection ......138
BlueInjection ............................... 162
Bonnet ....................................... 214
Brake and clutch fluid .................262
Brake assist ............................... 171
Brake fluid .................................. 216 Brakes ............................... 169, 216
Brake system ............................. 112
Breakdown.................................. 251
Bulb replacement ....................... 220
C Camera display........................... 199
Capacities .................................. 270
Cargo management system ........82
Catalytic converter .....................161
Central locking system ................25
Centre console lighting ..............137
Centre high-mounted brake light 229
Changing tyre and wheel size ...240
Charging system ........................ 111
child lock ....................................... 43
Child locks ................................... 29
Child restraint installation locations ................................... 70
Child restraints.............................. 67
Child restraint systems ................67
Child surveillance mirror ...............41
Climate control ............................. 16