Page 25 of 263

Keys, doors and windows23
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.● Electronic key is out of reception range.
● 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 24.Electronic key system
Enables a keyless operation of the
following functions:
● central locking system 3 24
● power tailgate 3 30
● ignition switching on and starting the engine 3 137
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 22.
Handle with care, protect from
moisture and high temperatures and
avoid unnecessary operation.
Page 26 of 263

24Keys, doors and windowsReplacing battery in electronic
key
Replace 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 3 103.
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 of the 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 24.
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.
Notice
A short time after unlocking with the
remote control the doors are locked
automatically if no door has been
Page 30 of 263

28Keys, doors and windowsOperation with the key in case of
a central locking system fault
In case of a fault, e.g. vehicle battery
or remote control/electronic key
battery is discharged, the driver's
door can be locked or unlocked with
the mechanical key.
Manual unlocking
Electronic key: press and hold the
latch to extract the integral key.
Manually unlock the driver's door by
inserting and turning the key in the
lock cylinder.
The other doors can be opened by
pulling the interior handle. The load
compartment and fuel filler flap will
possibly not be unlocked.
By switching on the ignition, the anti- theft locking system is deactivated.
Manual locking
Manually lock the driver's door by
inserting and turning the key in the lock cylinder.
To lock the other doors, remove the
black cover by using a key.
Insert key carefully and move to the
inner side of the door without turning
the key.
Remove key and attach black cover.
The fuel filler flap and tailgate are
possibly not locked.
Automatic locking Automatic locking after driving off This system allows automatic
simultaneous locking of the doors and
boot as soon as the speed of the
vehicle exceeds 10 km/h.
Page 138 of 263

136Driving and operating9Warning
If the vehicle battery is discharged,
the vehicle must not be towed,
tow-started or jump-started as the
steering wheel lock cannot be
disengaged.
Operation on vehicles with
electronic key system in case of
failure
If either the electronic key fails or the
battery of the electronic key is weak,
the Driver Information Centre may
display No Remote Detected or
Replace Battery in Remote Key when
you try to start the vehicle.
Hold the electronic key with buttons outside at the marking on the steering column cover as shown in the
illustration.
Depress the clutch pedal (manual
transmission) or the brake pedal
(automatic transmission or manual
transmission automated) and press
Start/Stop button to start the engine.
This option is intended for
emergencies only. Replace the
electronic key battery as soon as
possible 3 23.
For unlocking or locking the doors,
see fault in radio remote control unit
or electronic key system 3 24.
Power saving mode
This function manages the duration of
using certain systems to avoid
discharging of the vehicle battery.
After the engine has stopped, some
systems can still be used such as the audio and telematics system,
windscreen wipers, dipped beam
headlamps, courtesy lamps, etc. for a total maximum time of about forty
minutes.
Changing into power saving
mode
When a certain discharging status of
the vehicle battery is achieved, the
active functions are switched in
standby mode. A message appears in the Driver Information Centre
indicating Power saving mode .
A telephone call being made at this
time will be maintained for around 10
minutes with the Bluetooth handsfree
system of the Infotainment system.
Page 262 of 263

260Tyre pressures ........................... 247
Tyre repair kit ............................. 221
U Ultrasonic parking assist............. 174
Upholstery .................................. 233
Using this manual ..........................3
V Valet mode ................................. 101
Vehicle battery ........................... 207
Vehicle checks............................ 204
Vehicle data ................................ 240
Vehicle data recording and privacy ..................................... 254
Vehicle detected ahead ................99
Vehicle dimensions .................... 245
Vehicle Identification Number ....238
Vehicle jack ................................ 216
Vehicle messages .....................103
Vehicle personalisation .............104
Vehicle security ............................ 35
Vehicle specific data ......................3
Vehicle storage ........................... 203
Vehicle tools ............................... 216
Vehicle unlocking ........................... 6
Vehicle weight ........................... 244
Ventilating ..................................... 51
Ventilation ................................... 123W
Warning chimes .........................103
Warning lights ............................... 89
Warning triangle .......................... 75
Washer and wiper systems .........13
Washer fluid ............................... 207
Wheel changing .........................224
Wheel covers ............................. 220
Wheels and tyres .......................217
Windows ....................................... 40
Windscreen................................... 40
Windscreen wiper/washer ...........80
Winter tyres ............................... 217
Wiper blade replacement ..........209