Page 25 of 279
Keys, doors and windows23
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
1. Remove the back cover from the remote control.
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 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 25.Electronic key system
Page 26 of 279

24Keys, doors and windowsDepending on the version, the
electronic key system enables a
keyless operation of the following
functions:
● central locking system 3 25
● tailgate unlocking
● ignition switching on and starting the engine 3 147
● 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 22.
Handle with care, protect from
moisture and high temperatures and
avoid unnecessary operation.
Replacing battery in electronic
key
Replace the battery as soon as the
system no longer operates properly
or the range is reduced.
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.
Page 274 of 279

272Index.................................................... 229
A Accessories and vehicle modifications .......................... 210
Active emergency braking ..111, 181
Adaptive cruise control .......110, 173
AdBlue ................................ 109, 153
Adjustable air vents ...................140
Advanced parking assist ............189
Airbag and belt tensioners .........105
Airbag deactivation ..............64, 105
Airbag label................................... 59 Airbag system .............................. 59
Air conditioning regular operation ................................ 142
Air conditioning system .............. 132
Air intake .................................... 142
Air vents...................................... 140
Antilock brake system ................ 160
Antilock brake system (ABS) .....107
Anti-theft alarm system ................35
Anti-theft locking system .............. 35 Appearance care ........................245
Armrest ......................................... 51
Ashtrays ....................................... 97
Automatic anti-dazzle ..................40
Automatic light control ...............123
Automatic locking ........................28Automatic transmission .............156
Autostop ............................. 110, 148
B Battery discharge protection ......130
Battery voltage ........................... 118
BlueInjection ............................... 153
Bonnet ....................................... 212
Brake and clutch fluid .................252
Brake and clutch system ...........106
Brake assist ............................... 164
Brake fluid .................................. 215
Brakes ............................... 160, 215
Breakdown.................................. 243
Bulb replacement ....................... 218
C Capacities .................................. 262
Cargo management system ........80
Catalytic converter .....................153
Central locking system ................25
Centre console lighting ..............129
Centre console storage ...............74
Changing tyre and wheel size ...233
Charging system ........................ 105
Child locks ................................... 29
Child restraint installation locations ................................... 68
Child restraints.............................. 65
Child restraint systems ................65
Child surveillance mirror ...............40