Page 25 of 283
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 283

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 3 148
● 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 278 of 283

276IndexAAccessories and vehicle modifications .......................... 212
Active emergency braking ..110, 182
Adaptive cruise control .......109, 174
AdBlue ................................ 107, 154
Adjustable air vents ...................141
Advanced parking assist ............190
Airbag and belt tensioners .........103
Airbag deactivation ..............64, 104
Airbag label................................... 59 Airbag system .............................. 59
Air conditioning regular operation ................................ 143
Air conditioning system .............. 133
Air intake .................................... 143
Air vents...................................... 141
Antilock brake system ................ 161
Antilock brake system (ABS) .....106
Anti-theft alarm system ................35
Anti-theft locking system .............. 35 Appearance care ........................247
Armrest ......................................... 51
Ashtrays ....................................... 97
Automatic anti-dazzle ..................40
Automatic light control ...............124
Automatic locking ........................28
Automatic transmission .............157
Autostop ............................. 108, 149B
Battery discharge protection ......131
Battery voltage ........................... 117
BlueInjection ............................... 154
Bonnet ....................................... 214
Brake and clutch fluid .................255
Brake and clutch system ...........105
Brake assist ............................... 165
Brake fluid .................................. 217
Brakes ............................... 161, 217
Breakdown.................................. 245
Bulb replacement ....................... 220
C Capacities .................................. 265
Cargo management system ........80
Catalytic converter .....................154
Central locking system ................25
Centre console lighting ..............130
Centre console storage ...............75
Changing tyre and wheel size ...235
Charging system ........................ 104
Child locks ................................... 28
Child restraint installation locations ................................... 68
Child restraints.............................. 65
Child restraint systems ................65
Child surveillance mirror ...............40
Cigarette lighter ........................... 96
Climate control ............................. 16