Page 26 of 283
24Keys, doors and windows
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 26.Electronic key system
Page 27 of 283

Keys, doors and windows25Depending on the version, the
electronic key system enables a
keyless operation of the following functions:
● central locking system 3 26
● 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 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.
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 26.
Page 278 of 283

276IndexAAccessories and vehicle modifications .......................... 214
Active emergency braking ..110, 182
Adaptive cruise control .......110, 174
AdBlue ................................ 108, 155
Adjustable air vents ...................143
Advanced parking assist ............190
Airbag and belt tensioners .........104
Airbag deactivation ..............65, 105
Airbag label................................... 60 Airbag system .............................. 60
Air conditioning regular operation ................................ 144
Air conditioning system .............. 134
Air intake .................................... 144
Air vents...................................... 143
Antilock brake system ................ 162
Antilock brake system (ABS) .....107
Anti-theft alarm system ................36
Anti-theft locking system .............. 36 Appearance care ........................250
Armrest ......................................... 52
Ashtrays ....................................... 99
Automatic anti-dazzle ..................41
Automatic crash notification (ACN) ...................................... 122
Automatic light control ...............125
Automatic locking ........................29Automatic transmission .............158
Autostop ............................. 109, 150
B Battery discharge protection ......132
BlueInjection ............................... 155
Bonnet ....................................... 216
Brake and clutch system ...........106
Brake assist ............................... 165
Brake fluid .......................... 219, 257
Brakes ............................... 162, 219
Breakdown.................................. 247
Bulb replacement ....................... 222
C Capacities .................................. 266
Cargo management system ........81
Catalytic converter .....................154
Central locking system ................26
Centre console lighting ..............131
Centre console storage ...............76
Changing tyre and wheel size ...237
Charging system ........................ 105
Child locks ................................... 29
Child restraint installation locations ................................... 69
Child restraints.............................. 66
Child restraint systems ................66
Child surveillance mirror ...............41
Cigarette lighter ........................... 98
Climate control ............................. 17