Page 231 of 323

Driving and operating229The system is only operable when a
lane marking is detected.
If the system only detects lane
markings on one side of the road, it
will only assist for this side.
Lane keep assist detects hands-free
driving. In this case a message in the
Driver Information Centre pops-up
and a chime sounds as long as lane
keep assist detects hands-free
driving.
Deactivation The system is deactivated by
pressing a; the LED in the button
extinguishes.
The system is deactivated
automatically when a trailer is
detected.
System limitations The system performance may not
operate properly when:
● Vehicle speed is out of range from 37 to 112 mph.
● Driving on winding or hilly roads.
● During nighttime driving.● Weather limits visibility, such as fog, rain, or snow.
● The sensor in the windscreen is blocked by snow, ice, slush, mud,dirt, windscreen damage or
affected by foreign items, e.g.
stickers.
● The sun is shining directly into the camera lens.
● Close vehicles ahead
● Banked roads
● Road edges
● Roads with poor lane markings ● Sudden lighting changes
● Vehicle modifications, e.g. tyres.
Switch off the system if the system is
disturbed by tar marks, shadows,
road cracks, temporary or
construction lane markings, or other
road imperfections.9 Warning
Always keep your attention on the
road and maintain proper vehicle
position within the lane, otherwise
vehicle damage, injury or death
could occur.
Lane keep assist does not
continuously steer the vehicle.
The system may not keep the
vehicle in the lane or give an alert,
even if a lane marking is detected.
The steering of the lane keep
assist may not be sufficient to
avoid a lane departure.
The system may not detect hands-
off driving due to external
influences (road condition and
surface, weather etc). The driver
has full responsibility to control the vehicle and is always required tokeep the hands on the steeringwheel while driving.
Using the system while towing a
trailer or on slippery roads could
cause loss of control of the vehicle
and a crash. Switch the system off.
Page 234 of 323

232Driving and operating9Danger
Before refuelling, switch off
ignition and any external heaters
with combustion chambers.
Follow the operating and safety
instructions of the filling station
when refuelling.
9 Danger
Fuel is flammable and explosive.
No smoking. No naked flames or
sparks.
If you can smell fuel in your
vehicle, have the cause of this
remedied immediately by a
workshop.
Caution
In case of misfuelling, do not
switch on ignition.
Fuel filler flap is located at right rear
side of vehicle.
The fuel filler flap can only be opened
if the vehicle is unlocked. Release the
fuel filler flap by pushing the flap.
Petrol and Diesel refuelling
Place the nozzle in straight position to the filler neck and press with slight
force to insert.
To refuel, fully insert the pump nozzle
and switch it on.
After the automatic cut-off, the tank
can be topped up by operating the
pump nozzle a maximum of two more
times.Caution
Wipe off any overflowing fuel
immediately.
Close the flap and allow it to engage.
Misfuel inhibitor
9 Warning
Do not try to open the flap of the
fuel filler neck manually on
vehicles with misfuel inhibitor.
Disregarding this could lead to
trapping of the fingers.
All vehicles are equipped with a
misfuel inhibitor.
Page 267 of 323

Vehicle care265Vehicle loading statusAdjust tyre pressure to load condition
according tyre information label or
tyre pressure chart 3 300, and select
the appropriate setting in the Tyre
loading page under the Settings
menu in the Driver Information Centre 3 112. This setting determines the
reference pressures for the tyre
pressure warnings.
Depending on the display, the menu
Tyre loading only appears if the
vehicle is at a standstill and the
parking brake is applied. On vehicles
with automatic transmission the
selector lever must be in P.Select:
● Light for comfort pressure up to
3 people.
● Eco for Eco pressure up to
3 people.
● Max for full loading.
Auto learn function After changing wheels or wheel
positions the vehicle must be
stationary for approx. 20 minutes,
before the system recalculates. The
following relearn process takes up to
10 minutes of driving in a speed range
of 25 to 60 mph. Avoid to drive outside
of this range for a longer time. If
possible, use a country road or similar which allows continuous driving.
During relearn process $ can be
displayed or pressure values can
swap in the Driver Information Centre.
If problems occur during the relearn
process, a failure message is
displayed in the Driver Information
Centre. w will flash for 60 seconds
and then illuminate continuously.If this happens, repeat learning
process. Keep your vehicle stationary for approx. 20 minutes and then drive
again for 10 minutes as described
above.
Tread depth
Check tread depth at regular
intervals.
Tyres should be replaced for safety
reasons at a tread depth of 2-3 mm
(4 mm for winter tyres).
For safety reasons, it is
recommended that the tread depth of
the tyres on one axle should not vary
by more than 2 mm.
Page 318 of 323

316IndexAAccessories and vehicle modifications .......................... 237
Active bonnet ................................ 69
Active emergency braking ..........201
Adaptive cruise control .......111, 189
AdBlue ................................ 109, 170
Adjustable air vents ...................157
Airbag and belt tensioners .........106
Airbag deactivation ..............61, 106
Airbag label................................... 56
Airbag system .............................. 56
Air conditioning regular operation ................................ 159
Air conditioning system .............. 148
Air intake .................................... 158
Air vents...................................... 157
All-wheel drive ........................... 178
Antilock brake system ................ 178
Antilock brake system (ABS) .....108
Anti-theft alarm system ................32
Anti-theft locking system .............. 32
Appearance care ........................279
Armrest ................................... 51, 53
Armrest storage ........................... 72
Ashtrays ....................................... 95 Automatic anti-dazzle ..................38
Automatic dimming ......................37
Automatic light control ...............135
Automatic locking ........................25Automatic transmission .............173
Autostop ..................................... 165
Auxiliary heater ........................... 157
B Baselevel display ........................112
Battery discharge protection ......146
Battery voltage ........................... 124
Belts.............................................. 54 BlueInjection ............................... 170
Bonnet ....................................... 239
Brake and clutch fluid .................283
Brake and clutch system ...........107
Brake assist ............................... 180
Brake fluid .................................. 242
Brakes ............................... 178, 242
Breakdown.................................. 277
Bulb replacement ....................... 245
C Capacities .................................. 299
Cargo management system ........79
Catalytic converter .....................169
Central locking system ................21
Centre console lighting ..............145
Centre console storage ...............72
Changing tyre and wheel size ...266
Charging system ........................ 107
Child locks ................................... 26
Child restraint installation locations ................................... 65