Driving and operating229● without braking
● without acceleration
● without active steering.
Note
The system is switched off during
detection of ambiguous lane
markings, e.g. in construction areas.
Note
The system may be switched off if it
detects lanes which are too narrow,
too wide or too curved.
ActivationThe lane keep assist is activated by
pressing a. The LED in the button
illuminates to indicate that the system
is switched on.
When the control indicator a in the
instrument cluster or in the head-up display illuminates green, the system
is ready to assist.
The system is operational at vehicle
speeds between 60 km/h and
180 km/h and if lane markings are
available.
The system gently turns the steering
wheel and the control indicator a
changes to yellow, if the vehicle
approaches a detected lane marking
without using the turn signal in that
direction.
The system alerts by flashing a
together with three chimes, from the
respective direction, if the lane is
departed significantly.
The 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.
System limitationsThe system performance may not
operate properly when:
● Vehicle speed is out of range from 60 to 180 km/h.
● Driving on winding or hilly roads.
● During nighttime driving.
● Weather limits visibility, such as fog, rain, or snow.
230Driving and operating● The sensor in the windscreen isblocked 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.Fuel
Fuel for petrol engines Only use unleaded fuel that complies
with European standard EN 228 or equivalent.
The engine is capable of running with fuel that contains up to 10% ethanol
(e.g. named E10).
Use fuel with the recommended
octane rating. A lower octane rating
can reduce engine power and torque
and slightly increases fuel
consumption.Caution
Do not use fuel or fuel additives
that contain metallic compounds
such as manganese-based
additives. This may cause engine
damage.
238Driving and operatingrelease handle is impossible toguide to its hidden initial position in the housing or if the buzzing tone
sounds after engaging the
coupling ball bar, seek the
assistance of a workshop.
Eye for break-away stopping cable
Attach break-away stopping cable to
eye.
Trailer stability assist
If the system detects snaking
movements, engine power is reduced
and the vehicle/trailer combination is
selectively braked until the snaking ceases. While the system is working
keep steering wheel as still as
possible.
Trailer stability assistant is a function
of the Electronic Stability Control
3 183.
Vehicle care259No.Circuit18Sunblind19Power seat, driver20–21Sunroof22Rear wiper/Airbag23Adaptive forward lighting24–25–26Transmission control module27Ignition/Instrument panel28–29Rear view camera/Air vent30Malfunction indicator light/
Trailer31–32Camera33Seat heat front34Seat heat rearNo.Circuit35Damping/All-wheel drive36Fuel system37–38–39–40Steering wheel lock41–42–43Heated steering wheel44Headlight range adjustment45–46Engine control module47–48DC/DC converter/Air vent/E-
Boost49Rear door control module50–51–No.Circuit52–53–54–55–56Starter57–58–59Left headlight (LED)60Cooling fan61–62–63–64–65Climate control66–67–68–
Vehicle care261
In right-hand drive vehicles, the fuse
box is located behind a cover in the
glovebox. Open the glovebox and
remove the cover.
No.Circuit1Left power window2Right power window3Body control module4Climate control fan5Body control module6Trailer provisions7Rear seat power folding8Body control module9Engine control module10Head-up display11NO x reduction/Pipe heater12NO
x reduction/Soot sensor13UREA module14Heated steering wheel15Transmission control module16Amplifier17AlarmNo.Circuit18Body control module19UREA module20Body control module21Body control module22Body control module23Electric steering wheel lock24Airbag25Diagnostic connector26Power outlet load compartment27EBCM valve28Police provision29–30–31Steering wheel controls32Ignition switch33Climate control34Central gateway module
268Vehicle care9Warning
The use of unsuitable tyres or
wheels may lead to accidents and will invalidate the vehicle
operating permit.
Wheel covers
Wheel covers and tyres that are
factory approved for the respective
vehicle and comply with all of the
relevant wheel and tyre combination
requirements must be used.
If the wheel covers and tyres used are
not factory approved, the tyres must
not have a rim protection ridge.
Wheel covers must not impair brake
cooling.
9 Warning
Use of unsuitable tyres or wheel
covers could lead to sudden
pressure loss and thereby
accidents.
Vehicles with steel wheels: When
using locking wheel nuts, do not
attach wheel covers.
Tyre chains
Tyre chains are only permitted on the
front wheels.
Always use fine mesh chains that add no more than 10 mm to the tyre tread
and the inboard sides (including chain lock).
9 Warning
Damage may lead to tyre blowout.
Tyre chains are only permitted on
tyres of size 215/60 R16, 215/55 R17 ,
225/55 R17 M+S and 235/45 R18.
Temporary spare wheel
The use of tyre chains is not permitted on the temporary spare wheel.
Tyre repair kit
Minor damage to the tyre tread can be
repaired with the tyre repair kit.
Do not remove foreign bodies from
the tyres.
Tyre damage exceeding 4 mm or that is at tyre's side wall cannot be
repaired with the tyre repair kit.9 Warning
Do not drive faster than 80 km/h.
Do not use for a lengthy period.
Steering and handling may be
affected.
Vehicle care279
Screw in the towing eye as far as it will
go until it stops in a horizontal
position.
Attach a tow rope – or better still a tow
rod – to the towing eye.
The towing eye must only be used for towing and not for recovering the
vehicle.
Switch on ignition to release steering
wheel lock and to permit operation of
brake lights, horn and windscreen
wiper.
Transmission in neutral.
Caution
Drive slowly. Do not drive jerkily.
Excessive tractive force can
damage the vehicle.
When the engine is not running,
considerably more force is needed to
brake and steer.
To prevent the entry of exhaust gases from the towing vehicle, switch on the
air recirculation and close the
windows.
Vehicles with manual transmission
and All-wheel drive: If the vehicle is
towed with all four wheels on the
ground then there are no technical
limitations for speed and distance. If
only one axle has been raised, the
maximum speed is 50 km/h. There is
no distance limitation.
Vehicles with automatic transmission and All-wheel drive: The vehicle must
be towed facing forwards. If the
vehicle is towed with all four wheels
on the ground, the maximum speed is 50 km/h and for a maximum of
50 km. If the front axle has been
raised, the maximum speed is
50 km/h. There is no distance
limitation.
Seek the assistance of a workshop.
After towing, unscrew the towing eye.
Iinsert cap with the outer flange into
the recess and fix cap by pushing.
Towing another vehicle
Disengage cap at bottom and remove downwards.
The towing eye is stowed with the
vehicle tools 3 262.
318HHalogen headlights ....................248
Hand brake ................................. 179
Hazard warning flashers ............142
Headlight flash ........................... 138
Headlight range adjustment ......138
Headlights................................... 135
Headlights when driving abroad 138
Head restraint adjustment .............8
Head restraints ............................ 44
Head-up display.......................... 122 Heated mirrors ............................. 37
Heated rear window ..................... 41
Heated steering wheel .................89
Heated windscreen .......................41
Heating .................................. 52, 54
High beam ......................... 111, 136
High beam assist ................111, 136
Hill start assist ........................... 182
Horn ....................................... 14, 89
I
Identification plate .....................288
Immobiliser .......................... 35, 111
Indicators .................................... 102
Inductive charging ........................95
Info display ................................. 120
Information displays.................... 113
Instrument cluster ........................97
Instrument panel fuse box .........260Instrument panel illumination .....256
Instrument panel illumination control .................................... 144
Instrument panel overview ........... 10
Interactive driving system ...........184
Interior care ............................... 282
Interior lighting ............................ 144
Interior lights ...................... 144, 256
Interior mirrors .............................. 38
Introduction .................................... 3
J
Jump starting ............................. 277
K
Key, memorised settings ..............22
L Lane change alert .......................216
Lane keep assist ................109, 228
Lashing eyes ............................... 80
LED headlights ...........111, 139, 250
Lighting features .........................146
Light switch ................................ 135
Load compartment ................27, 74
Load compartment cover .............77
Loading information .....................85
Low fuel ..................................... 111M
Malfunction indicator light ..........108
Manual anti-dazzle ......................38
Manual seat adjustment ...............47
Manual transmission .................. 178
Massage ....................................... 53
Memorised settings ......................22
Midlevel display .......................... 113
Mirror adjustment ........................... 8
Misted light covers .....................144
N
New vehicle running-in ..............162
Number plate light .....................256
O Object detection systems ...........207
Odometer ................................... 103
Oil, engine .......................... 285, 290
OnStar ........................................ 130
Outside temperature ....................92
Overrun cut-off ........................... 165
P Panoramic view system ..............218
Parking ................................ 19, 168
Parking assist ............................ 207
Parking brake ............................ 180
Parking lights ............................. 143
Particulate filter ........................... 169
Pedestrian detection ...................112