Page 221 of 315

Driving and operating219Note
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.
Activation
The 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 lights 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.
Indication on Driver Assistance page
If the system is active but one or both
lanes are not detected, they appear
as a line of hollow dashes, as shown
on the right side of the vehicle in the
graphic above.
Page 222 of 315

220Driving and operatingIf the system detects a lane, it
appears as a green dashed line, as
shown on the right side of the vehicle in the graphic above. This dashed line
becomes amber if the vehicle
approaches a detected lane marking
without the turn lights in that direction
has been used.
If the system intervenes by steering, a short amber line appears, as shown on the left side of the vehicle in the
graphic above.
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
60 to 180 km/h
● 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 312 of 315

310HHalogen headlights ....................238
Hand brake ................................. 170
Hazard warning flashers ............134
Headlight flash ........................... 132
Headlight range adjustment ......132
Headlights................................... 129
Headlights when driving abroad 132
Head restraint adjustment .............8
Head restraints ............................ 46
Head-up display.......................... 118 Heated mirrors ............................. 40
Heated rear window ..................... 43
Heated steering wheel .................89
Heated windscreen .......................44
Heating .................................. 55, 56
High beam ......................... 110, 130
High beam assist ................110, 130
Hill start assist ........................... 173
Horn ....................................... 14, 90
I
Identification plate .....................281
Ignition switch positions .............152
Immobiliser .......................... 38, 110
Indicators .................................... 101
Inductive charging ........................95
Info Display ................................. 117
Instrument cluster ........................97
Instrument panel fuse box .........252Instrument panel illumination
control .................................... 136
Instrument panel overview ........... 10
Interactive driving system ...........176
Interior care ............................... 275
Interior lighting ............................ 136
Interior lights ...................... 137, 248
Interior mirrors .............................. 40
Interruption of power supply ......168
Introduction .................................... 3
J
Jump starting ............................. 269
K
Key, memorised settings ..............26
Keys ............................................. 21
Keys, locks ................................... 21
L
Lane change alert .......................207
Lane keep assist ................108, 218
Lashing eyes ............................... 81
LED headlights ...........110, 133, 240
Lighting features .........................138
Light switch ................................ 129
Load compartment ................30, 76
Load compartment cover .............79
Loading information .....................86
Low fuel ..................................... 109M
Malfunction indicator light ..........106
Manual anti-dazzle ......................40
Manual mode ............................. 166
Manual seat adjustment ...............49
Manual transmission .................. 169
Massage ....................................... 56
Memorised settings ......................26
Mirror adjustment ........................... 8
Misted light covers .....................136
N New vehicle running-in ..............152
Number plate light .....................248
O
Object detection systems ...........199
Odometer ................................... 102 Oil, engine .......................... 279, 283
Outside temperature ....................93
Overrun cut-off ........................... 157
P Panoramic view system ..............209
Parking ................................ 19, 159
Parking assist ...................... 40, 199
Parking brake ............................ 171
Parking lights ............................. 136
Particulate filter ........................... 160
Pedestrian detection ...................111
Performance .............................. 288
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