Page 227 of 323

Driving and operating225Note
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 228 of 323

226Driving 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 320 of 323

318HHalogen headlights ....................244
Hand brake ................................. 175
Hazard warning flashers ............139
Headlight flash ........................... 137
Headlight range adjustment ......137
Headlights................................... 134
Headlights when driving abroad 137
Head restraint adjustment .............8
Head restraints ............................ 45
Head-up display.......................... 120 Heated mirrors ............................. 38
Heated rear window ..................... 42
Heated steering wheel .................88
Heated windscreen .......................42
Heating .................................. 54, 55
High beam ......................... 110, 135
High beam assist ................110, 135
Hill start assist ........................... 177
Horn ....................................... 14, 89
I
Identification plate .....................286
Immobiliser .......................... 36, 110
Indicators .................................... 101
Inductive charging ........................94
Info Display ................................. 118
Instrument cluster ........................96
Instrument panel fuse box .........258Instrument panel illumination
control .................................... 141
Instrument panel overview ........... 10
Interactive driving system ...........180
Interior care ............................... 281
Interior lighting ............................ 141
Interior lights ...................... 142, 254
Interior mirrors .............................. 39
Interruption of power supply ......173
Introduction .................................... 3
J
Jump starting ............................. 275
K Key, memorised settings ..............25
Keys ............................................. 20
Keys, locks ................................... 20
L
Lane change alert .......................213
Lane keep assist ................108, 224
Lashing eyes ............................... 80
LED headlights ...........110, 138, 246
Lighting features .........................143
Light switch ................................ 134
Load compartment ................29, 75
Load compartment cover .............78
Loading information .....................85
Low fuel ..................................... 110M
Malfunction indicator light ..........107
Manual anti-dazzle ......................39
Manual mode ............................. 171
Manual seat adjustment ...............48
Manual transmission .................. 174
Massage ....................................... 55
Memorised settings ......................25
Midlevel display .......................... 112
Mirror adjustment ........................... 8
Misted light covers .....................141
N New vehicle running-in ..............158
Number plate light .....................254
O Object detection systems ...........205
Odometer ................................... 102
Oil, engine .......................... 284, 288
OnStar ........................................ 129
Outside temperature ....................92
Overrun cut-off ........................... 162
P
Panoramic view system ..............215
Parking ................................ 19, 164
Parking assist ...................... 39, 205
Parking brake ............................ 176
Parking lights ............................. 141
Particulate filter ........................... 165
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