Page 231 of 329

Driving and operating229The driver assistance systems donot relieve the driver from full
responsibility for vehicle
operation.
Lane keep assist
Lane keep assist helps to avoid
crashes due to unintentional lane
departures. The front camera
observes the lane markings between
which the vehicle is driving. If the
vehicle approaches a lane marking, the steering wheel is gently turned to
position the vehicle back into the lane. Turn steering wheel in same
direction, if system steering is not
sufficient. Turn steering wheel gently
into opposite direction, if lane change
is intended.
When crossing a lane marking
significantly, lane keep assist starts a
visual and acoustic warning.
Unintended lane departure is
assumed
● without using turn signal
● using the turn signal in the opposite direction of the lane
departure
● 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.
Page 232 of 329

230Driving and operatingThe 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 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 326 of 329

324Headlight flash ........................... 139
Headlight range adjustment ......139
Headlights................................... 136 Headlights when driving abroad 139
Head restraint adjustment .............8
Head restraints ............................ 45
Head-up display.......................... 122 Heated mirrors ............................. 38
Heated rear window ..................... 42
Heated steering wheel .................90
Heated windscreen .......................42
Heating .................................. 54, 55
High beam ......................... 112, 137
High beam assist ................112, 137
Hill start assist ........................... 183
Horn ....................................... 14, 90
I
Identification plate .....................289
Immobiliser .......................... 36, 112
Indicators .................................... 103
Inductive charging ........................96
Info Display ................................. 121
Information displays.................... 114
Instrument cluster ........................98
Instrument panel fuse box .........261
Instrument panel illumination .....257
Instrument panel illumination control .................................... 145
Instrument panel overview ........... 10Interactive driving system ...........186
Interior care ............................... 283
Interior lighting ............................ 145
Interior lights ...................... 145, 257
Interior mirrors .............................. 39
Introduction .................................... 3
J Jump starting ............................. 278
K Key, memorised settings ..............25
Keys ............................................. 20
Keys, locks ................................... 20
L
Lane change alert .......................217
Lane keep assist ................110, 229
Lashing eyes ............................... 81
LED headlights ...........112, 140, 249
Lighting features .........................147
Light switch ................................ 136
Load compartment ................28, 75
Load compartment cover .............78
Loading information .....................86
Low fuel ..................................... 112
M
Malfunction indicator light ..........109
Manual anti-dazzle ......................39
Manual seat adjustment ...............48Manual transmission .................. 179
Massage ....................................... 55
Memorised settings ......................25
Midlevel display .......................... 114
Mirror adjustment ........................... 8 Misted light covers .....................145
N New vehicle running-in ..............163
Number plate light .....................257
O Object detection systems ...........209
Odometer ................................... 104
Oil, engine .......................... 286, 291
OnStar ........................................ 131
Outside temperature ....................93
Overrun cut-off ........................... 167
P Panoramic view system ..............219
Parking ................................ 19, 169
Parking assist ...................... 39, 209
Parking brake ............................ 181
Parking lights ............................. 144
Particulate filter ........................... 170
Pedestrian detection ...................113
Performance .............................. 296
Performing work ........................241
Power button .............................. 164
Power outlets ............................... 95
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