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.
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.
318Headlight 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 ............................. 38
Heated rear window ..................... 41
Heated steering wheel .................89
Heated windscreen .......................42
Heating .................................. 53, 54
High beam ......................... 111, 136
High beam assist ................111, 136
Hill start assist ........................... 182
Horn ....................................... 14, 89
I
Identification plate .....................288
Immobiliser .......................... 36, 111
Indicators .................................... 102
Inductive charging ........................95
Info display ................................. 120
Information displays.................... 113
Instrument cluster ........................97
Instrument panel fuse box .........260
Instrument panel illumination .....256
Instrument panel illumination control .................................... 144
Instrument panel overview ........... 10Interactive 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 .......................217
Lane keep assist ................109, 229
Lashing eyes ............................... 80
LED headlights ...........111, 139, 248
Lighting features .........................146
Light switch ................................ 135
Load compartment ................28, 74
Load compartment cover .............77
Loading information .....................85
Low fuel ..................................... 111
M Malfunction indicator light ..........108
Manual anti-dazzle ......................38
Manual seat adjustment ...............47
Manual transmission .................. 178
Massage ....................................... 54Memorised 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 ..............219
Parking ................................ 19, 168
Parking assist ......................38, 207
Parking brake ............................ 180
Parking lights ............................. 143
Particulate filter ........................... 169
Pedestrian detection ...................112
Performance .............................. 294
Performing work ........................240
Power button .............................. 163
Power outlets ............................... 94
Power seat adjustment ................49
Power windows ............................ 39
320Turn and lane-change signals ...142
Turn signal ................................. 106
Tyre chains ................................ 267
Tyre designations ......................263
Tyre pressure ............................ 263
Tyre pressure monitoring system ............................. 110, 264
Tyre pressures ........................... 301
Tyre repair kit ............................. 268
U Ultrasonic parking assist............. 207
Upholstery .................................. 282
Uplevel display ........................... 113
Using this manual ..........................3
V
Valet mode ................................. 120
Vehicle battery ........................... 244
Vehicle checks............................ 240
Vehicle data ................................ 290
Vehicle data recording and privacy ..................................... 314
Vehicle detected ahead ..............112
Vehicle dimensions .................... 299
Vehicle Identification Number ....288
Vehicle jack ................................ 261
Vehicle messages .....................124
Vehicle personalisation .............126
Vehicle security ............................ 33
Vehicle specific data ......................3Vehicle storage ........................... 239
Vehicle tools ............................... 261
Vehicle unlocking ........................... 6 Vehicle weight ........................... 296
Ventilating ..................................... 53
W
Warning chimes .........................125
Warning lights ............................. 102
Warning triangle .......................... 83
Washer and wiper systems .........14
Washer fluid ............................... 243
Wheel changing .........................272
Wheel covers ............................. 267
Wheels and tyres .......................262
Windows ....................................... 39
Windscreen................................... 39
Windscreen wiper/washer ...........89
Winter tyres ............................... 262
Wiper blade replacement ..........245