228Driving and operatingThe 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.
Notice
The system is switched off during
detection of ambiguous lane
markings, e.g. in construction areas.
Notice
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 37 mph and
112 mph 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.
Driving and operating229The 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 37 to 112 mph.
● 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 ........................... 137
Headlight range adjustment ......137
Headlights................................... 134 Headlights when driving abroad 137
Head restraint adjustment .............8
Head restraints ............................ 43
Head-up display.......................... 121 Heated mirrors ............................. 37
Heated rear window ..................... 40
Heated steering wheel .................88
Heated windscreen .......................41
Heating .................................. 52, 53
High beam ......................... 110, 135
High beam assist ................110, 135
Hill start assist ........................... 181
Horn ....................................... 13, 88
I
Identification plate .....................286
Immobiliser .......................... 35, 110
Indicators .................................... 101
Inductive charging ........................94
Info display ................................. 119
Information displays.................... 112
Instrument cluster ........................96
Instrument panel fuse box .........259
Instrument panel illumination .....255
Instrument panel illumination control .................................... 143
Instrument panel overview ........... 10Interactive driving system ...........183
Interior care ............................... 281
Interior lighting ............................ 143
Interior lights ...................... 143, 255
Interior mirrors .............................. 37
Introduction .................................... 3
J
Jump starting ............................. 276
K
Key, memorised settings ..............21
L
Lane change alert .......................216
Lane keep assist ................108, 228
Lashing eyes ............................... 79
LED headlights ...........110, 138, 247
Lighting features .........................145
Light switch ................................ 134
Load compartment ................27, 73
Load compartment cover .............76
Loading information .....................84
Low fuel ..................................... 110
M Malfunction indicator light ..........107
Manual anti-dazzle ......................37
Manual seat adjustment ...............46
Manual transmission .................. 177
Massage ....................................... 53Memorised settings......................21
Midlevel display .......................... 112
Mirror adjustment ........................... 8
Misted light covers .....................143
N New vehicle running-in ..............161
Number plate light .....................255
O Object detection systems ...........206
Odometer ................................... 102
Oil, engine .......................... 283, 288
OnStar ........................................ 129
Outside temperature ....................91
Overrun cut-off ........................... 164
P Panoramic view system ..............218
Parking ................................ 18, 167
Parking assist ......................37, 206
Parking brake ............................ 179
Parking lights ............................. 142
Particulate filter ........................... 168
Pedestrian detection ...................111
Performance .............................. 293
Performing work ........................239
Power button .............................. 162
Power outlets ............................... 93
Power seat adjustment ................48
Power windows ............................ 38
320Turn and lane-change signals ...141
Turn signal ................................. 105
Tyre chains ................................ 266
Tyre designations ......................262
Tyre pressure ............................ 262
Tyre pressure monitoring system ............................. 109, 263
Tyre pressures ........................... 300
Tyre repair kit ............................. 267
U Ultrasonic parking assist............. 206
Upholstery .................................. 281
Uplevel display ........................... 112
Using this manual ..........................3
V
Valet mode ................................. 119
Vehicle battery ........................... 243
Vehicle checks............................ 239
Vehicle data ................................ 288
Vehicle data recording and privacy ..................................... 313
Vehicle detected ahead ..............111
Vehicle dimensions .................... 298
Vehicle Identification Number ....286
Vehicle jack ................................ 260
Vehicle messages .....................123
Vehicle personalisation .............125
Vehicle security ............................ 32
Vehicle specific data ......................3Vehicle storage ........................... 238
Vehicle tools ............................... 260
Vehicle unlocking ........................... 6 Vehicle weight ........................... 295
Ventilating ..................................... 52
W
Warning chimes .........................124
Warning lights ............................. 101
Warning triangle .......................... 82
Washer and wiper systems .........13
Washer fluid ............................... 242
Wheel changing .........................271
Wheel covers ............................. 266
Wheels and tyres .......................261
Windows ....................................... 38
Windscreen................................... 38
Windscreen wiper/washer ...........88
Winter tyres ............................... 261
Wiper blade replacement ..........244