In such cases, Active Lane Keeping Assist
can:
Rgive an unnecessary warning and then
make a course-correcting brake applica-
tion
Rneither give a warning nor intervene
There is a risk of an accident.
Always pay particular attention to the traffic
situation and keep within the lane, espe-
cially if Active Lane Keeping Assist alerts
you. Terminate the intervention in a non-crit-
ical driving situation.
The system may be impaired or may not func-tion if:
Rthere is poor visibility, e.g. due to insuffi-cient illumination of the road, or due tosnow, rain, fog or heavy spray
Rthere is glare, e.g. from oncoming traffic,the sun or reflection from other vehicles(e.g. if the road surface is wet)
Rthe windshield is dirty, fogged up, damagedor covered, for instance by a sticker, in thevicinity of the camera
Rthere are no lane markings, or severalunclear lane markings are present, e.g.around construction sites
Rthe lane markings are worn away, dark orcovered up, e.g. by dirt or snow
Rthe distance to the vehicle in front is tooshort and thus the lane markings cannot bedetected
Rthe lane markings change quickly, e.g. lanesbranch off, cross one another or merge
Rthe road is narrow and winding
Rthere are highly variable shade conditionson the roadway
Rno vehicle is detected in the adjacent laneand there are broken lane markings
Warning vibration in the steering wheel
A warning may be given if a front wheel passesover a lane marking. You will then be warnedby means of a vibration through the steeringwheel lasting for up to 1.5 seconds.
In order that you are warned only when neces-sary and in good time if you cross the lanemarking, the system detects certain condi-tions and warns you accordingly.
The warning vibration occurs earlier if:
Ryou approach the outer lane marking on abend
Rthe road has very wide lanes, e.g. a freeway
Rthe system detects solid lane markings
The warning vibration occurs later if:
Rthe road has narrow lanes
Ryou cut the corner on a bend
Lane-correcting brake application
GWARNING
A lane-correcting brake application cannot
always bring the vehicle back into the origi-
nal lane. There is a risk of an accident.
Always steer, brake or accelerate yourself,
especially if Active Lane Keeping Assist
warns you or makes a lane-correcting brake
application.
GWARNING
Active Lane Keeping Assist only detects traf-
fic conditions or road users to a limited
extent. In very rare cases, the system may
make an inappropriate brake application,
e.g. after intentionally driving over a solid
lane marking. There is a risk of an accident.
An inappropriate brake application may be
interrupted at any time if you steer slightly
in the opposite direction. Always make sure
that there is sufficient distance on the side
for other traffic or obstacles.
In rare cases, Active Lane Keeping Assistcould detect broken line markings or specialstructures on the road surface as solid lanemarkings. An inappropriate brake applicationcan be interrupted at any time, for example ifyou steer slightly in the opposite direction.
188Driving systems
Driving and parking
Display messagesPossible causes/consequences and P PSolutions
Active Lane Keep‐Active Lane Keep‐ing Assist Cur‐ing Assist Cur‐rently Unavailablerently UnavailableSee Operator's Man‐See Operator's Man‐ualual
Active Lane Keeping Assist is deactivated and temporarily inopera-tive.
Possible causes are:
Rthe windshield in the camera's field of vision is dirty
Rvisibility is impaired due to heavy rain, snow or fog
Rthere have been no lane markings for an extended period
Rthe lane markings are worn away, dark or covered up, e.g. by dirtor snow
When the causes stated above no longer apply, the display messagedisappears.
Active Lane Keeping Assist is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XClean the windshield.
Active Lane Keep‐Active Lane Keep‐ing Assist Inopera‐ing Assist Inopera‐tivetive
Active Lane Keeping Assist is malfunctioning.
XVisit a qualified specialist workshop.
Active Blind SpotActive Blind SpotAssist CurrentlyAssist CurrentlyUnavailable SeeUnavailable SeeOperator's ManualOperator's Manual
Active Blind Spot Assist is temporarily inoperative.
Possible causes are:
Rthe radar sensor system is outside the operating temperaturerange
Rthe radar sensor system is temporarily inoperative, e.g. due toelectromagnetic radiation emitted by nearby TV or radio stationsor other sources of electromagnetic radiation
The yellow cindicator lamps also light up in the exterior mirrors.
When the causes stated above no longer apply, the display messagedisappears.
Active Blind Spot Assist is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XClean the sensors (Ypage 275).
XRestart the engine.
Active Blind SpotActive Blind SpotAssist InoperativeAssist InoperativeActive Blind Spot Assist is malfunctioning.
The yellow cindicator lamps also light up in the exterior mirrors.
XVisit a qualified specialist workshop.
Displaymessages223
On-b oard computer and displays
Z
