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The support provided by the system can be
impaired if:
R
there is poor visibility, e.g. due to insuffi-
cient illumination of the road, or due to
snow, rain, fog or heavy spray
R
there is glare, e.g. from oncoming traffic,
the sun or reflection from other vehicles
(e.g. if the road surface is wet)
R
the windshield is dirty, fogged up, damaged
or covered, for instance by a sticker, in the
vicinity of the camera
R
there are no lane markings, or several
unclear lane markings are present, e.g.
around construction sites
R
the lane markings are worn away, dark or
covered up, e.g. by dirt or snow
R
the distance to the vehicle in front is too
short and thus the lane markings cannot be
detected
R
the lane markings change quickly, e.g. lanes
branch off, cross one another or merge
R
the road is narrow and winding
R
there are highly variable shade conditions
on the roadway
The system is switched to passive and no lon-
ger assists you by performing steering inter-
ventions if:
R
you actively change lanes
R
you switch on the turn signal
R
you take your hands off the steering wheel
or do not steer for a prolonged period of
time
i
After you have finished changing lanes,
Active Steering Assist is automatically active
once more.
Active Steering Assist cannot provide assis-
tance:
R
on very sharp corners
R
when a loss of tire pressure or a defective
tire has been detected and displayed
Observe the important safety notes on Active
Distance Assist DISTRONIC (Y page 156).
The steering interventions are carried out with
a limited steering moment. The system
requires the driver to keep his hands on the
steering wheel and to steer himself.
If you do not steer yourself or if you take your
hands off the steering wheel for a prolonged
period of time, the system will first alert you
with a visual warning. A steering wheel symbol
appears in the multifunction display. If you
have still not started to steer and have not
taken hold of the steering wheel after five sec-
onds at the latest, a warning tone also sounds
to remind you to take control of the vehicle.
Active Steering Assist is then switched to pas-
sive. Active Distance Assist DISTRONIC
remains active.
Activating Active Steering Assist
X
Select the Active Distance Assist
DISTRONIC with Active Steering Assist func-
tion using the on-board computer
(Y page 198).
The Active Steering Assist OnActive Steering Assist On mes-
sage appears in the multifunction display.
Active Steering Assist is activated.
Information in the multifunction display
If Active Steering Assist is activated but not
ready for a steering intervention, steering
wheel symbol : appears in gray. If the sys-
tem provides you with support by means of
steering interventions, symbol : is shown in
green.
Deactivating Active Steering Assist
X
Deactivate the Active Distance Assist
DISTRONIC with Active Steering Assist func-
tion using the on-board computer
(Y page 198).
The Active Steering Assist Off
Active Steering Assist Off mes-
sage appears in the multifunction display.
Active Steering Assist is deactivated.
When Active Distance Assist DISTRONIC is
deactivated or not available, Active Steering
Assist is deactivated automatically.
164
Driving systems
Driving and parking
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