Mercedes-Benz GLB Owner's Manual page 253

250 Driving and parking
If the system detects that the driver has not
steered the vehicle for a considerable period of
time or has removed their hands from the steer‐
ing wheel, an optical warning is given first. Dis‐
play 1 appears in the multifunction display. If
the driver still does not steer the vehicle, or
gives no confirmation to the system, a warning
tone sounds in addition to the visual warning
message.
The warning is not issued, or is stopped, when
the driver gives confirmation to the system:
The driver steers the vehicle.
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The driver presses a steering wheel button or
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operates Touch Control.
If Active Steering Assist detects that a system
limit has been reached, a visual warning is
issued and a warning tone sounds.
Active Steering Assist is only an aid. The driver is
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good time
and for staying in lane. Before changing lanes,
the driver must make sure that the neighbouring
lane is free (glance over the shoulder).
System limits
Active Steering Assist has a limited steering tor‐
que for lateral guidance. In some cases, the
steering intervention is not sufficient to keep the
vehicle in the lane or to drive through exits.
The system may be impaired or may not function
in the following instances:
There is poor visibility, e.g. due to snow, rain,
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fog, heavy spray, greatly varying light condi‐
tions or strong shadows on the carriageway.
There is glare, e.g. from oncoming traffic,
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direct sunlight or reflections.
Insufficient road illumination.
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The windscreen is dirty, misted up, damaged
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or covered in the vicinity of the camera, e.g.
by a sticker.
No, or several, unclear lane markings are
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present for one lane, or the markings change
quickly, e.g. in a construction area or junc‐
tions.
The lane markings are worn away, dark or
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covered up, e.g. by dirt or snow.
The distance to the vehicle in front is too
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small and the lane markings thus cannot be
detected.
The road is narrow and winding.
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There are obstacles on the lane or projecting
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out into the lane, such as object markers.
The system does not provide assistance in the
following conditions:
On tight bends and when turning.
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When crossing junctions.
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At roundabouts or toll stations.
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When towing a trailer.
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When actively changing lane without switch‐
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ing on the turn signal indicator.
When the tyre pressure is too low.
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Depending on the selected vehicle settings,
Active Steering Assist may be unavailable.
Observe the status display of Active Steering
Assist in the multifunction display
( page 253).
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