Mercedes-Benz GLS Operator's Manual page 216

Driving systems
214
At a distance of approximately 1.6 ft (0.5 m) ;
from the vehicle, Active Blind Spot Assist mon-
itors the area up to 10 ft (3 m) next to = and
behind : your vehicle, as shown in the picture.
In particular, the detection of obstacles can be
impaired if:
there is dirt on the sensors or anything else
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covering the sensors
poor visibility, e.g. due to rain, snow or spray
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Vehicles in the monitoring range are then not
reliably indicated.
Active Blind Spot Assist may not detect narrow
vehicles, such as motorcycles or bicycles, or
may only detect them too late.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may be
indicated, especially if the vehicles are not driv-
ing in the middle of their lane. This may be the
case if there are vehicles at the inner edge of
your lane.
On very wide lanes, vehicles in the adjacent lane
may not be shown if they are too far away.
Due to the nature of the system:
warnings may be issued in error when driving
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close to crash barriers or similar solid lane
borders.
warnings may be interrupted when driving
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alongside particularly long vehicles, e.g.
trucks, for a prolonged time.
Warning lamp
: Warning lamp
Active Blind Spot Assist is not operational at
speeds below approximately 20 mph (30 km/h).
Vehicles in the monitoring range are then not
indicated.
If Active Blind Spot Assist is activated, warning
lamp : in the exterior mirrors lights up yellow
at speeds of up to 20 mph (30 km/h). At speeds
above 20 mph (30 km/h), the warning lamp
goes out and Active Blind Spot Assist is opera-
tional.
If a vehicle is detected within the monitoring
range at speeds above approximately 20 mph
(30 km/h), warning lamp : on the correspond-
ing side lights up red. This warning lamp always
lights up when a vehicle enters the blind spot
monitoring range from behind or from the side.
When you overtake a vehicle, the warning only
occurs if the difference in speed is less than
7 mph (12 km/h).
If you select the reverse gear, Active Blind Spot
Assist is not operational.
The brightness of the warning lamps is auto-
matically adapted to the brightness of the sur-
roundings.
Visual and acoustic collision warning
If you switch on the turn signals to change lanes
and a vehicle is detected in the side monitoring
range, you receive a visual and acoustic collision
warning. You then hear a double warning tone
and red warning lamp : flashes. If the turn sig-
nal remains on, detected vehicles are indicated
by the flashing of red warning lamp :. There are
no further warning tones.