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04 Comfort and driving pleasure
127
Collision warning system with brake support*
04
General
The collision warning system (Collision Warn-
ing with Brake Support, CW) is an aid de-
signed to warn the driver who is at risk from
driving into a vehicle in front that is driving in
the same direction.
The brake support reduces the collision
speed.
Maintenance of collision warning system
components must only be performed by an
authorised Volvo workshop
.
Function
Functions overview
Visual warning signal, collision risk
Sensor
The radar sensor detects vehicles in front
that are driving in the same direction as you.
In the event of there being a risk of collision
with such a vehicle your attention is drawn
with a red warning lamp and a warning
sound.
If the risk of collision still increases after the
warning then the brake support is activated.
The brake support prepares the brake sys-
tem for rapid braking and the brakes are ap-
plied gently, which may be noticed as a slight
jerk. If the brake pedal is depressed suffi-
ciently quickly then braking is implemented
with full brake function, even if the force on
the pedal is light. The collision warning sys-
tem is active between 7 km/h and 180 km/h.
Limitations
The visual warning signal may be difficult to
notice in strong sunlight or when sunglasses
are being worn. For this reason always acti-
vate the warning sound during such condi-
tions.
Warnings may not appear if the distance to
the vehicle in front is very small or if steering
wheel and pedal movements are large, e.g. a
very active driving style.
Warnings may be triggered late, be absent or
triggered unnecessarily if the traffic situation
means that the radar sensor cannot accu-
rately detect a vehicle in front. The collision
warning system uses the same radar sensors
as adaptive cruise control. For more informa-
tion on the radar sensor and its limitations,
see page 124.
WARNING
The collision warning system does not work
in all driving situations and traffic, weather
and road conditions. The collision warning
system does not react to slow vehicles, sta-
tionary vehicles or vehicles travelling in an-
other direction to the host vehicle.
Warnings are given at the earliest in the
event of high collision risk. The Function
section and after informs about limitations
that the driver must be aware of before use.
The collision warning system has brake
support that only reduces collision speed if
the driver brakes.
Never wait for a collision warning. When
driving you are responsible for maintaining
the correct distance and speed, even when
the collision warning system is used.
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NOTE
The visual warning signal can be temporari-
ly disengaged in the event of high passen-
ger compartment temperature caused by
strong sunlight for example. If this occurs
then the warning sound is activated even if
it is deactivated in the menu system.