Volvo V70 Owner's Manual page 181

Collision Warning with Auto Brake is tempo-
rarily deactivated with reverse gear engaged.
Collision Warning with Auto Brake is not acti-
vated at low speeds - under 4 km/h, which is
why the system does not intervene in situations
where the car is approaching a vehicle in front
very slowly, e.g. when parking.
In situations where the driver demonstrates
active, aware driving behaviour, a collision
warning may be postponed slightly in order to
keep unnecessary warnings to a minimum.
When Auto Brake has prevented a collision
with a stationary object the car remains sta-
tionary for a maximum of 1.5 seconds. If the car
is braked for a vehicle in front that is moving,
then speed is reduced to the same speed as
that maintained by the vehicle in front.
On a car with manual gearbox the engine stops
when Auto Brake has stopped the car, unless
the driver manages to depress the clutch pedal
beforehand.
Camera sensor limitations
The car's camera sensor is also used - as well
as by Collision Warning with Auto Brake - by
the functions:
•
Automatic main/dipped beam dimming -
see page 88
•
Road sign information - see page 152
Collision Warning with Auto Brake & Pedestrian Protection*
•
Driver Alert Control – see page 183
•
Lane Departure Warning – see page 186.
NOTE
Keep the windscreen surface in front of the
camera sensor clean from ice, snow, mist
and dirt.
Do not attach or fit anything to the wind-
screen in front of the camera sensor, as this
could reduce or prevent the function of one
or more camera-dependent systems.
The camera sensors have limitations similar to
the human eye, i.e. they "see" worse in dark-
ness, heavy snowfall or rain and in thick fog for
example. Under such conditions the functions
of camera-dependent systems could be sig-
nificantly reduced or temporarily disengaged.
Strong oncoming light, reflections in the car-
riageway, snow or ice on the road surface, dirty
road surfaces or unclear lane markings could
also significantly reduce camera sensor func-
tion when it is used to scan the carriageway
and detect pedestrians and other vehicles.
The field of vision of the camera sensor is lim-
ited, which is why pedestrians and vehicles
cannot be detected in some situations, or they
are detected later than anticipated.
During very high temperatures the camera is
temporarily switched off for about 15 minutes
04 Driver support
after the engine is started in order to protect
camera functionality.
Fault tracing and action
If the display shows the message
Sensors blocked
then this means that the
camera sensor is blocked and cannot detect
pedestrians, vehicles or road markings in front
of the car.
At the same time, this means that - besides
Collision Warning with Auto Brake - the Auto-
matic main/dipped beam dimming, Road sign
information, Driver Alert Control and Lane
Departure Warning functions will not have full
functionality either.
The following table presents possible causes
for a message being shown along with the
appropriate action.
*
Option/accessory, for more information, see Introduction.
Windscreen
04
179