Volvo S80 Owner's Manual page 159

04 Comfort and driving pleasure
Adaptive cruise control*
then re-engaged when the accelerator pedal is
released.
Automatic deactivation
Adaptive cruise control is dependent on other
systems e.g. stability and traction control sys-
tem (DSTC). If any of these systems stop work-
ing then cruise control is automatically deacti-
vated.
In the event of automatic deactivation a signal
will sound and the message
04
Cancelled is shown in the display. The driver
must then intervene and adapt the speed to
vehicles in front.
An automatic deactivation can be due to:
•
speed falls below 30 km/h
•
wheels lose traction
•
brake temperature is high
•
engine speed is too low
•
the radar sensor is covered e.g. by wet
snow or heavy rain (radar waves blocked).
The radar sensor and its limitations
Apart from the adaptive cruise control, the
radar sensor is also used by the Collision
Warning with Auto Brake function (see
page 164) and the Distance Alert function (see
page 161). It is designed to detect cars or
larger vehicles driving in the same direction.
*
158
Option/accessory, for more information, see Introduction.
Modification of the radar sensor could result in
it being illegal to use.
WARNING
Accessories or other objects such as auxil-
iary lamps must not be installed in front of
the grille.
The capacity of the radar sensor to detect vehi-
cles in front is reduced significantly:
Cruise control
•
if the radar sensor becomes blocked and
cannot detect other vehicles e.g. in heavy
rain or slush, or if other objects have col-
lected in front of the radar sensor.
NOTE
Keep the surface in front of the radar sensor
clean.
•
if the speed of vehicles in front is signifi-
cantly different from your own speed.
The radar sensor has a limited field of vision. In
some situations it may detect another vehicle
later than expected or not detect any vehicle at
all.
Radar sensor field of vision (grey).
Sometimes the radar sensor cannot detect
vehicles at close quarters, for example a
vehicle that drives in between your car and
vehicles in front.
Small vehicles, such as motorcycles, or
vehicles not driving in the centre of the lane
can remain undetected.