Volvo 2008 V70 Owner's Manual page 159

The driver must apply the brakes for full braking effect.
NOTE
The auto-brake function is always on and cannot be turned off.
Operation
Settings are made from the center console via a menu system. See
On and off
To switch Collision Warning on or off, go into the menu
Off. When the engine is started, the setting that was selected when it was switched off will be used.
Activating/deactivating warning signals
The collision warning system's audible and visual signals are activated automatically when the engine is started if the
collision warning system is activated.
The audible warning signal can be activated/deactivated by selecting the alternative
Collision warning settings
Setting a warning distance
This setting determines the distance at which the visual and audible warnings are triggered. Select Long, Normal, or
Short under Car settings
The warning distance determines the level of sensitivity used by the system. The warning distance
earlier warning. Begin by using
WARNING
The setting Short should only be used in situations where traffic is light and moving at low speeds.
Collision Warning alerts the driver to the risk of a collision but this function cannot reduce the driver's reaction
time.
For Collision Warning to be as effective as possible, it is recommended that Distance Alert be set to 4 or 5, see
page 165.
NOTE
When Adaptive Cruise Control (ACC) is used, the warning light and signal will be used by ACC, even if Collision
Warning has been switched off.
In situations where traffic is moving at considerably different speeds, or if the vehicle ahead brakes suddenly,
warnings may be considered to be late, even if the setting
Checking settings
The current Collision Warning settings can be checked by going into the menu system at
170
04 Comfort and driving pleasure
Collision Warning with Auto-brake (option)
Car settings Collision warning
Warning sound.
Collision warning settings
Long and if the system gives too many warnings, try changing to Normal.
settings. See page 124
page 124 for information on using the menu system.
Car settings Collision warning settings
Warning distance.
Long has been selected.
for more information on the menu system.
and select
On or Off in Car settings
Long provides an
On or