Volvo S80 Owner's Manual page 113

When the stability system is in action, it may
seem like the car does not respond normally to
acceleration. This is because the system detects
the amount of friction on the road surface and
allows the different stability system functions to
operate.
The car is equipped with either STC (Stability
and Traction Control) or DSTC (Dynamic
Stability and Traction Control).
Function/system STC
TC X
SC X
AYC
* Option on certain markets
112
Traction Control (TC)
The Traction Control function transfers power
from the spinning drive wheel to the drive wheel
which has grip by braking the spinning drive
wheel. To increase forward traction in this
situation, it may be necessary to depress the
accelerator more than usual. A pulsing sound is
heard when Traction Control is working. This is
completely normal. The TC function is most
active at low speeds.
DSTC*
Spin Control (SC)
The Stability Control function prevents the drive
X
wheels from slipping during acceleration.
X
This improves road safety on slippery surfaces.
X
Under certain conditions, such as when driving
with snow chains or in deep snow or sand, it
may be beneficial to deactivate the SC function
to increase traction. This is done with the
STC/DSTC button.
The driving characteristics of the car may
change if the STC or DSTC is reduced. Al-
ways follow normal safety precautions for
cornering and driving on slippery surfaces.
Active Yaw Control (AYC)
The Active Yaw Control function automatically
brakes one or more wheels to stabilise the car in
the event of a skid. If the brake pedal were to be
depressed in this situation, it would feel more
rigid than usual and a pulsing sound would be
heard.
The AYC function is always active and cannot
be deactivated.