Stability System (Option) - Volvo S60 Owner's Manual

Starting and driving
Stability system (option*)
Stability and Traction
Control STC/DSTC*
The STC system (Stability and
Traction Control) includes the SC and TC
functions.
The DSTC system (Dynamic Stability and
Traction Control) functions include TC, SC,
AYC and EBA.
Traction Control (TC)
The Traction Control function transfers power
from the spinning drive wheel to the drive
wheel with traction by braking the spinning
drive wheel. In order to improve forward
traction during similar situations, exert more
pressure on the accelerator pedal than normal.
An audible pulsating sound, which accom-
panies proper Traction Control, is completely
normal for system function. The TC function is
most active at lower speeds and cannot be
switched off.
Stability Control (SC)
The Stability Control function is designed to
prevent the drive wheels from slipping on the
road surface during acceleration by reducing
engine torque output to the drive wheels. This
improves traction and driving safety in slippery
conditions. Certain driving conditions such as
driving with snow chains or driving in deep
snow or sand may require SC deactivation in
order to increase traction. The function can be
deactivated with the STC/DSTC button.
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Active Yaw Control (AYC)
The AYC (Active Yaw Control) function
provides automatic braking for one or more
wheels, which allows for more stability in the
event of a skid. If braking occurs in such a
situation, the brake pedal will feel more rigid
than normal and will be accompanied by an
audible pulsating sound. The AYC function is
continuously active and cannot be switched off
for reasons of safety.
The function can be switched off with the
DSTC button. However, the function deacti-
vation/reactivation procedure requires that the
command be repeated three times (push the
button five times: on-off-on-off-on).
Emergency Brake Assistance (EBA)
The Emergency Brake Assistance function is
integrated in the DSTC system and is designed to
provide immediate maximum brake force
whenever rapid braking is necessary. The system
detects the need for heavier braking by regis-
tering how quickly the brake pedal is applied.
The EBA function is active at all speeds. For –
safety reasons, – it cannot be switched off.
When the EBA function is activated,
the brake pedal sinks while maximum braking
force is applied. Continue braking without
releasing the brake pedal. The EBA function
disengages when the pressure on the brake
pedal is released.
Road Friction Detection (RFD) (option)
Road Friction Detection is an advanced system
which discerns the amount of friction between
the tyres and the road. The system is designed
as an ear ly warning system which alerts the
driver when road conditions are slippery.
The RFD system is active at low speed and
upwards and cannot be switched off for reasons
of safety.
• The RFD system detects low road surface
friction.
• The RFD system has been switched off due to
a fault.
*: The STC and DSTC systems are options in
certain markets.