Stability System - Volvo S40 Owner's Manual

Stability system

When the system is in action, it may seem like
the car does not respond normally to acceler-
ation. 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 either equipped with the stability
and traction control system (STC) – or the
dynamic stability and traction control system
(DSTC).
Function/
STC
system
TC X
SC X
AYC
1. Option on certain markets.
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. It
cannot be deactivated.
Spin Control – (SC)
The Stability Control function prevents the
drive wheels from slipping during acceler-
ation. This improves road safety on slippery
surfaces. 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.
Active Yaw Control – (AYC)
The Active Yaw Control function automati-
1
DSTC
cally brakes one or more wheels to stabilise
X
the car in the event of a skid. If the brake
X
pedal were to be depressed in this situation,
X it would feel more rigid than usual and a
pulsing sound would be heard.
The AYC function is always active and cannot
be deactivated.
Starting and driving
STC/DSTC button
The STC/DSTC button in the centre console
is used to suppress or reactivate the system.
When the LED in the button is lit, the system
is active. The LED in the button goes out
when the stability system has been
suppressed. Other functions are not
affected.
NOTE! To suppress the STC or DSTC
function, the button must be pressed and
held for at least half a second. The LED in the
button goes out and STC/DSTC SPIN
CONTROL OFF appears on the information
display. The system is automatically activated
every time the engine is started.
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