Volvo 2008 C30 Owner's Manual page 135

The stability system consists of a number of functions designed help reduce wheel spin, counteract skidding, and to
generally help improve directional stability.
A pulsating sound will be audible when the system is actively operating and is normal.
Traction control - TC
This function is designed to help reduce wheel spin by transferring power from a drive wheel that begins to lose
traction to the wheel on the opposite side of the vehicle (on the same axle).
TC is most active at low speeds.
This is one of the stability system's permanent functions and cannot be switched off.
Spin control (SC)
The spin control function is designed to help prevent the drive wheels from spinning while the vehicle is accelerating.
Under certain circumstances, such as when driving with snow chains, or driving in deep snow or loose sand, it may be
advisable to temporarily switch off this function for maximum tractive force.
Temporarily switching off Spin control
1. Turn the thumbwheel (A) on the left-side steering wheel lever until the DSTC menu is displayed.
2. Hold down the RESET button (B) to toggle between
NOTE
The message DSTC SPIN CONTROL OFF
temporarily been switched off.
The stability control indicator light
The spin control function is automatically enabled each time the engine is started.
DSTC ON indicates that all system functions are active.
Active yaw control - AYC
This function helps maintain directional stability, for example when cornering, by braking one or more of the wheels if
the vehicle shows a tendency to skid or slide laterally.
A - thumbwheel
B - RESET button
DSTC SPIN CONTROL ON
indicates that the stability system's spin control function has
will illuminate and remain on until spin control has been reactivated.
or OFF.