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2006 VOLVO V70
The following two functions are common to both STC/DSTC
1. 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 car (on the same axle). TC monitors and
compares the rotational speed of the drive wheels. If one of the drive wheels shows a tendency to spin,
the difference in speed is immediately detected. This triggers the Anti-lock Brake System, which brakes
the spinning wheel until the difference in rotational speed is corrected.
TC is most active at low speeds, and a pulsating sound will be audible when the system is regulating
wheel spin. This is quite normal. This is one of the STC/DSTC's permanent functions and is not affected
when the button on the center control panel is pressed.
2. Spin control (SC)
The spin control function is designed to help prevent the drive wheels from spinning while the car is
accelerating. This is done by temporarily reducing engine torque to the drive wheels, which helps
improve stability and tractive force.
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. This is
done by pressing the STC/DSTC button on the center control panel for at least a half a second.
When the SC function has been switched off:
● The text window (see page 30) will briefly display "SPIN CONTROL OFF"
● The LED in the STC/DSTC button will be off.
The following function is only available with DSTC:
3. Active Yaw Control (AYC)
This function helps maintain directional stability, for example when cornering, by braking one or more
of the wheels if the car shows a tendency to skid or slide laterally. This is done by activating the Anti-
lock Braking System. A pulsating sound will be audible when the function is active, which is quite
normal. If you apply the brakes while this function is active, the brake pedal will feel stiffer than usual.
This is also one of the DSTC system's permanent functions and is not affected when the DSTC button on
the center control panel is pressed.
R-models only:
The AYC function can be deactivated. This is done by pressing the DSTC button on the center control
panel (see the illustration on
page 31) for approximately one second. This procedure must be repeated 5
times, after which "DSTC REDUCED FUNCTION" will be displayed in the text window. AYC will be
automatically reactivated the next time the ignition is switched on.
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