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04 Driver support
Stability system
Introduction
The Dynamic Stability and Traction Control
system (DSTC) consists of a number of func-
tions designed to help reduce wheel spin,
counteract skidding, and to generally help
improve directional stability.
CAUTION
A pulsating sound will be audible when the
system is actively operating and is normal.
04
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 DSTC's permanent functions
and cannot be switched off.
Active Yaw Control (AYC)
This function helps maintain directional stabil-
ity, for example when cornering, by braking
136
one or more of the wheels if the vehicle
shows a tendency to skid or slide laterally.
This is one of DSTC'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.
Operation
Sport mode
The stability system is always activated and
cannot be switched off.
However, the driver can select Sport mode,
which offers more active driving characteris-
tics. In this mode, the engine management
system monitors movement of the accelerator
pedal and steering wheel for sportier driving
by allowing more lateral movement of the rear
wheels before DSTC is activated.
Under certain circumstances, such as when
driving with snow chains, or driving in deep
snow or loose sand, it may be advisable to
temporarily use Sport mode for maximum
tractive force.
If the driver releases pressure on the acceler-
ator pedal, DSTC will also activate to help
stabilize the vehicle.
To switch to Sport mode:
1. Press the My Car button in the center
console control panel and select
DSTC
in the menu.
2. Unselect the symbol and leave the menu
by pressing EXIT.
> This puts DSTC in Sport mode.
Sport mode remains active until the driver
switches it off in the menu or until the engine
is switched off. DSTC will return to normal
mode when the engine is restarted.
My S80
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