Stability System - Volvo XC90 Owner's Manual

06 Starting and driving

Stability system

Dynamic Stability Traction Control
(DSTC)
The stability system consists of a number of
functions designed help reduce wheel spin,
counteract skidding, and to generally help
improve directional stability.
NOTE
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.
06
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.
Under certain circumstances, such as when
driving with snow chains, or driving in deep
snow or loose sand, it may be advisable to
158
temporarily switch off this function for maxi-
mum tractive force.
Temporarily switching off Spin control
1. Turn the thumbwheel (1) on the left-side
steering wheel lever until the DSTC menu
is displayed.
2. Hold down the RESET button (2) to tog-
DSTC ON DSTC SPIN
gle between or
CONTROL OFF .
NOTE
•
DSTC SPIN CONTROL
The message
OFF
indicates that the stability sys-
tem's spin control function has tempo-
rarily been switched off.
•
The stability control indicator light will
illuminate and remain on until spin
control has been reactivated.
•
The spin control function is automati-
cally 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 stabil-
ity, for example when cornering, by braking
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.
WARNING
The car's handling and stability characte-
ristics will be altered if the DSTC system
functions have been disabled.