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.
This is one of DSTC's permanent functions and cannot be switched off.
See also:
Cleaning the seat belts
Clean only with lukewarm water and a mild
soap solution. ...
Comfort and convenience
While the interior of the Volvo S40 places an emphasis on style, form has not
been allowed to take precedence over function. The fascia ergonomics have been
carefully designed and drivers will fin ...
Working on your vehicle
Note the following before you begin working
on your vehicle: ...
