Steering Wheel Angle Sensor Module (SAS) (2005-2014): Function
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2014 Volvo XC90, 2013 Volvo XC90, 2012 Volvo XC90, 2011 Volvo XC90, and 2010 Volvo XC90. However, it is still accessible from the selected car via links, so may be relevant.
See the section about the Active Yaw Control (AYC) in BRAKE CONTROL SYSTEM - DESIGN AND FUNCTION