In brief
ZF's Steering Angle Sensor mounts in the steering column and supplies steering-wheel-angle data to stability control. This is input information for subsequent control.
Useful to know
ZF's Steering Angle Sensor mounts in the steering column and supplies steering-wheel-angle data to stability control. This is input information for subsequent control. [1]
Do not confuse a sensor with an actuator that turns the wheels. Separate measurement, processing and intervention; an incorrect input signal differs from a failed braking or steering actuator.
Sources
For further detail and to check the information: