Steering Angle Sensor
WARNING: This page is about a different car, the 1994 Acura Legend. However, it is still accessible from the selected car via links, so may be relevant.
Steering wheel sensor is located in steering column. As the steering wheel is turned, 2 electro-magnetic resistors detect rotation and turning direction of magnets mounted on steering wheel. TCS uses signals generated by resistors to detect steering wheel angle and direction of turn.