•  The steering angle sensor detects the steering angle and sends it to the body control module (BCM) as a steering angle (absolute steering angle) signal.

•  The steering angle sensor is installed to the clock spring.

•  Consists of a sensor unit in which a photo transistor and LED are positioned opposite each other, and a slit disc which moves together with the steering wheel.

1.  As the disc moves with the steering wheel operation, the LED light received by the photo transistor varies due to the slits on the disc.

2.  The photo transistor reads the variation of the light and outputs the steering angle (absolute steering angle) signal to the body control module (BCM).