Steering Angle Sensor Module (SASM)

Vehicles equipped with EPAS are also equipped with a Steering Angle Sensor Module (SASM). For vehicles without Active Park Assist, the SASM has no internal circuitry and does not contribute in any way to AdvanceTrac® functionality. In this case, the SASM is used to provide structural support for the clockspring and for canceling the turn signals. However, on vehicles that are  equipped with Active Park Assist, the SASM is fully functional. The ABS module receives steering wheel angle information that is transmitted on the HS-CAN bus from the SASM.

The SASM measures the rate of rotation of the steering wheel by monitoring the steering wheel rotation ring as it passes through the sensor gap. The SASM uses the HS-CAN bus to transmit information to the ABS module about whether the steering wheel is being turned left or right and how far it is being turned.