System Overview

CONTROL MODULE
Only cars equipped with DSTC (dynamic stability and traction control) have a steering wheel angle sensor module (SAS). The easiest way to determine if a car is equipped with DSTC (Dynamic stability and traction control) is to search for a switch, marked DSTC, positioned in the panel on the climate control module (CCM).

The steering wheel angle sensor module (SAS) is integrated in the steering wheel module (SWM). The only function of the steering angle sensor module (SAS) is to process the signals from the steering wheel angle sensor. The signals used by the DSTC system. The steering wheel angle sensor is installed on the steering wheel module (SWM). The sensor is directly connected to the steering wheel angle sensor module (SAS). The steering wheel angle sensor module (SAS) transmits signal information, via the high speed side of the controller area network (CAN), to the brake control module (BCM) and suspension module (SUM).

If a fault occurs, the steering wheel angle sensor module (SAS) detects this and a diagnostic trouble code (DTC) is stored. The DSTC function is switched off.

Diagnostic trouble codes (DTCs) stored in the steering wheel angle sensor module (SAS). This information can be read off using VIDA via the data link connector (DLC) in the vehicle.

SIGNALS
The table below summarizes input and output signals to and from the steering wheel angle sensor module (SAS). The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication.

Input signals
Directly connected:
The steering wheel angle sensor (7/91). Provides the steering wheel angle sensor module (SAS) with relevant information about the steering wheel angle from the straight ahead position, the speed of the steering wheel movements and about which direction the steering wheel is turned.

Output signals
Via Controller Area Network (CAN) communication:
Brake control module (BCM) (4/16). The steering wheel angle sensor module (SAS) provides the brake control module (BCM) with information about the steering wheel angle from the straight ahead position, the speed of the steering wheel movements and about which direction the steering wheel is turned.
Suspension module (SUM) (4/84). The steering wheel angle sensor module (SAS) provides the suspension module (SUM) with information about the position of the steering wheel and the speed at which it is turned.