Normal Operation

The Steering Angle Sensor Module (SASM) monitors the steering wheel position when the slotted-wheel in the sensor passes through the optical field of the sensor.

Fused ignition voltage is supplied to the SASM  from Smart Junction Box (SJB) fuse 34 (5A) along circuit CBP34 (VT/BN). Ground for the sensor is provided along circuit GD115 (BK/GY). The steering wheel angle (in degrees) is sent to the ABS module along the High Speed Controller Area Network (HS-CAN) bus, circuits VDB04 (WH/BU) and VDB05 (WH).

• DTC C1278 (Steering Wheel Angle 1 and 2 Circuit Faulted) - If during normal operation or the ABS module on-demand self test, the ABS module does not receive the steering wheel rotation sensor input or if the input received does not agree with the input from other sensors, DTC C1278 will be set. Also, a loss of sensor power or ground will cause DTC C1278 to set.
• DTC C1963 (Stability Control Inhibit Warning) - Once every key-cycle the ABS module will determine the straight-ahead or center position of the steering wheel by monitoring the steering wheel rotation sensor while the vehicle is being driven. If the vehicle reaches a speed of 75 km/h (47 mph) without finding the center position or if 30 seconds has passed since the initial drive-off without finding the center position, DTC C1963 will set.

  This pinpoint test is intended to diagnose the following: 

• Fuse(s)
• Wiring, terminals or connectors
• SASM