Test E: DTC C1278 - Steering Wheel Angle 1 and 2 Circuit Faulted

Pinpoint Test E: DTC C1278 - Steering Wheel Angle 1 and 2 Circuit Faulted
Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation
The steering wheel rotation sensor (also known as the steering angle sensor module) 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 steering wheel rotation sensor 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 rotation (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.

This pinpoint test is intended to diagnose the following:
^ Fuse(s)
^ Wiring, terminals or connectors
^ Steering wheel rotation sensor

E1-E4:

E4 (Continued)-E6:

E6 (Continued)-E7:

E8: