Pinpoint Test Am : C1B00:29, C1B00:41, C1B00:64, C1B00:86: Notes
Diagnostic Overview
C1B00:29, C1B00:41, C1B00:64, C1B00:86
Refer to Vehicle Dynamic Systems for schematic and connector information.
Normal Operation and Fault Conditions
The ABS module uses steering wheel position sensor information in conjunction with RCM sensor information to determine vehicle direction of travel. For vehicles not equipped with active park assist, the ABS module receives the steering wheel position information from the PSCM over the HS-CAN. For vehicles equipped with active park assist, the ABS module receives the steering wheel position information from the SCCM over the HS-CAN.
The ABS module continually compares the steering wheel position information received against other sensor information to determine the validity of the information received. An internal failure of the steering wheel position sensor, RCM, PSCM, SCCM or a HS-CAN concern causes the ABS module to set 1 or more DTCs.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C1B00:29 | Steering Angle Sensor: Signal Invalid | Two seconds after the ignition is set to ON, the ABS module begins to monitor the steering wheel angle sensor information from the SCCM or the PSCM. If the ABS module does not receive the steering wheel angle count message, the ABS module sets a DTC. |
| C1B00:41 | Steering Angle Sensor: General Checksum Failure | When the ignition is set to ON, the ABS module calculates a steering angle sensor checksum and compares this calculation to the actual checksum received from the SCCM or the PSCM. If the calculated checksum and the received checksum do not match twice in the same ignition cycle, the ABS module sets a DTC. |
| C1B00:64 | Steering Angle Sensor: Signal Plausibility Failure | The ABS module compares the steering angle sensor information against other ABS module inputs (wheel speed, RCM information, etc.). If the steering angle information does not match the other inputs, if the steering angle information is outside of a predetermined range or if the steering wheel center position cannot be determined, the ABS module sets a DTC. |
| C1B00:86 | Steering Angle Sensor: Signal Invalid | The ABS module receives the actual steering angle sensor information in degrees from the SCCM or the PSCM. If the ABS module receives "unknown" or "fault" instead of the actual degrees of steering angle, the ABS module sets a DTC. |
Possible Causes
- Vehicle communication bus
- Steering wheel rotation sensor
- SCCM
- PSCM (part of steering gear assembly)
- RCM