SAS Signal. Unreasonable Signal

SAS signal. Unreasonable signal

Checking the connectors








- Ignition off.
- Check the ABS control unit,the control unit for the steering wheel angle sensor (SAS) and the steering wheel control unit (SWM) connector for contact resistance and oxidation as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Connect the connectors, install the components, etc.
- Ignition on.
- Read off the steering wheel angle.
Check that the steering wheel angle is updated by turning the wheel to full lock in both directions. The steering wheel angle should be 0 when in straight-ahead position and +600° with full LH lock and -600° with full RH lock. If the signal is correct, it is likely that the fault has been caused by contact resistance or oxidation.

Additional information:
- To connect the test box, see Connecting the ABS breakout box Pinout Values and Diagnostic Parameters.
- For disconnection of the steering wheel angle sensor, see Contact reel / steering wheel angle sensor, replacing Contact Reel / Steering Wheel Angle Sensor, Replacing.
- For information on signals in the control unit for the steering wheel angle sensor (SAS), see Signal specification, ABS / DSTC (dynamic stability and traction control) control module Signal Specification.
- For information on signals in the steering wheel control unit (SWM), see Signal specification Signal Specification, Steering Wheel Module (SWM).









Is the steering wheel angle updated?

Yes - Fault Found

No - Checking the wiring and sensor

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Checking the wiring and sensor




- Ignition off.
Check that the control unit for the steering wheel angle sensor (SAS) and the steering wheel angle sensor itself as well as the communication wires between the control unit and the steering wheel angle sensor are not in close proximity to sources of interference such as electric motors, mobile telephones and mobile telephone wires etc.
Check the connectors and sensors for damage.
Do the necessary corrective action.

Additional information:
- To connect the test box, see Connecting the ABS breakout box Pinout Values and Diagnostic Parameters.
- To replace the steering wheel angle sensor, see Contact reel / steering wheel angle sensor, replacing Contact Reel / Steering Wheel Angle Sensor, Replacing.
- For information on signals, see Signal specification, ABS / DSTC (dynamic stability and traction control) control module Signal Specification.









Is there a fault?

Yes - Verification

No - No Fault Found

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Verification




Verification








- Ignition off
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the steering wheel angle.
Turn the steering wheel between both lock positions. Check that the steering wheel angle is updated and reaches a maximum of +600° or -600°.





Was the steering wheel angle OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Trouble-shooting information

PAPER - No Fault Found

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Trouble-shooting information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the connectors

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