Signal Too Low

Signal too low. Permanent fault

Checking the connectors




- Ignition on
- Read off the status of steering wheel angle signal R4.
Turn the steering wheel in both directions and check that the value changes between ON and OFF.

Other information:
- To access the connector for the control module for the steering wheel angle sensor, see Steering wheel module (SWM), replacing Service and Repair
- To access the connector for the steering wheel module (SWM), see Steering wheel module (SWM), replacing Service and Repair
- For information about signals, see Signal description, Control unit for the steering wheel angle sensor (SAS) Signal Specification and Signal specification Signal Specification, Steering Wheel Module (SWM).









Does the value change between OFF and ON?

Yes - Fault Found

No - Checking wiring and sensors

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Checking wiring and sensors








- Ignition off
- The control module for the steering wheel angle sensor disconnected
- Steering wheel module (SWM) disconnected
- Connect the breakout box to the control module for the steering wheel angle sensor and to the steering wheel module (SWM)
Check the wiring between the control module for the steering wheel angle sensor terminal #14 (#A38) and steering wheel module (SWM) terminal #18 (#A18). Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try replacing the steering wheel angle sensor if no faults are found in the wiring between the control module for the steering wheel angle sensor and the steering wheel module (SWM).

Other information:
- To connect the breakout box to the control module for the steering wheel angle sensor, see Connecting the breakout box to the steering angle sensor Connecting the Breakout Box, Steering Wheel Angle Sensor Module (SAS)
- To connect the breakout box to the steering wheel module (SWM), see Connecting the breakout box Connecting the Breakout Box, Steering Wheel Module (SWM)
- To replace the steering wheel angle sensor, see Contact reel / steering wheel angle sensor, replacing Contact Reel / Steering Wheel Angle Sensor, Replacing
- For information about signals, see Signal description, Control unit for the steering wheel angle sensor (SAS) Signal Specification and Signal specification Signal Specification, Steering Wheel Module (SWM).










Continue - Verification

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Verification




Verification

Hint: After the repair it is necessary to check that the fault has been rectified.




- Ignition off.
- Connect the connectors, install the components, etc.
- Ignition on.
- Read off steering wheel angle signal R4.
- Turn the steering wheel to full lock in both directions.
The value should change between OFF and ON.





Does the value change?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing 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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