Signal Too Low

Signal too low

Checking the connectors




- Ignition off
- Check the control module for the steering wheel angle sensor and the steering wheel module (SWM) connectors. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the current.
Turn the steering wheel to the limit position in both directions. The current should be between 11 and 30 mA.
If the current is OK, the cause of the fault was contact resistance or oxidation in the connectors for the control module for the steering wheel angle sensor or in the steering wheel module (SWM).

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
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Steering Wheel Module (SWM)
- To disconnect 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.





Is the value OK?

Yes - Fault Found

No - Checking wiring and sensors

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Checking wiring and sensors








- Ignition off
- 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 #8 (#A32) and steering wheel module (SWM) terminal #7 (#A7). Check for an open-circuit. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground. See 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 and the steering wheel angle sensor.

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
- 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 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.










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 the current in the circuit.
Turn the steering wheel to end stop in both directions.
The current should oscillate between 11 and 30 mA.





Is the current OK?

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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