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 control module or in the steering wheel module (SWM) connector.

Other information:
- To access the connector for the control module for the steering wheel angle sensor, see Service and Repair
- To access the connector for the steering wheel module (SWM), see Steering wheel module (SWM), replacing Steering Wheel Module (SWM), Replacing
- 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)
- For information about signals, see Pinout Values and Diagnostic Parameters. Pinout Values and Diagnostic Parameters








Is the value OK?

Yes - Troubleshooting procedure complete

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 #9 (#A33) and steering wheel module (SWM) terminal #12 (#A12). Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground 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 access the connector for the steering wheel module (SWM), see Steering wheel module (SWM), replacing Steering Wheel Module (SWM), Replacing
- To connect the breakout box to the steering wheel module (SWM), see Connecting the breakout box Connecting the Breakout Box
- 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 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 the current in the circuit.
Turn the steering wheel to full lock in both directions.
The current should oscillate between 11 and 30 mA.





Is the current OK?

Yes - Troubleshooting procedure complete

No - 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 - Exit Fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the connectors

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