Faulty Signal
Faulty signal
Checking the signal
Hint: The control module for the steering wheel angle sensor has been unable to determine whether the fault is active or not. Therefore a test routine will be run.
- Ignition on
- Turn the steering wheel to the limit position in both directions twice
- Activate the test routine.
Select an alternative below:
1. The fault is active
2. Analysis complete
3. Non-active fault.
1 - Short-circuit between the signal cables
2 - Short-circuit between the signal cables
3 - Checking wiring and terminals
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Short-circuit between the signal cables
- Ignition off
- Check the connectors for the control module for the steering wheel angle sensor and the steering wheel module (SWM). Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
- Ignition on
- Read off the status of steering wheel angle signals R1/R2/R3/R4
- Carefully turn the steering wheel to the limit positions in both directions and check that the value changes between ON and OFF.
If the value changes between OFF and ON, the cause of the fault was contact resistance or oxidation in the control module or in the steering wheel angle sensor connector.
Other information:
- To disconnect 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 disconnect the steering wheel module (SWM), see Steering wheel module (SWM), replacing Service and Repair
- For information about signals for the control module for the steering wheel angle sensor, see Signal description, Control unit for the steering wheel angle sensor (SAS) Signal Specification
- For information about signals to the steering wheel module (SWM), see Signal specification Signal Specification, Steering Wheel Module (SWM).
Do the signals 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 #5 (terminal (#A29) and steering wheel module (SWM) terminal #4 (terminal #A4)
terminal #12 (terminal (#A36) and steering wheel module (SWM) terminal #13 (terminal #A3)
terminal #13 (terminal (#A37) and steering wheel module (SWM) terminal #11 (terminal #A11)
terminal #14 (terminal (#A38) and steering wheel module (SWM) terminal #18 (terminal #A18)
check for a short-circuit to each other or 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. Check for a short-circuit to supply voltage 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 for the control module for the steering wheel angle sensor, see Signal description, Control unit for the steering wheel angle sensor (SAS) Signal Specification
- For information about signals to the steering wheel module (SWM), see Signal specification Signal Specification, Steering Wheel Module (SWM).
Continue - Verification
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Checking wiring and terminals
Check the wiring between the control module for the steering wheel angle sensor
terminal #5 (terminal (#A29) and steering wheel module (SWM) terminal #4 (terminal #A4)
terminal #12 (terminal (#A36) and steering wheel module (SWM) terminal #13 (terminal #A3)
terminal #13 (terminal (#A37) and steering wheel module (SWM) (terminal #A11)
terminal #14 (terminal (#A38) and steering wheel module (SWM) terminal #18 (terminal #A18)
check for an intermittent short-circuit to each other.
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 for the control module for the steering wheel angle sensor, see Signal description, Control unit for the steering wheel angle sensor (SAS) Signal Specification
- For information about signals to the steering wheel module (SWM), see Signal specification Signal Specification, Steering Wheel Module (SWM).
Continue - Fault-tracing information
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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 R1/R2/R3/R4.
- Turn the steering wheel slowly to full lock in both directions.
The value should change between OFF and ON.
Do the values alternate between OFF and ON?
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 signal
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - Fault Found
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Attempt New Test - Checking the signal
FAULT FOUND - Fault Found
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