SSU 001504.31 – S40 Operator Presence Switch, Noone on Operator’s Seat While AutoSteer is Running

SSU 001504.31 (SSU 1504.31)

Code: 001504.31

Shortcode: 1504.31


This diagnostic trouble code (DTC), SSU 001504.31, is triggered when the AutoSteer function is activated, and no operator is detected on the seat for longer than 2 seconds. If no operator is recognized on the seat for longer than 7 seconds, the AutoSteer function is switched off. This indicates a safety concern as AutoSteer requires the operator to be present.


When this error is detected, the equipment will disable the AutoSteer function after 7 seconds if no operator is detected on the seat, ensuring safety.


Check Operator Presence Switch:

  • Ensure that the operator presence switch (seat switch) is functioning properly and accurately detecting the presence of the operator.

Verify Seat Switch Connections:

  • Inspect the wiring and connectors related to the seat switch for signs of damage, loose connections, or corrosion.
  • Ensure all connections are secure and free from contaminants.

Update Software:

  • Ensure that the software related to the AutoSteer and operator presence detection systems is up-to-date. Apply any available firmware updates to improve system performance and compatibility.

Replace Faulty Components:

  • If the operator presence switch or related components are found to be defective, replace them with new, genuine parts.

Consult Technical Support:

  • If the error persists after performing the above steps, consult technical support or the manufacturer for further assistance.


  • Regular maintenance and inspection of the operator presence detection system can help prevent invalid signals.
  • Ensuring the operator presence switch is functioning correctly is crucial for the safe operation of AutoSteer.

Control Units: John Deere

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