SSU 001504.07 – S40 Operator Presence Switch, Signal Invalid

SSU 001504.07 (SSU 1504.07)

Code: 001504.07

Shortcode: 1504.07


This diagnostic trouble code (DTC), SSU 001504.07, is triggered if the seat switch reports “operator on seat” for longer than 25.5 hours without interruption. This indicates an invalid signal from the operator presence switch.


When this error is detected, the equipment may not correctly recognize the operator’s presence, potentially leading to safety and operational issues.


Inspect Operator Presence Switch:

  • Check the operator presence switch (seat switch) for proper operation.
  • Ensure the switch is not stuck or malfunctioning.

Verify Wiring and Connections:

  • Inspect the wiring and connectors related to the operator presence 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 operator presence detection system 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 that the operator presence switch is functioning correctly is crucial for the safe operation of the equipment.

Control Units: John Deere

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