SSU 001504.09 – S40 Operator Presence Switch, Signal Not Received

SSU 001504.09 (SSU 1504.09)

Code: 001504.09

Shortcode: 1504.09


This diagnostic trouble code (DTC), SSU 001504.09, is triggered when the information from the seat switch is not accepted on the CAN BUS after four attempts. This indicates a problem in the vehicle CAN BUS communication with the operator presence switch.


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


Verify CAN BUS Communication:

  • Inspect the CAN BUS wiring and connectors for any signs of damage, loose connections, or corrosion.
  • Use diagnostic tools to check for continuity and proper voltage levels in the CAN BUS lines.

Check Operator Presence Switch:

  • Ensure that the operator presence switch (seat switch) is functioning properly and transmitting signals correctly.

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 CAN BUS 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 CAN BUS wiring and connected components can help prevent communication issues.
  • 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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