SSU 523349.09 – AutoTrac Resume Switch Message Missing

SSU 523349.09 (SSU )

Code: 523349.09



This diagnostic trouble code (DTC), SSU 523349.09, is triggered when the Steering System Control Unit (SSU) detects that the transmission resume switch message is not available on the CAN Bus. This indicates a communication issue with the AutoTrac resume switch.


When this error is detected, the AutoTrac system may not resume correctly, leading to potential issues with vehicle guidance and operation.


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 AutoTrac Resume Switch:

  • Ensure that the AutoTrac resume switch is functioning properly and transmitting signals correctly.
  • Verify that the switch is correctly configured and operating.

Update Software:

  • Ensure that the SSU and related system software are up-to-date. Apply any available firmware updates to improve system performance and communication protocols.

Replace Faulty Components:

  • If the AutoTrac resume 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 network and connected components can help prevent communication issues.
  • Keeping the system firmware up-to-date ensures compatibility and reliability of the vehicle’s communication systems.

Control Units: John Deere

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