AIC 520257.02 – Auto-Mode Switch Fault. John Deere AIC System Alert.

AIC 520257.02 (AIC )

Code: 520257.02



This diagnostic trouble code, AIC 520257.02, is triggered when incorrect logic is detected at the Auto Mode switch. This condition typically suggests a malfunction in the switch itself or in the associated circuit, possibly due to a faulty component, incorrect wiring, or wear and tear. Such issues can disrupt the normal functioning of systems that rely on precise switch operations to toggle auto-mode features in machinery.


To prevent erroneous operations and potential system failures, the control software has limited or completely disabled the function of the Auto Mode switch.


  • Thoroughly inspect the Auto Mode switch and its circuit for signs of damage or wear that might affect its functionality. Look for loose connections, frayed wires, or physical damage to the switch.
  • Test the switch with diagnostic tools to verify its operational integrity and to confirm that it accurately reflects the intended user commands.
  • Replace the switch or repair any damaged components within the circuit. Ensure all connections are secure and meet manufacturer specifications.
  • After making necessary repairs or replacements, recalibrate the system settings associated with the Auto Mode switch to ensure they are correct.
  • Conduct a comprehensive functionality test to confirm that the Auto Mode switch is fully operational and no longer exhibits incorrect logic or restricted function.


Ensuring the reliability and accuracy of operational switches like the Auto Mode is crucial for the automated features of machinery to function effectively. Routine inspections and prompt repairs of these components help maintain the equipment’s performance and safety standards.