AIC 521408.02 – Armrest Hitch Controls Module Switch Conflict. John Deere AIC System Alert.

AIC 521408.02 (AIC )

Code: 521408.02



This error code pertains to a conflict within the Armrest Hitch Controls Module, specifically involving the rear hitch return to lower set point switch. The issue is characterized by an error in reading the LIN Bus signal for the button used to select a saved operating depth. This suggests potential disruptions or malfunctions in the signal communication path or the switch itself.


In response to this conflict, the control unit has activated a limited function mode to prevent further complications and ensure safe operation, restricting some functionalities of the hitch controls.


  • Inspect the Hitch Control Switches and Connections: Check for any mechanical damage, improper settings, or obstructions that might interfere with switch operation.
  • Assess LIN Bus Communication Path: Use diagnostic tools to test the integrity and functionality of the LIN Bus communication path, ensuring there are no disruptions affecting signal transmission.
  • Troubleshoot and Repair Electrical Issues: Examine all related wiring and connections for signs of wear, damage, or loose connections that could impact the functionality of the switch and signal accuracy.
  • System Reset and Testing: After rectifying any issues, reset the system and perform comprehensive tests to confirm that all components are communicating effectively and that the hitch control functions are fully operational.


Regular diagnostics and preventive maintenance are crucial for maintaining the functionality and safety of control modules in agricultural machinery. Addressing issues promptly when they arise can help avoid significant downtime and ensure that equipment operates efficiently and safely. Proactive monitoring of system communications and component integrity is essential for sustained performance.