AIC 520871.02 – Control Software Internal Fault. John Deere AIC System Alert.

AIC 520871.02 (AIC )

Code: 520871.02



This error code, AIC 520871.02, indicates a fault within the internal module (EEPROM) of the Armrest Interface Control Unit (AIC), specifically during the process of reading data. This type of error typically suggests issues such as data corruption, EEPROM wear, or electronic failure, which prevent the control software from accessing vital configuration and operation data stored within the EEPROM.


Due to the critical nature of the data involved and the risk of erratic behavior or incorrect operation, the control software has restricted or completely disabled its functions to safeguard the system and prevent further complications.


  • Conduct a comprehensive diagnostic to confirm the nature and extent of the EEPROM issue. Utilize specialized tools to test the integrity and accessibility of the data within the EEPROM.
  • Inspect the hardware connections to the EEPROM for any signs of damage, loose connections, or wear that could affect data transmission.
  • If possible, attempt to reprogram or reinitialize the EEPROM to correct any faults or corrupted data. Ensure that all necessary backups of critical data are made prior to attempting repairs or reprogramming.
  • Should reprogramming not resolve the issue, consider replacing the EEPROM or the control unit entirely, depending on the severity of the fault and the design of the system.
  • After addressing the fault, recalibrate the system settings and conduct thorough testing to ensure that all functions of the control software are fully operational and stable.


Regular monitoring of the control software and its associated hardware components, such as EEPROM, is essential for maintaining the functionality and reliability of advanced machinery. Timely identification and correction of issues related to data storage and access are crucial for avoiding operational delays and ensuring the equipment performs as expected.