AIC 523775.02 – Hand Presence Switch Circuit Fault in Multi-Function Lever. John Deere System Notification.

AIC 523775.02 (AIC )

Code: 523775.02



This error code AIC 523775.02 is triggered by a fault in the hand presence switch circuit located within the multi-function lever. The issue is characterized by conflicting outputs from the switch, indicating a potential malfunction such as a short circuit, faulty wiring, or an internal switch failure. This switch is crucial for detecting the operator’s hand presence to enable active control of the machinery functions.


Due to the unreliable signals from the hand presence switch, the control unit has disabled the function associated with the multi-function lever to prevent accidental operation or other safety hazards that might occur from incorrect switch readings.


  • Inspect the Multi-Function Lever and Hand Presence Switch: Examine the lever and the switch for any signs of physical damage, wear, or improper assembly that could contribute to the conflicting signals.
  • Test Electrical Connections and Switch Integrity: Utilize diagnostic tools to test the electrical pathways and functionality of the hand presence switch. Check for shorts, opens, or irregular resistance that could affect the switch’s operation.
  • Repair or Replace Faulty Components: If the hand presence switch or associated circuitry is found to be defective, undertake necessary repairs or replace the faulty parts to ensure correct function.
  • Calibrate the Switch: After repairs or replacement, recalibrate the switch settings to ensure it accurately detects the presence of an operator’s hand.
  • System Reset and Functional Testing: Reset the system to clear any fault states and perform a series of functional tests to confirm that the multi-function lever and its hand presence switch are fully operational and no longer produce conflicting outputs.


Maintaining the integrity of safety features such as the hand presence switch is vital for the safe operation of machinery. Regular checks and prompt attention to any issues are essential to ensure that all safety mechanisms are functioning correctly, thereby protecting both the operator and the equipment.