BCU 523690.02 – Fault in S23/S68 Remote Control Switches for Rockshaft (Right/Left). John Deere System Advisory.

BCU 523690.02 (BCU )

Code: 523690.02



This error code, BCU 523690.02, is activated when the Body Control Unit (BCU) identifies an unrealistic value from the S23/S68 switches, which are used for remote control of the rockshaft on the right and left sides. This condition suggests a potential fault in the switch mechanism or in the signal processing within the BCU.


The system may ignore inputs from the affected switches, leading to a loss of remote control functionality for the rockshaft adjustments. This preventive measure avoids unintended rockshaft movements due to erroneous switch inputs.


  • Inspect Switches and Wiring: Begin with a physical inspection of the S23/S68 switches and associated wiring. Look for signs of damage, wear, or improper connections that might be causing the unrealistic values reported by the BCU.
  • Check Electrical Continuity: Use a multimeter to check the electrical continuity and resistance levels in the switch circuitry. Discrepancies from standard values indicate wiring or switch issues that need rectification.
  • Replace Faulty Components: If a fault is identified in the switches or wiring, replace the damaged or malfunctioning components to restore proper functionality.
  • Calibrate Rockshaft Control: After repairs, recalibrate the rockshaft control system to ensure it responds accurately to the switch inputs.
  • Test System Operation: Conduct tests to verify that the switches and rockshaft control are fully operational and that the BCU no longer detects unrealistic values.


Regular checks and maintenance of the switch mechanisms and their electronic interfaces are essential to ensure reliable operation of the rockshaft controls. Promptly addressing error codes like BCU 523690.02 minimizes downtime and maintains the efficiency of agricultural operations.