RLC 521559.03 – Right Side-Facing Worklight on Rear of Roof, Voltage Too High

RLC 521559.03 (RLC )

Code: 521559.03



This diagnostic trouble code is generated if a voltage higher than the expected value is registered at the output to the right side-facing worklight on the rear of the roof. This indicates that the circuit is open or shorted to 12 volts.


When this error is detected, the control software may experience limited or no functionality of the worklight.


  • Inspect Worklight Circuit:
    • Check the wiring and connectors associated with the right side-facing worklight for signs of open circuits or shorts to 12 volts. Look for damaged insulation or exposed wires. Repair or replace any compromised wiring.
  • Verify Voltage Regulation:
    • Ensure the voltage regulator is functioning correctly and maintaining proper voltage levels. Replace the regulator if it is faulty.
  • Test Worklight:
    • Test the right side-facing worklight to ensure it is not damaged or causing the voltage increase. Replace any faulty light components.
  • Check Power Supply:
    • Ensure the power supply to the worklight is stable and within the specified range. Inspect for any issues that could cause an overvoltage condition.


Excessive voltage can damage the worklight and associated circuitry. Regular inspection and maintenance of the electrical system are essential to prevent such issues.

Control Units: John Deere

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