ATC 523848.04 – Adjusting Motor for Air Distribution (Potentiometer) Voltage Too Low. John Deere System Advisory.

ATC 523848.04 (ATC )

Code: 523848.04



The error code, ATC 523848.04, is triggered when the control unit measures 0 volts at the signal input for the potentiometer, which is associated with the adjusting motor (B132) for air distribution (lead 2017). This lack of voltage typically indicates a short to ground in the circuit, potentially preventing the adjusting motor from correctly positioning the air distribution flaps.


The absence of voltage can result in the air distribution flaps failing to adjust, which may lead to inefficient air flow and climate control within the cabin. This can affect comfort levels and the overall effectiveness of the HVAC system.


  • Inspect Wiring and Connections: Check the wiring and connections at lead 2017 for signs of damage, wear, or grounding issues that could create a short.
  • Measure and Diagnose the Circuit: Use a multimeter to test for continuity and to locate where the short to ground is occurring within the circuit.
  • Repair or Replace Faulty Wiring or Components: Once the source of the short is identified, repair the damaged wires or replace faulty components to restore proper electrical integrity to the circuit.
  • Test Air Distribution Motor Functionality: After repairs are made, test the adjusting motor to ensure it functions correctly and can accurately control the position of the air distribution flaps.
  • Reset System and Perform Functional Testing: Clear any fault codes from the system and conduct a full operational test to ensure that all components function correctly and that the issue has been fully resolved.


Maintaining the electrical integrity of components within the HVAC system is crucial for ensuring consistent and reliable operation. Regular checks and timely repairs of electrical issues are critical to avoid operational disruptions and maintain cabin comfort. Addressing electrical faults in air distribution controls promptly helps maintain the effectiveness of the climate control system and ensures the comfort and safety of vehicle occupants.