BCU 001504.14 – Operator Presence Switch Not Activated with HMS Plus Selected. John Deere System Advisory.

BCU 001504.14 (BCU 1504.14)

Code: 001504.14

Shortcode: 1504.14


Error code BCU 001504.14 is an operator information alert generated when the HMS Plus (Headland Management System) function is active, but the Basic Control Unit (BCU) does not detect a valid operator presence signal for more than 30 seconds. This alert is intended to notify the operator that the presence detection system, which ensures the operator is in the seat to safely control the vehicle, is not confirming their presence while a critical function is engaged.


The BCU may automatically deactivate the HMS Plus function or restrict certain vehicle operations to ensure safety until the operator presence is confirmed. This safety protocol helps prevent unintended vehicle movements and ensures that the control systems are only active when the operator is properly positioned to manage them.


  • Check Operator Presence Switch: Inspect the seat or operator presence switch for any signs of malfunction, such as stuck buttons, loose connections, or general wear and tear. Make sure the switch is properly activated when the seat is occupied.
  • Test Switch Functionality: Use diagnostic tools or a multimeter to test the electrical functionality of the presence switch. Ensure it is sending a signal to the BCU when the seat is occupied.
  • Inspect Wiring and Connections: Examine all wiring and connections leading to and from the operator presence switch. Look for any breaks, wear, or loose connections that could be interrupting the signal.
  • Replace Faulty Components: If the operator presence switch or any part of its circuitry is found to be faulty, replace these components to ensure reliable detection of the operator’s presence.
  • Reset the BCU and Clear the Code: Once repairs or replacements are made, reset the BCU to clear the diagnostic code and confirm that the system now correctly detects the operator’s presence when HMS Plus is selected.
  • Monitor System Operation: After addressing the issue, monitor the system to ensure that it consistently recognizes operator presence and does not issue further alerts of this nature.


Maintaining the integrity of safety features like the operator presence switch is critical for ensuring the vehicle operates safely and effectively, especially when using advanced functions like HMS Plus. Regular checks and prompt maintenance of these systems are essential to ensure the safety and functionality of the machinery and prevent accidents caused by unexpected vehicle operation.