John Deere 2818.31 – RPT, CCU, BCU, or ICC: Operator Presence Switch Not Activated

The Central Control Unit (CCU) has detected a logic conflict where the PTO is commanded on, but the seat switch sensor does not register an operator's presence. This is a critical safety interlock function designed to prevent PTO operation without an operator in the seat. The underlying cause may be mechanical binding of the seat, electrical circuit issues, or a faulty seat switch, which will prevent the PTO from operating correctly and may cause the engine to shut down.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 5045E
• 5055E
• 5065E
• 5075E
• 5085E
• 5090E
• 5100E
• 5065M
• 5075M
• 5085M
• 5095M
• 5100M
• 5105M
• 5115M

1. 1

   Operator Presence Switch Operational Check: Verify if the switch activates when the operator sits down. Listen for an audible click or use a multimeter to check for continuity changes when weight is applied to the seat.

2. 2

   Inspect the Seat Mechanism: Ensure the mechanical components of the seat are working correctly and are not physically preventing the seat cushion from depressing the switch.

3. 3

   Visual Inspection: Check the operator presence switch for visible physical damage, debris buildup, or disconnections.

4. 4

   Wiring and Connections: Inspect the wiring harness and connectors under the seat for signs of damage, corrosion, pinched wires, or loose connections.

5. 5

   CAN Bus / Software Check: If the switch and wiring are intact, use a diagnostic tool to verify CAN bus communication between the Operator Interface Control (OIC) and the RPT module. Ensure the tractor's control software is updated to the latest version.

1. 1

   Power Down

   Turn off the tractor, remove the key, and ensure the PTO switch is in the OFF position.

2. 2

   Access the Switch

   Tilt the seat forward or remove the bottom seat cushion to access the operator presence switch (usually mounted directly under the cushion).

3. 3

   Disconnect

   Unplug the electrical wiring harness connector from the seat switch.

4. 4

   Remove the Switch

   Depending on the switch type, either unbolt the mounting tabs or twist the switch counterclockwise to release it from the seat pan.

5. 5

   Install the New Switch

   Insert the new OEM switch into the mounting hole and twist to lock it (or bolt it down).

6. 6

   Reconnect

   Plug the wiring harness back into the switch, ensuring the connector clicks securely into place.

7. 7

   System Reset and Testing

   Turn the tractor on, sit in the seat, and engage the rear PTO to confirm the code has cleared and the PTO operates safely without shutting down.