John Deere 1504.08 – OIC / CAB / CCU: Operator Presence Switch Active Too Long, Time-out / Seat Switch Circuit Fault

The seat switch (operator presence switch) has been continuously closed for an unusually long period (exceeding 25.6 hours), indicating the switch is either stuck closed, bypassed, or a heavy object has been left on the seat.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8345R
• 8400R
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 5050E
• 5058E
• 5067E
• 5075E
• 3520
• CH570
• CH670

1. 1

   Verify that no heavy objects (tools, bags, coolers) have been left on the operator seat overnight or for extended periods.

2. 2

   Turn the ignition off and then back on to reset the timer and clear the timeout error.

3. 3

   Visually check the seat switch and its wiring harness for physical damage, wear, or pinched wires that could cause a short to ground.

4. 4

   Verify if the control software is updated to the latest version to improve handling of switch signals.

1. 1

   Clear the Seat

   Remove any items from the seat cushion.

2. 2

   Cycle Power

   Turn the machine's ignition key to the OFF position, wait 30 seconds, and turn it back to the ON position to see if the code clears.

3. 3

   Test the Switch

   If the code remains active, disconnect the operator presence switch harness under the seat. Use a digital multimeter to test the switch for continuity. Unoccupied seat should be OPEN (no continuity); Occupied seat should be CLOSED (continuity).

4. 4

   Inspect the Harness

   If the switch tests fine, check the machine-side wiring harness for a short circuit. A wire rubbed bare against the seat suspension frame can cause the circuit to ground out.

5. 5

   Replace the Switch

   If the switch reads CLOSED while the seat is empty, the internal spring/contacts have failed. Replace the operator presence switch.