John Deere 1504.08 – OIC / CAB / CCU: Operator Presence Switch Active Too Long, Time-out / Seat Switch Circuit Fault
Issue description
The control unit has detected a continuous signal from the driver seat presence switch for an extended period without cycling. This indicates that the switch has remained on unusually long, which can be due to a malfunctioning switch, a problem in the electrical circuit, or a deliberate bypass of the safety feature (e.g., by shorting the wires).
Applies to these machines
35 machines- 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
Check the cause
Verify that no heavy objects (tools, bags, coolers) have been left on the operator seat overnight or for extended periods.
Turn the ignition off and then back on to reset the timer and clear the timeout error.
Visually check the seat switch and its wiring harness for physical damage, wear, or pinched wires that could cause a short to ground.
Verify if the control software is updated to the latest version to improve handling of switch signals.
Repair steps
Clear the Seat
Remove any items from the seat cushion.
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.
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).
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.
Replace the Switch
If the switch reads CLOSED while the seat is empty, the internal spring/contacts have failed. Replace the operator presence switch.
Parts you might need
(9)- Seat Operator Presence SwitchRE263085
Primary switch used in the OIC/CAB modules for large ag equipment, including 6R, 7R, 8R, and 9R series tractors.
Alternative for smaller equipment/different seat models.
Alternative for smaller equipment/different seat models.
Alternative for smaller equipment/different seat models.
- Operator Presence SwitchAET10449
Common switch for compact tractors, ZTrak mowers, and 5E series. Supersedes LVA12496 and LVA23755.
- Operator Presence Safety SwitchAM131968
Fits various M-series mowers and 1, 3, and 4 series compact tractors.
Operator Presence Seat Switch
AM135933Seat switch for various models.
- Operator Presence Control SwitchTCA15398
Control switch for X and Z series mowers.
- Operator Presence Switch KitAT365412
Switch kit.
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