Fendt A.1.C3 – A004 Control Console ECU: A004 - Control console — Floating position key faulty

The system has detected a key fault (such as a short circuit, open circuit, or a permanently stuck button) on the floating position switch located on the control console/joystick. The floating position for the spool valves/front power lift cannot be engaged.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Farmer 400
• Fendt 700 Vario (COM III)
• Favorit 700
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)
• Favorit 900

1. 1

   Inspect the floating position button on the multifunction joystick or crossgate lever for physical damage, debris, or a sticky mechanism.

2. 2

   Verify the voltage supply to the CAN bus on fuse board A013, specifically checking fuses F040 and F041.

3. 3

   Connect the FENDIAS diagnostic tool to read the live status of the A004 control console switches and verify if the floating position key is permanently closed or unresponsive.

4. 4

   Inspect the wiring harness and connectors leading to the A004 control console on the right mudguard for chafing, corrosion, or loose pins.

1. 1

   Preparation

   Park the tractor on a level surface, lower all hydraulic implements to the ground, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Access the A004 Console

   Remove the interior trim panel on the right-hand mudguard inside the cab to access the A004 Control Console and its wiring harness.

3. 3

   Clean or free the switch

   If the diagnostic check revealed a stuck button, attempt to clean the switch mechanism on the joystick or control pad using an electronics-safe contact cleaner. Actuate the button several times to free any debris.

4. 4

   Component replacement

   If the button is internally shorted or physically broken and cannot be freed, replace the specific keypad section or the entire A004 control console/joystick assembly.

5. 5

   Reassembly

   Reconnect the wiring harness to the A004 console and reinstall the right mudguard trim panels.

6. 6

   Calibration and testing

   Reconnect the battery. Turn on the ignition and use the tractor's terminal or FENDIAS to clear the stored A.1.C3 fault code. Test the floating position button to ensure the spool valves engage the floating position correctly.