Fendt 5.1.93 – EPC REAR / ACTUATORS (Joystick): "Front automatic ON / OFF" key in joystick. Signal fault.

The system has detected a signal fault or electrical failure originating from the button on the joystick that controls the front automatic mode. The front automatic mode will not function.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Farmer 400 series
• Favorit 700 series
• Favorit 900 series
• 300 Vario series
• 400 Vario series
• 700 Vario series
• 800 Vario series
• 900 Vario series
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario

1. 1

   Inspect the "Front automatic ON / OFF" button on the joystick for physical damage, sticking, or lack of tactile feedback.

2. 2

   Verify the CAN bus connection between the joystick (A034) and the Enhanced Control Unit (A002). Look for damaged wiring harnesses or loose pins at the joystick connector.

3. 3

   Connect the tractor to FENDIAS (Fendt's diagnostic software) and use the "Variowin Joystick diagnose" tool to monitor the live signal of the button press to confirm if the signal is completely dead or intermittent.

1. 1

   Remove the Joystick

   Disconnect the battery. Carefully remove the joystick/drive lever assembly from the tractor's multi-function armrest. Disconnect the CAN bus and electrical harness connectors.

2. 2

   Evaluate for Repair vs. Replacement

   If the fault is purely mechanical (a broken plastic button), aftermarket repair kits are available to replace individual buttons without replacing the whole unit. If the internal microswitch or circuit board is damaged, specialized agricultural electronics repair shops (such as Ilgenfritz Mechatronics) offer rebuild services for Fendt Vario joysticks, which is often much cheaper than buying a new OEM unit.

3. 3

   Install the Unit

   Install the repaired or new replacement joystick back into the armrest and reconnect the wiring harness.

4. 4

   Clear Codes

   Turn on the tractor and use the dash terminal or FENDIAS to clear the stored 5.1.93 fault code. Test the front automatic function to ensure the signal is restored.