Fendt 0.0.12 – A008 Vario terminal: Terminal Bus Failure / Bus fault

The fault indicates a loss of communication on the CAN bus network. The primary cause is a failure in the voltage/power supply to the CAN bus, which prevents the terminal from communicating with the rest of the tractor's systems.

• 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
• 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
• Fendt Farmer 400
• Fendt Favorit 700
• Fendt Favorit 900 (chassis number 23/3001 and up)
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)

1. 1

   Verify Symptoms: Confirm that the Vario terminal has no display and no functions are available.

2. 2

   Check the Power Supply: The voltage supply for the CAN bus originates from the A013 printed circuit board.

3. 3

   Inspect Fuses: Locate the A013 fuse board and test fuses F039 and F046. A blown fuse here is the most common cause of this specific bus fault.

1. 1

   Disconnect battery

   Turn off the tractor ignition and disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Access fuse panel

   Access the central electrics / fuse panel where the A013 printed circuit board is located.

3. 3

   Locate fuses

   Locate fuses F039 and F046 on the A013 board.

4. 4

   Test fuses

   Test both fuses with a multimeter for continuity.

5. 5

   Replace blown fuses

   If either fuse is blown, replace it with a new fuse of the exact same amperage rating (refer to the fuse panel diagram for the specific amperage, as it varies slightly by model).

6. 6

   Test system

   Reconnect the battery and turn the ignition ON. Check if the Vario terminal powers up and the fault code clears.

7. 7

   Inspect wiring harness

   If the fuses are intact but the fault persists, inspect the wiring harness connecting the A013 board to the A008 Vario terminal for chafing, breaks, or loose connector pins.

8. 8

   Replace hardware

   If wiring is verified as good, the A013 circuit board or the A008 Vario terminal itself may have suffered an internal hardware failure and will require replacement.