Fendt 4.1.32 – Transmission / Overall System: A034 - Driving switch, CAN bus

This code indicates a signal fault or communication failure originating from the 'Activation button' on the main driving switch (the Vario joystick). When this fault is triggered, the tractor will typically restrict certain functions (like auxiliary valve operation) but will allow continuation in emergency mode.

• 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 300 Vario (COM III)
• Fendt 400 Vario (COM III) 409
• Fendt 400 Vario (COM III) 410
• Fendt 400 Vario (COM III) 411
• Fendt 400 Vario (COM III) 412
• Fendt 700 Vario (COM III) 711
• Fendt 700 Vario (COM III) 712
• Fendt 700 Vario (COM III) 714
• Fendt 700 Vario (COM III) 716
• Fendt 800 Vario (COM III) 815
• Fendt 800 Vario (COM III) 817
• Fendt 800 Vario (COM III) 818
• Fendt 900 Vario / Favorit 900 (COM III) 916
• Fendt 900 Vario / Favorit 900 (COM III) 920
• Fendt 900 Vario / Favorit 900 (COM III) 924
• Fendt 900 Vario / Favorit 900 (COM III) 926
• Fendt 900 Vario / Favorit 900 (COM III) 930

1. 1

   Physically inspect the activation button on the joystick for sticking, debris, or mechanical damage.

2. 2

   Inspect the CAN bus wiring harness and connectors between the A034 joystick and the A002 Enhanced Control ECU for chafing, corrosion, or loose pins.

3. 3

   Connect the FENDIAS diagnostic tool to check the A034 drive switch for internal memory faults, such as EEPROM initialization errors, routing data faults, or byte address checksum errors.

1. 1

   Clear and Retest

   Clear the fault code using the tractor's terminal or FENDIAS and cycle the ignition to see if the fault returns immediately (hard fault) or intermittently.

2. 2

   Repair Wiring

   If harness damage is found between the A002 ECU and A034 joystick, repair the wiring or replace the damaged connector pins.

3. 3

   Software Reprogramming (EOL)

   If FENDIAS indicates a checksum or EEPROM error within the joystick, you must run a new EOL (End of Line) programming procedure for the A034 joystick. This often resolves software-induced signal faults without needing hardware replacement.

4. 4

   Replace the Joystick

   If the wiring is intact, EOL programming fails or cannot be completed, and the physical activation button is internally shorted/failed, the A034 joystick assembly must be replaced.

5. 5

   Recalibrate

   After installing a new joystick, use FENDIAS to perform the EOL programming and teach-in procedures to pair the new joystick with the A002 ECU.