Fendt 06.1.11 – REAR PTO ENHANCED CONTROL: A039 - MFA, multifunction armrest: Rear PTO auto mode button - Faulty button, signal fault.

The tractor's system has detected an electrical signal failure or a mechanical fault (such as a stuck or broken contact) specifically in the button that controls the automatic mode for the rear Power Take-Off (PTO). As a safety precaution, the PTO disengages, and the Auto mode is forced OFF.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 200 V/F/P Vario series
• 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)
• 916
• 920
• 922
• 924
• 926
• 927
• 930
• 933
• 936

1. 1

   Check the physical condition of the Rear PTO auto mode button on the A039 multifunction armrest for sticking, mechanical damage, or debris lodged around the switch.

2. 2

   Use a 160-pin adapter box and a multimeter to test the A039/A036 component to verify if the button is sending the correct electrical signal when actuated.

3. 3

   Inspect the wiring harness and connectors between the multifunction armrest and the central electrical system for chafing or loose pins.

4. 4

   Check the 12V power supply and relevant fuses (e.g., A013 fuse 13) that supply the PTO control circuit.

5. 5

   Use the tractor's diagnostic terminal to check for related CAN bus communication faults (e.g., code 00.0.03 - Multifunction armrest bus fault) which might indicate a broader armrest failure.

1. 1

   Preparation

   Power down the tractor and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Switch

   Carefully disassemble the A039 multifunction armrest housing (or A036 control panel, depending on the exact model) to access the internal switches and wiring.

3. 3

   Removal

   Locate the specific Rear PTO auto mode button assembly. Disconnect the wiring harness connector from the faulty switch and remove the switch from its mounting point.

4. 4

   Installation

   Install the new replacement PTO command switch into the mounting point. Reconnect the wiring harness, ensuring a secure and weather-sealed connection.

5. 5

   Reassembly

   Reassemble the multifunction armrest housing carefully, ensuring no wires are pinched.

6. 6

   Testing

   Reconnect the battery and turn on the ignition. Clear the stored 06.1.11 fault code from the tractor's memory using the dashboard terminal. Test the Rear PTO auto mode to confirm proper operation.

7. 7

   Alternative Repair

   If the button is soldered directly onto the armrest's printed circuit board rather than being a standalone switch, the entire A039 armrest control unit must be replaced or sent to a specialized agricultural electronics repair facility.