Fendt 09.1.47 – A039 - MFA (Multifunction Armrest): A039 - MFA, multifunction armrest: Quick entry button, SAH front power lift (Forced lowering button, quick lift) - Faulty button, signal fault.

The system has detected an electrical signal fault or a physical malfunction (such as a stuck or shorted switch) specifically on the quick entry/forced lowering button for the front power lift. As a safety consequence, the system renders this button inoperable until the next trouble-free cold start.

• 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 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)
• Fendt 922 Vario (COM III)
• Fendt 924 Vario (COM III)
• Fendt 927 Vario (COM III)
• Fendt 930 Vario (COM III)
• Fendt 933 Vario (COM III)
• Fendt 936 Vario (COM III)

1. 1

   Inspect the quick entry/forced lowering button on the multifunction armrest for physical damage, sticking, or debris lodged around the switch housing.

2. 2

   Perform a cold start reset by turning the tractor off completely to see if a temporarily stuck button clears the fault state.

3. 3

   Test the A039 multifunction armrest using the official Fendt 160-pin adapter box to verify if the signal fault is originating from the button itself or the armrest's internal circuit board.

4. 4

   Check the internal wiring harness and connectors inside the A039 armrest for chafing or loose connections.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts or CAN bus spikes.

2. 2

   Disassemble the Armrest

   Carefully remove the outer casing of the A039 multifunction armrest to access the internal switch panels and circuit boards.

3. 3

   Isolate the Switch

   Locate the specific switch module for the SAH front power lift quick entry button.

4. 4

   Replace the Component

   Depending on the exact armrest revision, replace the faulty button mechanism. If the button is integrated directly into the MFA's printed circuit board (PCB) and cannot be serviced individually, the specific switch module or the armrest control board must be replaced.

5. 5

   Reassemble

   Reconnect all internal harnesses and reassemble the armrest casing.

6. 6

   Clear Faults

   Reconnect the battery and perform a cold start. The fault code should clear automatically if a trouble-free signal is detected. (Note: Stored codes can be manually deleted from the terminal by simultaneously pressing keys D, B, and C, depending on the display version).