Fendt 00.0.03 – Overall System / General Bus: Multifunction armrest bus fault

The EOL (End of Line) programming does not report to the bus. Tractor functions controlled by the armrest become non-operational, and programming/display functions are lost.

• 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) (Models 919, 922, 925, 928, 931, 934, 936)

1. 1

   Verify the CAN bus wiring and connections between the A039 multifunction armrest and the A050 basic control unit.

2. 2

   Test the A039 multifunction armrest using the Fendt 160-pin adapter box to isolate hardware failures from wiring issues.

3. 3

   Verify if the module has simply lost its End of Line (EOL) programming.

1. 1

   Inspect Wiring

   Check the wiring harness routing from the driver's seat/armrest console to the main tractor electronics for pinches, breaks, or loose connector pins.

2. 2

   Reprogram the Module

   If the wiring and adapter box tests pass, connect the tractor to the FENDIAS diagnostic software. Perform an EOL (End of Line) reprogramming of the A039 multifunction armrest.

3. 3

   Replace the MFA

   If the armrest module will not accept EOL reprogramming or fails the 160-pin adapter box test, the internal bus controller in the armrest has failed. Remove the armrest console from the driver's seat and install a replacement A039 unit.

4. 4

   Calibrate

   After installing a new armrest, use FENDIAS to perform EOL programming on the new module so it can communicate with the A050 Basic Control Unit.