Fendt 0F.1.1E – Basic Control Unit ECU (A050) or Central Electrical System ECU (A038): M004 - Rear wiper motor: Function non-operable

The rear wiper motor end position timed out and the wiper tries to restart. This means the motor is either electrically dead or mechanically stalled/binding, preventing it from reaching its designated parking position.

• 922 Vario COM III
• 924 Vario COM III
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• 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 / SCR)
• Fendt 800 Vario (COM III / S4)
• Fendt 900 Vario (COM III / SCR / S4)
• Fendt 916 Vario
• Fendt 920 Vario
• Fendt 922 Vario
• Fendt 924 Vario
• Fendt 926 Vario
• Fendt 927 Vario
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• Fendt 933 Vario
• Fendt 936 Vario
• Fendt 939 Vario

1. 1

   Mechanical Binding: Check if the wiper arm or blade is physically stuck, frozen, or binding on the glass.

2. 2

   Electrical Testing: Test the rear wiper motor (M004) in the same manner as the front wiper motor (M002) to verify if the motor itself has failed.

3. 3

   Wiring & Connectors: Inspect the separation point connector (X258) located behind the roof lining on the upper right of the rear window. Check for loose pins, moisture, or corrosion.

4. 4

   Switch Check: Verify the integrity of the rear wiper motor switch (X273) inside the cab.

1. 1

   Locate rear wiper motor

   Inside the cab, locate the rear wiper motor (M004) on the upper right of the rear window.

2. 2

   Detach interior panel

   Detach the interior panel / roof lining to access the motor wiring.

3. 3

   Disconnect electrical connector

   Disconnect the electrical separation point (connector X258) behind the roof lining.

4. 4

   Remove wiper arm nut

   On the exterior of the rear window, remove the protective cap and the M8 hex nut securing the wiper arm.

5. 5

   Remove wiper arm

   Pull off the wiper arm, taking care not to lose the spacer and washer seals.

6. 6

   Remove faulty wiper motor

   Unscrew the base plate and cover to remove the faulty wiper motor from the glass.

7. 7

   Install new wiper motor

   Install the new wiper motor. Ensure the rubber plates and washer seals are correctly positioned to prevent water ingress into the cab.

8. 8

   Reconnect wiring

   Guide the wiring through the grommet in the cab roof and reconnect the X258 electrical connector. Fasten any surplus wiring with a cable tie.

9. 9

   Reinstall wiper arm

   Reinstall the wiper arm. Crucial step: Adjust the wiper width, wiping angle, and parking position before fully tightening the M8 hex nut.

10. 10

    Test wiper function

    Turn on the tractor and test the wiper function to ensure the code clears and the motor parks correctly.