Fendt 0F.1.0C – Central Electrical System ECU: Rear direction indicator, right

Function non-operable. The system has detected an open circuit, short circuit, or lack of current draw on the right rear turn signal circuit, meaning the indicator is not functioning.

• 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 (Farmer 400 / COM III)
• Fendt 700 Vario (Favorit 700 / COM III / SCR)
• Fendt 800 Vario (COM III / SCR)
• Fendt 900 Vario (Favorit 900 / COM III / SCR)

1. 1

   Check the right rear turn signal housing for physical damage, water ingress, or a shattered lens

2. 2

   Remove the lens and inspect the 12V 21W indicator bulb filament for a blown bulb (most common cause)

3. 3

   Inspect the bulb socket for rust, corrosion, or melted plastic which can cause an open circuit

4. 4

   Trace the wiring from the right rear tail light assembly back to the chassis harness, checking connector X917 for loose pins, corrosion, or broken wires

5. 5

   Use a multimeter to check for pulsing 12V power at the socket when the right turn signal or hazard lights are activated

1. 1

   Ensure Safety

   Turn off the tractor, remove the key, and engage the parking brake.

2. 2

   Access the Bulb

   Unscrew the retaining screws on the right rear tail light lens cover and carefully pull the lens away.

3. 3

   Replace the Bulb

   Push in and twist the indicator bulb counterclockwise to remove it. Install a new 12V 21W bulb (usually a PY21W or P21W depending on the specific housing) by pushing in and twisting clockwise.

4. 4

   Clean Contacts

   If the socket is corroded, use electrical contact cleaner and a small wire brush to clean the terminals. Apply a small amount of dielectric grease to prevent future moisture intrusion.

5. 5

   Replace Assembly (If Necessary)

   If the housing is cracked, the socket is melted, or the unit is a sealed LED assembly that has failed, disconnect the wiring harness at the quick-connector (X917). Unbolt the housing from the fender/cab mount, bolt the new assembly in place, and plug in the connector.

6. 6

   Clear Codes

   Turn the ignition on, test the right turn signal, and use the tractor's terminal to clear the stored fault code from the Central Electrical System ECU memory.