Fendt 9.1.D1 – Enhanced Control ECU (A002): S022 - "Lower" front power lift external pushbutton — Key fault.

The system has detected a signal fault or malfunction with the external "Lower" button (S022) for the front power lift. This is typically caused by a faulty button, a wiring/signal fault, or the button being physically stuck. The front power lift cannot be lowered properly using the external controls, and the button is rendered inoperable until the next trouble-free cold start.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• 300 Vario Series
• 400 Vario Series
• 409
• 410
• 411
• 412
• 500 Vario Series
• 700 Vario Series
• 711
• 712
• 714
• 716
• 800 Vario Series
• 815
• 817
• 818
• 820
• 900 Vario Series
• 916
• 920
• 924
• 926
• 930
• 936

1. 1

   Inspect the S022 external pushbutton on the front power lift for physical damage, packed dirt, or debris, ensuring the button springs back freely.

2. 2

   Inspect the wiring harness leading to the S022 switch for chafed wires, broken connections, or corrosion inside the 2-pin connector.

3. 3

   Perform a continuity test on the switch using a multimeter to ensure proper continuity when pressed and released (a shorted or open circuit indicates internal failure).

4. 4

   Perform a cold start reset by cycling the tractor's power after cleaning the button to see if the fault clears.

1. 1

   Power Down

   Turn off the tractor and remove the key to ensure the ECU is powered down.

2. 2

   Access the Switch

   Locate the external front power lift control panel on the front of the tractor.

3. 3

   Disconnect

   Unplug the electrical connector from the back of the S022 "Lower" switch. Clean the harness connector with electrical contact cleaner and apply dielectric grease to prevent future corrosion.

4. 4

   Remove the Switch

   Unclip or unscrew the faulty S022 pushbutton from its mounting housing.

5. 5

   Install the New Switch

   Insert the replacement switch into the housing and secure it.

6. 6

   Reconnect

   Plug the wiring harness back into the switch.

7. 7

   Clear Codes & Test

   Turn the tractor on (cold start). Use the tractor's terminal/dashboard to navigate to the fault code memory and clear the stored 9.1.D1 code. Test the external "Lower" button to confirm the front power lift operates smoothly.