Fendt 9.1.C4 – A004 - ECU, Control Panel: A004 - ECU, control panel; 'Raise' quick lift switch - Key fault

The system has detected a faulty button or a continuous/implausible signal from the 'Raise' quick lift switch located on the main operating console. As a result, the front power lift cannot be raised properly using the in-cab controls.

• 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
• Fendt Farmer 400 Vario
• Fendt Favorit 700 Vario
• Fendt Favorit 900 Vario
• Fendt 300 Vario
• Fendt 400 Vario
• Fendt 700 Vario
• Fendt 800 Vario
• Fendt 900 Vario

1. 1

   Test external controls by attempting to raise the front power lift using the external fender pushbuttons (switch S021). If successful, the issue is isolated to the in-cab A004 switch.

2. 2

   Inspect the 'Raise' quick lift switch on the A004 operating console for physical damage, sticking, or debris lodged around the membrane/button.

3. 3

   Check for related CAN faults (such as 9.1.C6). If present, this indicates a potential wiring or voltage supply problem (check fuses F040, F041) rather than a faulty switch.

1. 1

   Disconnect Power

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

2. 2

   Remove Trim

   Carefully remove the plastic trim and bezels surrounding the right-hand A004 operating console.

3. 3

   Disconnect Harnesses

   Unplug the main electrical connectors (CAN bus and power supply lines) from the bottom/rear of the A004 ECU.

4. 4

   Remove the Console

   Unbolt the mounting hardware securing the A004 console to the armrest/side panel and remove the unit.

5. 5

   Install Replacement/Repaired Unit

   Mount the new or refurbished A004 operating console and secure the hardware.

6. 6

   Reconnect

   Plug in all electrical harnesses and reinstall the surrounding trim. Reconnect the battery.

7. 7

   Calibration / EOL Programming

   Connect the FENDIAS diagnostic tool. Clear the stored 9.1.C4 fault code. Depending on the tractor generation, End-of-Line (EOL) programming or a teach-in procedure may be required so the main tractor ECU recognizes the new A004 control panel.