Fendt 3.1.05 – A004 - Control console: A004 - Control console — Internal 8.5 V fault, keypad fault.

This code indicates an internal failure within the control console, specifically related to its internal 8.5-volt power supply or a failure of the keypad matrix. When logged, the system automatically switches off the button panel (keypad), digital and analogue inputs, and LED actuation to protect the circuitry.

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

1. 1

   Verify the external voltage supply to the CAN-Bus and the A004 console, specifically checking fuses F040 and F041 on printed circuit board A013

2. 2

   Inspect the wiring harness connecting the A004 control console to the A002 (enhanced control ECU) for chafing, corrosion, or loose pins causing voltage drops or CAN errors

3. 3

   Clear the fault codes via the multi-display/terminal and cycle the tractor's key to see if the fault is a hard failure or an intermittent glitch

1. 1

   Remove the A004 side console

   Disconnect the tractor's battery. Remove the mounting screws securing the A004 side console to the cab interior armrest/mount. Carefully disconnect the multi-pin electrical connectors from the bottom of the unit.

2. 2

   Replace or repair the control console

   The official OEM remedy is to fit a new control console. Alternatively, specialized agricultural electronics repair shops offer mail-in repair services to rebuild the internal 8.5V circuit and keypad matrix.

3. 3

   Install the new or repaired console

   Plug the connectors into the new or repaired console, mount it back into the armrest, and reconnect the battery.

4. 4

   Perform EOL programming

   Perform any necessary EOL (End of Line) programming or calibration required by the FENDIAS diagnostic tool.