Fendt 4.1.70 – TRANSMISSION: A004 - 'Cruise control 1' key — Key fault

Electrical signal failure, button malfunction, or CAN bus communication error originating from the 'Cruise Control 1' button located on the tractor's main operating console/joystick. As a direct safety consequence, the system locks out the feature, and Cruise Control cannot be activated.

• 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
• Farmer 400 Vario (409, 410, 411, 412)
• Favorit 700 / 700 Vario (711, 712, 714, 716)
• 800 Vario (815, 817, 818)
• Favorit 900 / 900 Vario (916, 920, 924, 926, 930)

1. 1

   Inspect the Cruise Control 1 button on the A004 Vario joystick for physical damage, sticking, or lack of a tactile click (indicating a collapsed microswitch)

2. 2

   Inspect the wiring harness exiting the A004 control console/armrest for pinched wires, chafing, or loose connector pins

3. 3

   Test the CAN bus lines between the A004 console and the Transmission Control Module for continuity and proper voltage

4. 4

   Verify that the A004 console is receiving proper voltage (check associated fuses and printed circuit board A013)

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to prevent electrical shorts during disassembly.

2. 2

   Access the Joystick

   Carefully remove the housing/trim on the multifunction armrest to access the A004 Vario joystick assembly.

3. 3

   Repair Wiring

   If diagnostic testing revealed a break in the bus communication line between the armrest and the transmission ECU, repair the damaged wire or replace the sub-harness.

4. 4

   Replace the Button/Switch

   If the wiring is intact but the button has failed mechanically or electrically, disassemble the joystick handle to replace the specific microswitch/button pad.

5. 5

   Replace the A004 Console

   If the internal circuit board of the joystick has failed and is not outputting the bus signal, unbolt the A004 joystick assembly, disconnect the main harness plug, and install a new OEM joystick.

6. 6

   Reassemble and Clear Codes

   Reconnect the battery, turn the ignition on, and use the Fendt diagnostic terminal to clear the 4.1.70 fault code. Test drive the tractor to ensure Cruise Control 1 activates properly.