Fendt 4.1.71 – Transmission Control Module (Transmission ECU): A004 - "Cruise control 2" key — Key fault

This fault code indicates a signal failure or key fault with the "Cruise control 2" button. The system has detected that the key is either stuck, internally shorted, or unavailable due to a CAN-bus communication failure originating from the A004 Side Console. As a direct consequence, the cruise control system 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
• Fendt Farmer 400 Vario series
• Fendt Favorit 700 Vario series
• Fendt Favorit 900 / 900 Vario COM III series

1. 1

   Inspect the 'Cruise control 2' key on the A004 side console for physical damage, sticking, or trapped debris that might be holding the button down

2. 2

   Test the CAN-bus connection between the EST Control module (A002) and the Side Console (A004)

3. 3

   Inspect the wiring harness and connectors associated with the 'Transmission Control' circuit for shorts to ground or broken wires

4. 4

   Check the power supply to the side console. Verify that the fuses on the A013 fuse board (which supplies the side console) are intact and not burned out

1. 1

   Power down the tractor and disconnect the battery to prevent electrical shorts during service.

   Power down the tractor and disconnect the battery to prevent electrical shorts during service.

2. 2

   Carefully pry or unscrew the A004 control console from the side armrest/panel.

   Carefully pry or unscrew the A004 control console from the side armrest/panel.

3. 3

   Disconnect the main wiring harness from the back of the console.

   Disconnect the main wiring harness from the back of the console.

4. 4

   Depending on the exact model and console generation, you will either need to replace the entire A004 Side Console unit or, if applicable to your specific Vario terminal, replace just the membrane keypad.

   Depending on the exact model and console generation, you will either need to replace the entire A004 Side Console unit or, if applicable to your specific Vario terminal, replace just the membrane keypad.

5. 5

   Install the new console or keypad, ensuring the harness clicks securely into place.

   Install the new console or keypad, ensuring the harness clicks securely into place.

6. 6

   Reconnect the battery and turn the ignition ON.

   Reconnect the battery and turn the ignition ON.

7. 7

   Use the FENDIAS diagnostic tool or the tractor's multi-display to clear the stored fault codes.

   Use the FENDIAS diagnostic tool or the tractor's multi-display to clear the stored fault codes.

8. 8

   Test drive the tractor and attempt to engage Cruise Control 2 to verify the repair.

   Test drive the tractor and attempt to engage Cruise Control 2 to verify the repair.