Fendt 8.3.14 – Rear EPC (Electrohydraulic Power Control) control module / A014 - ECU, EPC OBE: Raise' rear power lift external pushbutton, cab, left rear — Signal line fault, key fault

The external 'Raise' button (switch S029) located on the left rear fender or cab exterior is defective, stuck in the pressed position (key fault), or has a fault in its signal wiring. As a safety consequence, the electrohydraulic power lift control is immediately terminated and locked out by the system to prevent unintended movement of the rear hitch.

• 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 series
• Fendt Favorit 700 series
• Fendt Favorit 900 series
• Fendt 300 Vario COM III series
• Fendt 400 Vario COM III series
• Fendt 500 Vario COM III series
• Fendt 700 Vario COM III series
• Fendt 800 Vario COM III series
• Fendt 900 Vario COM III series
• 711
• 712
• 714
• 716
• 815
• 817
• 818
• 916
• 920
• 924
• 926
• 930

1. 1

   Ensure the tractor is turned off, the transmission is in PARK, and the rear hitch area is clear of personnel before diagnosing.

2. 2

   Inspect the S029 left rear 'Raise' pushbutton to see if it is physically jammed, packed with dirt, or stuck in the depressed position.

3. 3

   Disconnect the switch and inspect the connector pins for corrosion or moisture ingress.

4. 4

   Use a multimeter to check the signal line between the S029 switch and the A014 Rear EPC control module for an open circuit, short to ground, or short to power.

5. 5

   Verify if the fault clears and functionality returns after a trouble-free cold start or by unlocking the system via the terminal.

1. 1

   Prepare the tractor

   Park the tractor on a level surface, lower any attached implements (if possible), and turn off the ignition.

2. 2

   Locate the switch

   Locate the S029 'Raise' external pushbutton on the left rear fender/cab extension.

3. 3

   Remove the switch housing

   Carefully pry or unbolt the switch housing from the fender panel, depending on the specific model's trim.

4. 4

   Disconnect the wiring

   Disconnect the electrical wiring harness from the back of the switch.

5. 5

   Connect the new switch

   If the wiring tested fine during diagnostics, the switch itself has failed internally. Connect the replacement genuine Fendt switch to the wiring harness.

6. 6

   Install the new switch

   Snap or bolt the new switch securely back into the fender housing.

7. 7

   Clear the fault code

   Turn on the tractor ignition. Use the FENDIAS diagnostic tool or the tractor's terminal to clear the stored 8.3.14 fault code.

8. 8

   Test the operation

   Test the new external raise button to ensure the rear lifting arms raise correctly and that the fault does not return.