Fendt 4.1.74 – TRANSMISSION: Hand brake ON/OFF sensor' solenoid switch (Position sensor parking brake) — Signal fault / Signal failure

The system cannot detect the position of the hand brake. As a result, the hand brake automatic mode is disabled, and the Tractor Management System (TMS) is switched off.

• 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
• 300 Vario (COM III)
• 400 Vario (COM III)
• 700 Vario (COM III / SCR)
• 800 Vario (COM III)
• 900 Vario (COM III / S4)

1. 1

   Locate the S015 switch on the left side of the cab, directly on the hand brake lever assembly (requires removing side cover panels)

2. 2

   Inspect the wiring harness and the X226 separation point/connector for cable breaks, short circuits, or corrosion

3. 3

   Test the switch resistance with a multimeter: it should read 121 ohms when the hand brake is released (switch closed) and 510 ohms when applied (switch open)

4. 4

   Check the mechanical adjustment of the switch to ensure it actuates exactly at the 2nd tooth of the hand brake lever's travel

1. 1

   Secure tractor

   Park the tractor on a level surface, turn off the engine, and chock the wheels (since you will be manipulating the parking brake).

2. 2

   Remove cover panels

   Remove the interior cover panels on the left side of the cab to expose the hand brake lever mechanism.

3. 3

   Disconnect electrical connector

   Disconnect the X226 electrical connector from the S015 hand brake switch.

4. 4

   Remove faulty switch

   If the switch failed the resistance test or is physically broken, unbolt the faulty switch from its mounting bracket.

5. 5

   Install new switch

   Install the new S015 switch.

6. 6

   Adjust switch position

   Adjust the mounting position of the new switch so that it mechanically switches states exactly when the hand brake lever reaches the 2nd tooth of the ratchet mechanism.

7. 7

   Reconnect wiring

   Reconnect the X226 wiring harness.

8. 8

   Reinstall panels

   Reinstall the cab cover panels.

9. 9

   Verify repair

   Turn on the tractor and verify that the TMS system is active and the fault code has cleared (you may need to clear historical codes via the FENDIAS diagnostic tool).