New Holland 4309 – UCM: Park Brake Button Timeout (30 Seconds) White

The Universal Control Module (UCM) has detected that the park brake button was not activated within the expected 30-second timeframe after a condition requiring its activation occurred. This timeout error indicates a failure in the input signal from the operator controls to the control module, which may be caused by a faulty park brake button, damaged associated wiring, or issues with related safety interlock sensors.

• T6030
• T6040
• L220
• L230
• T4.75
• TM115
• TM125
• TM135
• TM150
• TS90
• TS100
• TS110
• TS115
• 1068
• 1069
• 1075
• 8500
• LM860

1. 1

   Check for other active fault codes, particularly those related to the park brake solenoid or pressure switch (e.g., 4055, 4056, 4057, or 4431), as they can cause subsequent timeout faults

2. 2

   Inspect the wiring harness and connectors leading to the park brake switch and the UCM for damage, corrosion, or loose connections, paying special attention to wires under the operator's seat

3. 3

   Check the operator presence switch in the seat and its wiring, as a faulty seat switch can trigger park brake-related symptoms

4. 4

   Verify battery voltage is sufficient and ensure all chassis ground connections are clean and tight to prevent erroneous codes

1. 1

   Test the park brake switch

   Disconnect the electrical connector from the park brake switch. Use a multimeter to test for continuity across the switch terminals while pressing and releasing the button. Replace the switch if it does not show a state change or is stuck in one position.

2. 2

   Test the circuit wiring

   With the switch and UCM disconnected, check for continuity on the signal wire from the switch connector to the corresponding pin at the UCM to identify open circuits. Also, test for short circuits from the signal wire to ground and power wires.

3. 3

   Inspect related components

   If the button and wiring test good, investigate the park brake solenoid and pressure switch. The system logic may cross-reference inputs, and a disagreement between these components can trigger the fault.

4. 4

   Evaluate the UCM

   If the switch, wiring, and related components are confirmed to be in good working order, the fault may lie within the Universal Control Module (UCM) itself, though this is the least likely cause.