New Holland UCM 1511 – UCM: Right Brake Light Actuation: Open Circuit

The control module has detected a break in the electrical path responsible for illuminating the right brake light. This underlying condition is typically caused by a blown light bulb, a disconnected or loose wiring connector, a severed wire in the rear harness, or a failure within the control module's output circuit.

• L213
• L215
• L218
• L220
• L223
• L225
• L230
• C227
• C232
• C238
• SR130
• SR150
• SR175
• SR200
• SR220
• SV185

1. 1

   Visual Bulb Inspection: Check the right rear brake light bulb to see if the filament is broken or burnt out, which is the most common cause of an open circuit.

2. 2

   Connector Check: Inspect the wiring harness connector at the right tail light assembly for loose pins, moisture, or corrosion.

3. 3

   Harness Continuity: Use a multimeter to check for continuity along the right brake light circuit from the UCM to the rear light assembly to rule out a severed wire.

4. 4

   Voltage Test: Verify if voltage is being sent to the right brake light connector when the brake is actuated to ensure the UCM is outputting the correct signal.

1. 1

   Safely park the machine on level ground, engage the parking brake, shut off the engine, and remove the key.

   Safely park the machine on level ground, engage the parking brake, shut off the engine, and remove the key.

2. 2

   Wait for all machine movement to stop before exiting the operator's platform.

   Wait for all machine movement to stop before exiting the operator's platform.

3. 3

   Access the right rear tail light assembly. Depending on the specific housing, remove the lens cover by withdrawing the retaining screws or unbolt the entire sealed assembly.

   Access the right rear tail light assembly. Depending on the specific housing, remove the lens cover by withdrawing the retaining screws or unbolt the entire sealed assembly.

4. 4

   If the bulb is accessible and blown, depress it slightly and rotate it counter-clockwise to remove it. Install the new bulb by aligning the offset pins with the socket correctly.

   If the bulb is accessible and blown, depress it slightly and rotate it counter-clockwise to remove it. Install the new bulb by aligning the offset pins with the socket correctly.

5. 5

   If the entire assembly is a sealed LED unit or damaged, disconnect the main wiring harness pigtail and unbolt the housing to replace the whole assembly.

   If the entire assembly is a sealed LED unit or damaged, disconnect the main wiring harness pigtail and unbolt the housing to replace the whole assembly.

6. 6

   If the bulb/assembly is functional but the wiring is damaged, repair the open circuit in the wiring harness by splicing the broken wire or replacing the damaged connector.

   If the bulb/assembly is functional but the wiring is damaged, repair the open circuit in the wiring harness by splicing the broken wire or replacing the damaged connector.

7. 7

   Reinstall the lens cover or light assembly.

   Reinstall the lens cover or light assembly.

8. 8

   Turn the machine's key to the ON position and actuate the brakes to test the circuit and ensure the UCM 1511 fault code clears.

   Turn the machine's key to the ON position and actuate the brakes to test the circuit and ensure the UCM 1511 fault code clears.