Case IH 520443-05 - BCM – BCM: Roof mounted headlamp high beam right - open circuit

The control module has detected that the electrical circuit supplying power to the right-side roof-mounted high beam headlamp is incomplete. This is most commonly caused by a blown light bulb, a disconnected electrical plug, or a severed wire in the harness.

• MAGNUM AFS Connect
• Magnum AFS Connect 180
• Magnum AFS Connect 200
• Magnum AFS Connect 220
• Magnum AFS Connect 240
• Magnum AFS Connect 250
• Magnum AFS Connect 280
• Magnum AFS Connect 310
• Magnum AFS Connect 340
• Magnum AFS Connect 380
• Magnum AFS Connect 400

1. 1

   Visually inspect the right roof-mounted high beam headlamp bulb to see if the filament is broken or the LED array has failed.

2. 2

   Inspect the electrical connector at the headlamp assembly for looseness, moisture, corrosion, or pushed-out pins.

3. 3

   Using a multimeter, test the wiring harness for continuity between the headlamp connector and the BCM to locate any open circuits or wire breaks.

4. 4

   Verify that the ground connection for the roof lighting circuit is secure and free of rust or paint interference.

1. 1

   Power Down

   Ensure the tractor is turned off and the key is removed to unpower the lighting circuit.

2. 2

   Access the Headlamp

   Safely access the right roof-mounted headlamp assembly on the cab roof.

3. 3

   Disconnect

   Disconnect the electrical wiring harness connection from the back of the light assembly.

4. 4

   Replace the Bulb/Assembly

   For halogen setups: Turn the light bulb, extract it, and replace it with a new one of the exact same power rating. Avoid touching the new bulb glass with bare fingers. For sealed LED setups: Unbolt the mounting bracket and replace the entire LED work light assembly.

5. 5

   Harness Repair (If Applicable)

   If the bulb is intact but the circuit is open, trace the wiring harness back toward the BCM. Splice and heat-shrink any severed wires, or replace damaged connector pigtails.

6. 6

   Test and Clear

   Reconnect the headlamp assembly. Power on the tractor, activate the high beams, and verify the light illuminates. Clear the fault code via the AFS Pro 1200 display or a diagnostic service tool.