John Deere 002350.05 – BLC: Low Amps at Headlight Low Beam

The Main Control Module (BLC) or Vehicle Load Center (VLC) has detected a lower-than-expected electrical current (amperage) at the pin designated for the low beam headlights when activated. This indicates an open circuit or high resistance in the lighting circuit, which is most commonly caused by a blown headlight bulb, poor electrical connections, or the installation of aftermarket LED bulbs that draw less current than standard halogen bulbs.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M

1. 1

   Visually inspect the low beam headlights to check for a blown bulb (most common cause)

2. 2

   Inspect electrical connectors at the back of the headlight assembly and along the wiring harness for corrosion, dirt, or damage

3. 3

   Check ground connections for the headlight circuit for faults or corrosion causing high resistance

4. 4

   Review the system for any other active fault codes related to the BLC/VLC or lighting system

1. 1

   Prepare machine

   Park the machine safely on level ground, lower all implements, shut off the engine, and remove the key. Disconnect the battery's negative terminal.

2. 2

   Replace low beam bulb

   If a blown bulb is found, access the headlight housing (may require opening the hood), rotate the bulb socket to remove it, and install a new bulb. It is advisable to replace bulbs in pairs to ensure even lighting and lifespan.

3. 3

   Clean and secure connections

   If the bulb is intact, disconnect the headlight wiring harness connector. Clean the contacts inside the connector and on the bulb socket using electrical contact cleaner, then securely re-seat the connector.

4. 4

   Inspect wiring harness

   Trace the wiring from the headlight back towards the main harness. Look for any visible damage, chafing, or compromised areas and repair as needed.

5. 5

   Clear fault codes

   Reconnect the battery, start the tractor, and check if the fault code clears. Cycling the key switch may be sufficient on some systems.

6. 6

   Perform advanced diagnosis

   If the code persists, use a multimeter to check for voltage, continuity, and resistance in the circuit from the BLC/VLC to the headlight using an official wiring diagram and pinout chart.