John Deere 521539.05 – RLC: Front Inner Roof Flood Light Left Current Low

The control module is detecting that the electrical current draw on the circuit for the front inner left work light is below the expected threshold, indicating an open circuit. This is most commonly caused by a burnt-out bulb, a disconnected plug, or a broken wire in the harness.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8R Series
• 8RT Series
• 8RW Series
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 9RT Series
• 9470RT
• 9520RT
• 9570RT

1. 1

   Visually inspect the front inner left roof flood light for a blown bulb (most frequent cause)

2. 2

   Check the 2-pin connector at the light assembly for pushed-out pins, corrosion, or moisture intrusion

3. 3

   Trace the wiring harness from the light back to the RLC module in the cab roof, checking for pinched, chafed, or broken wires

4. 4

   Use a multimeter to verify if the RLC module is outputting 12V to the light's connector when the work lights are commanded ON via the cab switch

1. 1

   Power Down

   Turn off the tractor, place the transmission in Park, and turn the battery disconnect switch to the OFF position to prevent electrical shorts.

2. 2

   Access the Light

   Safely access the front cab roof. Locate the inner left flood light assembly.

3. 3

   Remove and Inspect

   Disconnect the wiring harness from the back of the light. Remove the bulb/assembly.

4. 4

   Replace the Bulb/Light

   If the bulb is blown (or if it is a sealed LED unit that has failed), install a new replacement.

5. 5

   Repair Wiring (If Applicable)

   If the bulb was intact but the connector was corroded, clean the contacts with electrical contact cleaner and apply dielectric grease. If a wire is broken, splice and repair the wire using heat-shrink tubing.

6. 6

   Reassemble and Clear Codes

   Reconnect the light, restore battery power, and turn the key switch ON. Cycle the work light switch. The code may clear simply by cycling the key switch and the light. If it remains stored, clear it via the CommandCenter display.