John Deere 521559.05 – RLC: Rear Side Roof Flood Light Right Current Low

This code indicates that the control module is commanding the right rear side roof flood light to turn on, but it is detecting a lower electrical current draw than expected. This typically points to an open circuit, a blown halogen bulb, a failed LED assembly, a disconnected connector, or a broken wire in the harness.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8245R
• 8270R
• 8295R
• 8320R
• 8345R
• 8370R
• 8400R
• 9470RT
• 9520RT
• 9570RT

1. 1

   Visually inspect the right rear side roof flood light for a burnt-out bulb or failed LED array

2. 2

   Disconnect the light and inspect the connector pins for corrosion, moisture intrusion, or loose terminals

3. 3

   Trace the wiring harness from the right rear roof light back to the RLC (Cab Roof Module) and check for pinched, chafed, or broken wires

4. 4

   Verify that the ground wire for the light assembly is secure and free of corrosion

1. 1

   Access cab roof

   Safely access the right rear side of the cab roof.

2. 2

   Disconnect pigtail

   Disconnect the electrical pigtail from the right rear side roof flood light.

3. 3

   Inspect connector

   Inspect the connector for green copper corrosion or pushed-out pins. Clean with electrical contact cleaner if necessary.

4. 4

   Test light assembly

   Test the light assembly by applying direct 12V power and ground (or swap it temporarily with the left side light). If the light does not illuminate, the assembly is faulty and must be replaced.

5. 5

   Test wiring harness

   If the light works perfectly when bypassed, use a multimeter to test the wiring harness for continuity between the light connector and the RLC module in the cab roof. Repair any broken wires found.

6. 6

   Install or re-secure

   Install the new light or re-secure the repaired wiring.

7. 7

   Verify operation and clear code

   Turn on the tractor and the work lights to verify operation. Clear the stored 521559.05 fault code via the cab monitor.