John Deere 002386.06 – RLC: Flashing Light High Amp Draw Cab Roof Module

The Cab Roof Module (RLC) has detected that the electrical current flowing to the flashing beacon light is above the normal operating range. This over-current condition prompts the RLC's internal solid-state load center to shut down the specific circuit to prevent damage and log the fault code. The circuit will remain disabled until the operator cycles the switch for that function.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R (2015-2021)

1. 1

   Cycle the flashing light switch off and then on again to see if the fault code immediately returns, indicating a persistent fault.

2. 2

   Visually inspect the flashing beacon light assembly for any signs of damage, water ingress, or corrosion.

3. 3

   Check for any non-factory electrical accessories spliced into the flashing light circuit that could be overloading it.

4. 4

   Disconnect the wiring harness at the base of the flashing beacon light assembly and activate the circuit to see if the fault persists (this isolates the light from the wiring/module).

5. 5

   Inspect the wiring harness for damage, chafing, or improper routing that could cause a partial short to the chassis, paying close attention to areas where the harness passes through the cab roof or near sharp metal edges.

6. 6

   If both the beacon light and the wiring harness are confirmed to be in good condition, suspect the Cab Roof Module (RLC) which may have an internal failure of the driver for the beacon light circuit.

1. 1

   Ensure safety and access component

   Park the tractor on a level surface, engage the parking brake, turn off the engine, and remove the key. Access the beacon light on the cab roof.

2. 2

   Test and replace beacon light

   With the wiring harness disconnected from the beacon light, turn on the switch. If the fault code does NOT return, the beacon light assembly has an internal short or failing motor. Replace the beacon light assembly with a new OEM or equivalent part.

3. 3

   Repair or replace wiring harness

   If the fault code DOES return with the light disconnected, the issue is in the wiring or RLC. Repair or replace the damaged section of the wiring harness. Ensure all connections are clean and secure.

4. 4

   Diagnose Cab Roof Module (RLC)

   If both the beacon light and wiring harness are confirmed to be in good condition, the RLC may have an internal driver failure. Have a certified John Deere technician diagnose the RLC using the Service ADVISOR™ tool before replacement.

5. 5

   Reassemble and verify

   Reconnect all wiring, reassemble any removed roof panels, and turn on the tractor. Activate the flashing light and verify that the fault code has been cleared and does not return.