John Deere 002358.06 – BLC / RLC: High Amps at Grab Rail Headlight/Work Light

The Basic Light Control (BLC) or Roof Lighting Control (RLC) module has detected excessive electrical current draw on the circuit for the grab rail-mounted headlight high beam or an associated work light. This high-amperage condition is typically caused by a failing bulb drawing too much power or a short circuit to ground. The control module flags this error to prevent damage to the wiring harness and the module itself.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC

1. 1

   Park the machine on a level surface, stop the engine, remove the key, and disconnect the battery ground strap to prevent accidental shorts

2. 2

   Visually inspect the grab rail headlight and associated work lights for cracked housings or water ingress

3. 3

   Examine the wiring harness leading to the light assembly for chafing, pinched wires, or damaged insulation that could cause a short to the frame

4. 4

   Check all accessible connectors for corrosion, bent pins, or loose connections

5. 5

   Isolate the faulty component by disconnecting lights on the circuit one at a time and cycling the lights to see if the fault clears

6. 6

   Test for a short circuit to ground in the wiring harness using a multimeter (check continuity between the power wire pin and a clean chassis ground)

7. 7

   Test the light assembly itself for an internal short by checking for continuity between its power and ground pins

1. 1

   Replace faulty bulb

   If a failing bulb is identified as the cause of the high current draw, replace it with a new one of the correct type. Do not touch the glass of a new halogen bulb with bare hands, as oils can cause premature failure.

2. 2

   Repair wiring harness

   If a short to ground is found in the harness, repair the damaged section of wire. Solder the connection and seal it with heat-shrink tubing to protect it from moisture and vibration.

3. 3

   Replace light assembly

   If the light assembly has an internal short circuit (very low resistance across power and ground pins), replace the entire assembly.

4. 4

   Reassemble and clear codes

   Reconnect all components and the battery ground strap. Turn on the lights to verify proper operation, then use a diagnostic tool to clear the fault code from the BLC or RLC module.