Case IH 520585-05 - BCM – BCM: Right brake indicator light - open circuit

The control module has detected a lack of electrical continuity in the circuit responsible for illuminating the right brake indicator on the dash. The underlying condition is typically a burnt-out bulb, a disconnected wiring harness, or a broken wire between the module and the instrument panel.

• MAGNUM AFS Connect
• Magnum 400 AFS Connect

1. 1

   Visual Bulb Check: Turn the key to the ON position and depress the right brake pedal. Verify if the right brake indicator light fails to illuminate.

2. 2

   Harness Inspection: Inspect the wiring harness running from the BCM to the instrument cluster/indicator panel for visible signs of chafing, pinching, or disconnected plugs.

3. 3

   Pin & Connector Check: Disconnect the harness at the dash panel and the BCM. Inspect the connector pins for corrosion, moisture, or pushed-out pins that could cause an open circuit.

4. 4

   Continuity Testing: Use a digital multimeter to test for continuity on the signal wire between the BCM output pin and the indicator light socket.

5. 5

   Ground Verification: Ensure the ground circuit for the instrument cluster/indicator light is intact and securely fastened.

1. 1

   Prep the Machine

   Park the tractor on a level surface, turn off the ignition, and disconnect the battery ground cable to prevent electrical shorts.

2. 2

   Access the Indicator Panel

   Remove the necessary steering column shrouds or dash trim panels to access the rear of the instrument cluster or the specific indicator light panel.

3. 3

   Inspect/Replace the Bulb

   Locate the socket for the right brake indicator. Twist and remove the socket. If the bulb filament is broken or blackened, replace the bulb. (Note: If your specific AFS Connect monitor/dash uses a sealed LED cluster, the bulb cannot be serviced individually).

4. 4

   Repair Wiring (If Applicable)

   If the bulb is good but the continuity test failed, trace the wire back to the BCM. Repair any broken wires using solder and heat-shrink tubing.

5. 5

   Clean Connections

   Spray the BCM and cluster connectors with electrical contact cleaner. Apply a small amount of dielectric grease to the connector seals and firmly reconnect them.

6. 6

   Reassemble and Test

   Reinstall the dash panels and reconnect the battery. Turn the ignition ON and press the right brake pedal to confirm the light now illuminates.

7. 7

   Clear the Code

   Use the tractor's onboard diagnostic display or a dealer scan tool to clear the inactive 520585-05 fault code from the BCM.