Case IH 520440-03 - BCM – BCM: Field light memory 2 recall indicator - short circuit to B+

The circuit responsible for the "Field light memory 2 recall indicator" is experiencing a short circuit to battery positive (B+). This means voltage is reaching the indicator circuit where it shouldn't be, likely due to a wiring fault or internal module failure.

• MAGNUM AFS Connect
• Magnum AFS Connect Series
• Magnum 400 AFS Connect
• Model 250
• Model 280
• Model 310
• Model 340
• Model 380

1. 1

   Perform a function test of the exterior lighting and field light memory switches to see if the BCM is communicating properly with the rest of the network.

2. 2

   Perform a full OBD / System Scan to check for other related communication codes (such as U0140 - Lost Communication with Body Control Module) to rule out a broader network failure.

3. 3

   Visually inspect the BCM and its connectors for liquid spills, leaks, physical vibration damage, or corrosion.

4. 4

   Use a multimeter on the field light memory 2 indicator circuit to verify the presence of the short to B+. Check for faulty wiring or excessive electrical loads caused by aftermarket accessories.

1. 1

   Isolate the circuit

   Disconnect the battery to prevent further electrical damage.

2. 2

   Inspect the wiring harness

   Trace the wiring from the field light memory 2 switch/indicator back to the BCM. Look for chafed wires, melted insulation, or pinched harnesses that could cause the wire to short to a constant power source (B+).

3. 3

   Check connectors

   Disconnect the BCM harness and inspect the pins. Clean any corrosion and ensure no pins are bent or bridging.

4. 4

   Repair wiring

   If a short is found in the harness, splice and repair the damaged section of the wire using appropriate weather-sealed connectors.

5. 5

   Test the module

   Reconnect power and test the circuit. If the wiring is completely intact but the short to B+ remains active, the BCM has likely suffered an internal failure and will need to be replaced or remanufactured.