Case IH 520560-05 - BCM – BCM: Cab left wiper motor - open circuit

The control module has detected a break in the electrical path to the left wiper motor. The circuit is incomplete, which could be caused by a severed wire, an unplugged connector, a blown fuse, or a burned-out internal motor winding.

• MAGNUM AFS Connect
• Steiger 4WD Tractors: 370, 385, 400, 435, 450, 470, 485, 500, 550, 600, 620
• Magnum / MX Magnum Tractors: 180 through 380 series
• Puma, Maxxum, and Optum Tractors
• Axial-Flow Combines

1. 1

   Check Fuses and Relays: Locate the cab power module/fuse box and inspect the specific fuse and relay assigned to the left wiper motor.

2. 2

   Inspect the Harness and Connectors: Access the left wiper motor (usually located behind the cab roof liner or A/B pillar trim). Unplug the connector and check for backed-out pins, corrosion, or moisture.

3. 3

   Test for Power and Ground: With the key ON and the wiper switch activated, use a multimeter to check for 12V power and a solid ground at the motor connector.

4. 4

   Continuity Test: If there is no power, test the continuity of the wiring harness from the BCM output pin to the wiper motor connector to locate the break in the wire.

5. 5

   Direct Motor Test: Apply 12V power and ground directly to the wiper motor terminals. If the motor does not actuate, the internal windings are open, and the motor itself has failed.

1. 1

   Disconnect power

   Turn off the battery disconnect switch or disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Access the motor

   Remove the interior cab roof liner, corner panel, or exterior access panel (depending on the specific tractor/combine model) to expose the left wiper motor assembly.

3. 3

   Disconnect linkage

   Unbolt the wiper arm from the exterior pivot shaft. Inside the cab, disconnect the mechanical linkage from the motor if it is part of a larger assembly.

4. 4

   Remove the motor

   Unplug the electrical harness connector. Remove the mounting bracket bolts securing the motor to the cab frame.

5. 5

   Install the new motor

   Mount the replacement wiper motor and tighten the bracket bolts. Reconnect the mechanical linkage and the exterior wiper arm.

6. 6

   Reconnect and test

   Plug in the electrical connector. Reconnect the battery, turn the key ON, and test the wiper switch through all speed settings.

7. 7

   Clear codes

   Use the diagnostic interface or monitor to clear the 520560-05 inactive code from the BCM. Reinstall all cab trim panels.