Case IH 4057-05 - BCM – BCM: Wiper Motor Undercurrent / Open in Wiper Motor Circuit

The controller has detected that the electrical circuit for the front windshield wiper low-speed motor is incomplete (open circuit) or drawing less current than expected. This prevents the wiper from operating in the low-speed or intermittent settings.

• MAGNUM AFS Connect
• Maxxum 5120
• Maxxum 5130
• Maxxum 5140
• Maxxum 5220
• Maxxum 5230
• Maxxum 5240
• Maxxum 5250
• Maxxum MX100
• Maxxum MX110
• Maxxum MX120
• Maxxum MX135
• Maxxum MX150
• Maxxum MX170
• Maxxum 115
• Maxxum 125
• Maxxum 135
• Maxxum 145
• Maxxum 150
• Magnum 7110
• Magnum 7120
• Magnum 7130
• Magnum 7140
• Magnum 7150
• Magnum 7210
• Magnum 7220
• Magnum 7230
• Magnum 7240
• Magnum 7250
• Magnum 8910
• Magnum 8920
• Magnum 8930
• Magnum 8940
• Magnum 8950
• Magnum MX180
• Magnum MX200
• Magnum MX220
• Magnum MX240
• Magnum MX270
• CX50
• CX60
• CX70
• CX80
• CX90
• CX100
• Puma 225 CVX
• 485XL
• 585XL
• 685XL
• 885XL
• 3220
• 3230
• 4210
• 4230
• 4240
• 585
• 695
• 895

1. 1

   Check the Wiper Switch: Verify the switch inputs to the BCM. If the switch is disconnected or failing, the inputs will pull up to accessory voltage, which can cause erratic operation or default to high speed.

2. 2

   Inspect Connectors for Deformation/Corrosion: Check the mating side of the connector terminals at the wiper motor and the BCM.

3. 3

   Circuit Resistance Test: With the ignition OFF, test the ignition/control circuit end-to-end. You should see less than 2 Ω of resistance.

4. 4

   Short-to-Ground Test: Test for infinite resistance between the ignition circuit and ground.

5. 5

   Relay Check: Check the Wiper ON/OFF and High/Low relays (if equipped externally from the BCM) for proper operation and seated pins.

1. 1

   Power Down

   Turn the ignition OFF and disconnect the battery ground to protect the BCM.

2. 2

   Access the Motor

   Remove the interior cab headliner or wiper motor cover panel to access the front wiper motor assembly.

3. 3

   Disconnect and Inspect

   Unplug the 5-pin connector plug from the wiper motor. Inspect the pins for pushed-out terminals or green corrosion.

4. 4

   Test the Harness

   Perform the continuity and resistance tests outlined in the diagnostic steps between the BCM harness and the wiper motor plug. Repair any broken wires.

5. 5

   Replace the Motor

   If the wiring harness, relays, and switch test good, the open circuit is internal to the wiper motor windings. Remove the wiper arm from the exterior splined/tapered output shaft. Unbolt the wiper motor bracket from the cab frame and remove the motor. Install the new OEM wiper motor and secure the mounting bolts. Reattach the wiper arm and reconnect the electrical harness.

6. 6

   Clear Codes

   Reconnect the battery, turn the ignition ON, and use a diagnostic scan tool to clear the 4057-05 BCM fault code. Test the wiper in all speed positions.