B1841 – Wiper Front Power Circuit Open

The ODBII code B1841 indicates that there is an open circuit in the front power wiper system, meaning that the electrical connection for the wipers is interrupted or not functioning properly.

The severity of ODBII code B1841 is moderate.

Common Causes For: B1840 Wiper Front Power Circuit Failure

• Open circuit in the wiring harness
• Faulty wiper motor
• Bad wiper motor relay
• Corroded or loose connectors
• Blown fuse
• Faulty body control module (BCM)

Common misdiagnosis for B1841 Wiper Front Power Circuit Open

• Faulty wiper motor
• Bad wiper switch
• Damaged wiring or connectors
• Blown fuse
• Faulty body control module (BCM)
• Incorrectly diagnosed rain sensor issues
• Misinterpreted electrical shorts or opens in related circuits

Common Troubleshooting Steps

The OBD-II code B1841 indicates a problem with the front wiper power circuit, specifically that there is an open circuit. This can be caused by various issues, including wiring problems, faulty components, or issues with the wiper control module. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information about the wiper system and wiring diagrams.
• Visual Inspection:
• Inspect the wiper motor and its wiring harness for any visible damage, such as frayed wires, corrosion, or loose connections.
• Check the fuse related to the wiper system. If it is blown, replace it and see if the code returns.
• Test the Wiper Motor:
• Disconnect the wiper motor connector and use a multimeter to check for continuity in the motor. If there is no continuity, the motor may be faulty and needs replacement.
• Apply direct power to the wiper motor to see if it operates. If it does not, the motor may be defective.
• Check the Wiper Switch:
• Test the wiper switch for proper operation. A faulty switch can prevent the wipers from receiving power.
• Use a multimeter to check for continuity in the switch when it is activated.
• Inspect the Wiring:
• Follow the wiring from the wiper motor to the control module and check for any breaks or shorts in the wiring.
• Look for any signs of wear or damage that could cause an open circuit.
• Check the Ground Connection:
• Ensure that the ground connection for the wiper motor is secure and free of corrosion. A poor ground can lead to circuit issues.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context for the issue.
• Test the Wiper Control Module:
• If all other components check out, the wiper control module may be faulty. Testing or replacing the module may be necessary.
• Clear the Code:
• After performing repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult a Professional:
• If you are unable to diagnose or fix the issue, it may be best to consult a professional mechanic for further assistance. By following these steps, you should be able to identify and resolve the issue related to the B1841 code.