B1827 – Wiper Rear High Limit Input Circuit Open

The ODBII code B1827 indicates a malfunction in the rear wiper system, specifically that the high limit input circuit is open, meaning there is a break or fault in the electrical circuit that controls the rear wiper’s high-speed operation.

The severity of ODBII code B1827 is typically considered moderate.

Common Causes For: B1826 Wiper Rear High Limit Input Circuit Failure

• Faulty rear wiper motor
• Open or damaged wiring in the circuit
• Corroded or loose connectors
• Failed wiper switch
• Malfunctioning body control module (BCM)

Common misdiagnosis for B1827 Wiper Rear High Limit Input Circuit Open

• Faulty rear wiper motor
• Damaged wiring or connectors
• Malfunctioning wiper switch
• Defective body control module (BCM)
• Issues with the rear wiper relay
• Corroded or loose ground connections
• Incorrectly installed or faulty rear wiper assembly

Common Troubleshooting Steps

The OBD-II code B1827 refers to a problem with the rear wiper high limit input circuit, indicating that the circuit is open. This can be caused by various issues, including wiring problems, faulty components, or issues with the rear wiper motor itself. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Visual Inspection: **Check Wiring and Connectors: Inspect the wiring harness and connectors related to the rear wiper motor and the high limit switch. Look for any signs of damage, corrosion, or loose connections.
• **Inspect the Rear Wiper Motor: Ensure that the rear wiper motor is securely mounted and that there are no visible signs of damage.
• Check Fuses: **Inspect Fuses: Check the fuse related to the rear wiper system. If the fuse is blown, replace it and see if the code returns.
• Test the Rear Wiper Motor: **Direct Power Test: Apply direct power to the rear wiper motor to see if it operates. If it does not work, the motor may be faulty and needs replacement.
• **Check Ground: Ensure that the motor has a good ground connection.
• Check the High Limit Switch: **Test the Switch: If the vehicle is equipped with a high limit switch, test it for continuity. If the switch is open when it should be closed, it may need to be replaced.
• Scan for Additional Codes: **Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Inspect the Body Control Module (BCM): **Check BCM Functionality: The BCM controls various electrical functions, including the rear wiper. If the BCM is malfunctioning, it may need to be reprogrammed or replaced.
• Perform a Wiring Diagram Check: **Refer to Wiring Diagrams: Consult the vehicle’s service manual for wiring diagrams to trace the circuit and identify any potential breaks or shorts.
• Clear the Code and Test Drive: **Clear the Code: After performing any repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult a Professional: If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1827 code.