B1451 – Wiper Wash/Delay Switch Circuit Open

The ODBII code B1451 indicates that there is an open circuit in the wiper wash/delay switch, meaning the switch is not functioning properly or is disconnected.

The severity of ODBII code B1451 is generally considered moderate.

Common Causes For: B1450 Wiper Wash/Delay Switch Circuit Failure

• Faulty wiper wash/delay switch
• Damaged wiring or connectors
• Corroded terminals
• Short circuit in the wiring harness
• Faulty body control module (BCM)
• Poor ground connection
• Blown fuse related to the wiper system

Common misdiagnosis for B1451 Wiper Wash/Delay Switch Circuit Open

• Faulty wiper motor
• Bad wiper relay
• Defective body control module (BCM)
• Wiring issues or shorts in the harness
• Malfunctioning windshield washer pump
• Faulty wiper switch
• Corroded connectors or terminals

Common Troubleshooting Steps

The OBD-II code B1451 indicates a problem with the Wiper Wash/Delay Switch Circuit, specifically that there is an open circuit. Here are some common troubleshooting steps to diagnose and potentially resolve this issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information about the wiper wash/delay switch circuit, including wiring diagrams and component locations.
• Visual Inspection:
• Inspect the wiper wash/delay switch for any visible damage or wear.
• Check the wiring harness and connectors associated with the wiper system for signs of fraying, corrosion, or disconnection.
• Look for any blown fuses related to the wiper system.
• Test the Wiper Wash/Delay Switch:
• Use a multimeter to test the continuity of the switch. If the switch is faulty, it may need to be replaced.
• Check for proper voltage at the switch when the wiper system is activated.
• Inspect the Wiring:
• Trace the wiring from the wiper wash/delay switch to the Body Control Module (BCM) or the relevant control module.
• Look for any breaks, shorts, or open circuits in the wiring.
• Check the Ground Connections:
• Ensure that all ground connections related to the wiper system are secure and free of corrosion.
• A poor ground can cause various electrical issues, including open circuit codes.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue.
• Test the Body Control Module (BCM):
• If all other components and wiring are functioning correctly, the issue may lie within the BCM. Testing or reprogramming the BCM may be necessary.
• Clear the Code and Test Drive:
• After performing repairs or replacements, 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 steps, you should be able to identify and resolve the issue related to the B1451 code.