B1450 – Wiper Wash/Delay Switch Circuit Failure

The ODBII code B1450 indicates a malfunction in the wiper wash/delay switch circuit, which may affect the operation of the windshield wipers and washer system.

The severity of ODBII code B1450 is generally considered moderate.

Common Causes For: B1449 Wiper Park Sense Circuit Short To Ground

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

Common misdiagnosis for B1450 Wiper Wash/Delay Switch Circuit Failure

• Faulty windshield wiper motor
• Bad wiper relay
• Defective body control module (BCM)
• Wiring issues or shorts in the harness
• Malfunctioning wiper switch
• Low washer fluid level sensor failure
• Faulty fuse related to wiper system

Common Troubleshooting Steps

The OBD-II code B1450 indicates a problem with the wiper wash/delay switch circuit. This code can be triggered by various issues, including electrical faults, component failures, or wiring problems. 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 related to the wiper wash/delay switch circuit. This can provide insights into the wiring diagrams and component locations.
• Visual Inspection: Inspect the wiper wash/delay switch and its wiring for any visible damage, such as frayed wires, corrosion, or loose connections.
• Check the connectors for signs of wear or damage.
• Test the Wiper Wash/Delay Switch: Use a multimeter to test the switch for continuity. Ensure that the switch operates correctly in all positions.
• If the switch is faulty, it may need to be replaced.
• Check Fuses: Inspect the fuses related to the wiper system. A blown fuse can cause the circuit to fail.
• Replace any blown fuses and retest the system.
• Inspect the Wiper Motor: Check the wiper motor for proper operation. If the motor is malfunctioning, it may not respond to the switch inputs.
• Test the motor by applying direct power to see if it operates.
• Examine the Wiring Harness: Follow the wiring from the switch to the wiper motor and check for any breaks, shorts, or poor connections.
• Repair or replace any damaged wiring as necessary.
• Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context for the issue.
• Address any other codes that may be related to the wiper system.
• Check Ground Connections: Ensure that all ground connections related to the wiper system are secure and free of corrosion.
• A poor ground can lead to circuit failures.
• Test the Body Control Module (BCM): If all other components check out, the issue may lie within the BCM, which controls the wiper system.
• Consult the vehicle’s service manual for testing procedures for the BCM.
• Clear Codes and Test Drive: After performing repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears.1
• Consult a Professional: If the issue persists after following these steps, it may be best to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1450 code.