B1446 – Wiper Park Sense Circuit Failure

The ODBII code B1446 indicates a malfunction in the wiper park sense circuit, which is responsible for detecting the position of the windshield wipers when they are in the parked position.

The severity of ODBII code B1446 is generally considered moderate.

Common Causes For: B1445 Door Handle Switch Circuit Short To Ground

• Faulty wiper motor
• Damaged wiring or connectors
• Failed wiper park switch
• Malfunctioning body control module (BCM)
• Corroded terminals
• Short circuit in the wiper circuit
• Poor ground connection

Common misdiagnosis for B1446 Wiper Park Sense Circuit Failure

• Faulty windshield wiper motor
• Bad wiper switch
• Wiring issues or shorts in the harness
• Malfunctioning body control module (BCM)
• Incorrectly installed or damaged wiper linkage
• Issues with the wiper relay
• Problems with the fuse related to the wiper system

Common Troubleshooting Steps

The OBD-II code B1446 indicates a “Wiper Park Sense Circuit Failure.” This code is typically associated with issues in the windshield wiper system, particularly related to the wiper park position sensor or the circuit that monitors it. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context for the issue.
• Inspect the Wiper System:
• **Wiper Motor: Ensure that the wiper motor is functioning properly. Test the motor by activating the wipers and observing their operation.
• **Wiper Linkage: Check the wiper linkage for any signs of damage or disconnection. Ensure that the wipers are properly attached to the motor.
• Examine the Wiper Park Position Sensor:
• Locate the wiper park position sensor (if applicable) and inspect it for any physical damage or disconnection.
• Test the sensor for proper operation using a multimeter. Check for continuity and proper voltage as specified in the vehicle’s service manual.
• Inspect Wiring and Connectors:
• Check the wiring harness and connectors associated with the wiper system for any signs of wear, corrosion, or damage.
• Ensure that all connections are secure and free of dirt or moisture.
• Test the Wiper Control Module: If your vehicle is equipped with a wiper control module, it may need to be tested for proper operation. This may require specialized diagnostic equipment.
• Check for Ground Issues: Ensure that the wiper system has a good ground connection. A poor ground can lead to erratic behavior and trigger fault codes.
• Clear the Code: After performing the above checks and repairs, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult the Service Manual: If the issue persists, refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the wiper system.
• Seek Professional Help: If you are unable to diagnose or fix the issue, consider taking the vehicle to a qualified mechanic or dealership for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1446 code.