B1823 – Wiper Rear Park Sense Input Circuit Open

The ODBII code B1823 indicates an open circuit in the rear wiper park sense input, meaning the vehicle’s system is not receiving the expected signal from the rear wiper’s park position sensor.

The severity of ODBII code B1823 is moderate.

Common Causes For: B1822 Wiper Rear Park Sense Input Circuit Failure

• Open circuit in the wiring harness
• Faulty rear wiper motor
• Defective wiper park switch
• Poor ground connection
• Damaged connectors or terminals
• Faulty body control module (BCM)

Common misdiagnosis for B1823 Wiper Rear Park Sense Input Circuit Open

• Faulty rear wiper motor
• Bad wiper switch
• Damaged wiring or connectors
• Malfunctioning body control module (BCM)
• Incorrectly installed or defective rear wiper relay
• Issues with the main wiring harness
• Faulty ground connection

Common Troubleshooting Steps

The OBD-II code B1823 refers to a problem with the rear wiper park sense input circuit, indicating that there is an open circuit or a fault in the system. 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 regarding the rear wiper system and the B1823 code. This can provide insights into the wiring diagrams and component locations.
• Visual Inspection:
• Inspect the wiring harness and connectors related to the rear wiper system for any signs of damage, corrosion, or loose connections.
• Look for frayed wires, broken connectors, or any signs of wear that could lead to an open circuit.
• Check the Rear Wiper Motor:
• Test the rear wiper motor to ensure it is functioning correctly. If the motor is faulty, it may not send the proper signals to the control module.
• Use a multimeter to check for continuity in the motor circuit.
• Inspect the Park Switch:
• The park switch is responsible for signaling the wiper control module when the wiper is in the parked position. Check the switch for proper operation and continuity.
• If the switch is faulty, it may need to be replaced.
• Test the Control Module:
• If the wiring and components appear to be in good condition, the issue may lie with the wiper control module itself. Use a scan tool to check for any additional codes or data related to the wiper system.
• If necessary, test the control module for proper operation and replace it if it is found to be defective.
• Check for Ground Issues:
• Ensure that the ground connections for the rear wiper system are secure and free of corrosion. A poor ground can lead to circuit issues.
• Clear the Code and Test Drive:
• After performing the above checks and repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code reappears.
• Consult a Professional:
• If the issue persists after performing these troubleshooting 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 B1823 code.