B1822 – Wiper Rear Park Sense Input Circuit Failure

The ODBII code B1822 indicates a malfunction in the rear wiper park sense input circuit, which may affect the proper operation of the rear wiper system.

The severity of ODBII code B1822 is generally considered moderate.

Common Causes For: B1821 Wiper Rear Motor Up Relay Coil Circuit Short To Ground

• Faulty rear wiper motor
• Damaged wiring or connectors
• Short circuit in the circuit
• Corroded terminals
• Failed wiper switch
• Malfunctioning Body Control Module (BCM)
• Poor ground connection

Common misdiagnosis for B1822 Wiper Rear Park Sense Input Circuit Failure

• Faulty rear wiper motor
• Bad wiper switch
• Wiring issues or shorts in the harness
• Faulty body control module (BCM)
• Incorrectly diagnosed as a problem with the front wipers
• Misinterpretation of related codes or symptoms
• Issues with the rear window defroster circuit
• Problems with the vehicle’s electrical system or battery.

Common Troubleshooting Steps

The OBD-II code B1822 refers to a “Wiper Rear Park Sense Input Circuit Failure.” This code typically indicates an issue with the rear wiper system, specifically related to the park sense input 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 related to the rear wiper system and the B1822 code. This can provide insights into the wiring diagrams and component locations.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors associated with the rear wiper motor and park sense input circuit for any signs of damage, corrosion, or loose connections.
• **Connector Condition: Ensure that all connectors are securely attached and free of dirt or moisture.
• Test the Rear Wiper Motor: **Functionality Test: Activate the rear wiper to see if it operates correctly. If it does not work, the motor may be faulty.
• **Voltage Test: Use a multimeter to check for voltage at the rear wiper motor connector when the wiper is activated. If there is no voltage, the issue may be upstream in the circuit.
• Check the Park Switch: The park switch is responsible for signaling the wiper motor to return to the park position. Test the switch for continuity and proper operation.
• Inspect the Wiper Control Module: If your vehicle is equipped with a wiper control module, check for any faults or issues within the module. This may require specialized diagnostic equipment.
• Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Clear the Code and Test Drive: After performing any repairs or adjustments, 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 the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model.
• Check for Technical Service Bulletins (TSBs): Look for any TSBs related to the rear wiper system for your vehicle. Manufacturers sometimes release TSBs for known issues that can provide guidance on repairs. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1822 code. Always ensure safety precautions are taken when working on vehicle electrical systems.