B1826 – Wiper Rear High Limit Input Circuit Failure

The ODBII code B1826 indicates a malfunction in the rear wiper high limit input circuit, suggesting that the system is not receiving the expected signal when the rear wiper is in the high-speed position.

The severity of ODBII code B1826 is generally considered moderate.

Common Causes For: B1825 Wiper Rear Park Sense Input Circuit Short To Ground

• Faulty rear wiper motor
• Damaged wiring or connectors in the rear wiper circuit
• Malfunctioning wiper switch
• Short circuit in the rear wiper circuit
• Corroded or loose electrical connections
• Failed body control module (BCM)
• Blown fuse related to the rear wiper system

Common misdiagnosis for B1826 Wiper Rear High Limit Input Circuit Failure

• Faulty rear wiper motor
• Defective wiper switch
• Wiring issues or shorts in the harness
• Malfunctioning body control module (BCM)
• Incorrectly diagnosed front wiper issues
• Bad ground connections
• Faulty relay or fuse related to the wiper system

Common Troubleshooting Steps

The OBD-II code B1826 refers to a “Wiper Rear High Limit Input Circuit Failure.” This code typically indicates a problem with the rear wiper system, specifically related to the high limit switch or 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 regarding the rear wiper system and wiring diagrams.
• Inspect the Rear Wiper Motor: Check the rear wiper motor for any signs of damage or wear.
• Ensure that the motor is properly connected and that there are no loose or corroded connections.
• Examine the Wiring and Connectors: Inspect the wiring harness and connectors associated with the rear wiper system for any signs of damage, fraying, or corrosion.
• Look for any broken wires or poor connections that could affect the circuit.
• Test the High Limit Switch: The high limit switch is designed to prevent the rear wiper from operating beyond its intended range. Test the switch for continuity using a multimeter.
• If the switch is faulty, it may need to be replaced.
• Check the Rear Wiper Relay: Inspect the relay that controls the rear wiper operation. A faulty relay can cause issues with the wiper’s functionality.
• Swap the relay with a similar one (if available) to see if the problem persists.
• Inspect the Fuse: Check the fuse associated with the rear wiper system. A blown fuse can lead to circuit failures.
• Replace any blown fuses and retest the system.
• Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue.
• Address any other codes that may be present.
• Test the Wiper Control Switch: The control switch on the steering column or dashboard may also be at fault. Test the switch for proper operation and continuity.
• Perform a Visual Inspection: Look for any obstructions or physical damage to the rear wiper arm or blade that could affect its operation.
• Clear the Code and Test Drive: After performing the necessary repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.1
• Consult a Professional: If the issue persists after performing these steps, it may be best to consult a professional mechanic for further diagnosis and repair. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1826 code.