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B codebodyMedium severity

B1826Wiper Rear High Limit Input Circuit Failure

The OBD2 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

Definition

The OBD2 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

Common causes

  • 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 misdiagnoses

  • 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

Troubleshooting steps

  1. 1.Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information regarding the rear wiper system and wiring diagrams

  2. 2.Inspect the Rear Wiper Motor

    Check the rear wiper motor for any signs of damage or wear

  3. 3.Ensure that the motor is properly connected and that there are no loose or corroded connections

  4. 4.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

  5. 5.Look for any broken wires or poor connections that could affect the circuit

  6. 6.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

  7. 7.If the switch is faulty, it may need to be replaced

  8. 8.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

  9. 9.Swap the relay with a similar one (if available) to see if the problem persists

  10. 10.Inspect the Fuse

    Check the fuse associated with the rear wiper system. A blown fuse can lead to circuit failures

  11. 11.Replace any blown fuses and retest the system

  12. 12.Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue

  13. 13.Address any other codes that may be present

  14. 14.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

  15. 15.Perform a Visual Inspection

    Look for any obstructions or physical damage to the rear wiper arm or blade that could affect its operation

  16. 16.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

  17. 17.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