WOMS
B code body Medium severity

B1422 Power Window RR Motor Circuit Failure

The OBD2 code B1422 indicates a failure in the power window motor circuit for the right rear window, suggesting a malfunction in the motor or its associated wiring and connections

Definition

The OBD2 code B1422 indicates a failure in the power window motor circuit for the right rear window, suggesting a malfunction in the motor or its associated wiring and connections

Common causes

  • Faulty power window motor
  • Damaged wiring or connectors
  • Blown fuse
  • Faulty window switch
  • Short circuit in the circuit
  • Corroded connections
  • Malfunctioning body control module (BCM)

Common misdiagnoses

  • Faulty power window switch
  • Wiring issues or shorts in the harness
  • Defective window regulator
  • Battery or charging system problems
  • Body control module (BCM) failure
  • Faulty relay or fuse
  • Incorrectly diagnosed motor issues

Troubleshooting steps

  1. 1. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors leading to the rear right power window motor for any signs of damage, corrosion, or loose connections

  2. 2. Look for Obstructions

    Ensure that there are no physical obstructions in the window track that could prevent the window from operating

  3. 3. Check the Power Window Switch

    Test the Switch: Use a multimeter to test the power window switch for continuity. If the switch is faulty, it may not send the correct signal to the motor

  4. 4. Bypass the Switch

    If possible, bypass the switch to see if the motor operates directly. This can help determine if the switch is the issue

  5. 5. Test the Power Window Motor

    Direct Power Test: Apply direct power to the motor using a known good power source to see if the motor operates. If it does not, the motor may be faulty and need replacement

  6. 6. Check Ground Connection

    Ensure that the ground connection for the motor is secure and free of corrosion

  7. 7. Inspect the Circuit

    Check Fuses: Inspect the fuse related to the power window circuit. Replace any blown fuses

  8. 8. Test Voltage

    Use a multimeter to check for voltage at the motor connector when the switch is activated. If there is no voltage, trace the circuit back to find the issue

  9. 9. Scan for Additional Codes

    Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  10. 10. Check for Ground Issues

    Ground Points: Ensure that all ground points related to the power window system are clean and secure. Poor grounding can lead to circuit failures

  11. 11. Inspect the Body Control Module (BCM)

    BCM Functionality: If all other components check out, the issue may lie within the Body Control Module. Check for any software updates or faults in the BCM

  12. 12. Consult Wiring Diagrams

    Refer to Service Manual: Use the vehicle’s service manual to refer to wiring diagrams for the power window system. This can help identify any potential issues in the circuit

  13. 13. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who can perform more advanced diagnostics.Conclusion By following these troubleshooting steps, you should be able to identify the cause of the B1422 code and take appropriate action to resolve the issue with the rear right power window motor circuit