WOMS
B code body Medium severity

B1404 Driver Power Window Down Circuit Open

The OBD2 code B1404 indicates that there is an open circuit in the driver power window down circuit, meaning the system is unable to complete the electrical path needed to operate the driver's side window in the...

Definition

The OBD2 code B1404 indicates that there is an open circuit in the driver power window down circuit, meaning the system is unable to complete the electrical path needed to operate the driver's side window in the downward direction

Common causes

  • Faulty power window switch
  • Damaged wiring or connectors
  • Blown fuse
  • Malfunctioning power window motor
  • Faulty body control module (BCM)
  • Poor ground connection

Common misdiagnoses

  • Faulty power window switch
  • Defective window motor
  • Wiring issues or shorts
  • Blown fuse
  • Body control module (BCM) failure
  • Incorrectly installed window regulator
  • Ground connection problems
  • Faulty relay
  • Misinterpretation of other related codes
  • Battery or charging system issues

Troubleshooting steps

  1. 1. Check the Fuse:

    Locate the fuse box and check the fuse associated with the power windows. If the fuse is blown, replace it and see if the issue persists

  2. 2. Inspect Wiring and Connectors:

    Visually inspect the wiring and connectors related to the driver’s power window switch and motor. Look for any signs of damage, corrosion, or loose connections

  3. 3. Test the Power Window Switch:

    Use a multimeter to test the power window switch for continuity. If the switch is faulty, it may need to be replaced

  4. 4. Check the Power Window Motor:

    Test the power window motor by applying direct power to it. If the motor does not operate, it may be defective and require replacement

  5. 5. Examine the Window Regulator:

    Inspect the window regulator for any mechanical issues that may prevent the window from moving. If the regulator is damaged, it may need to be replaced

  6. 6. Check for Ground Issues:

    Ensure that the ground connections for the power window circuit are secure and free of corrosion. A poor ground can cause circuit issues

  7. 7. 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

  8. 8. Inspect the Body Control Module (BCM):

    If all other components check out, the issue may lie within the BCM. Check for any software updates or faults in the module

  9. 9. Perform a Visual Inspection:

    Look for any signs of water intrusion or damage in the door panel that could affect the electrical components

  10. 10. Consult Wiring Diagrams

  11. 11. Refer to the vehicle’s wiring diagrams to trace the circuit and identify any potential breaks or shorts in the wiring. 1

  12. 12. Professional Diagnosis

  13. 13. If the issue persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify the cause of the B1404 code and take appropriate action to resolve the issue