WOMS
B code body Medium severity

B1401 Driver Power Window One Touch Window Relay Circuit Short To Ground

The OBD2 code B1401 indicates a short circuit to ground in the one-touch window relay circuit for the driver's power window, which may prevent the window from operating correctly

Definition

The OBD2 code B1401 indicates a short circuit to ground in the one-touch window relay circuit for the driver's power window, which may prevent the window from operating correctly

Common causes

  • Shorted wiring or connectors in the power window circuit
  • Faulty one-touch window relay
  • Defective power window switch
  • Grounding issues in the circuit
  • Damaged or frayed wires

Common misdiagnoses

  • Faulty window switch
  • Defective power window motor
  • Wiring harness issues
  • Malfunctioning body control module (BCM)
  • Incorrectly installed or damaged window regulator
  • Shorted or damaged wiring in the door harness
  • Faulty relay or fuse related to the power window system

Troubleshooting steps

  1. 1. Verify the Code

    Use an OBD-II scanner to confirm the presence of the B1401 code

  2. 2. Check for any additional codes that may provide more context or related issues

  3. 3. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the driver power window circuit for any signs of damage, fraying, or corrosion

  4. 4. Ground Connections

    Ensure that all ground connections are secure and free of corrosion

  5. 5. Check the One Touch Window Relay

    Locate the one-touch window relay in the vehicle’s fuse box or relay panel

  6. 6. Inspect the relay for any signs of damage or malfunction

  7. 7. If possible, swap the relay with a known good one to see if the issue persists

  8. 8. Test the Power Window Switch

    Remove the power window switch and inspect it for damage or wear

  9. 9. Use a multimeter to test the switch for continuity and proper operation

  10. 10. If the switch is faulty, replace it

  11. 11. Check for Short Circuits

    Use a multimeter to check for continuity between the relay circuit and ground. A short to ground will show continuity where it shouldn’t

  12. 12. Trace the wiring back to find any points where the insulation may be damaged, causing a short

  13. 13. Inspect the Power Window Motor

    If the wiring and relay are in good condition, check the power window motor itself

  14. 14. Test the motor by applying direct power to see if it operates. If it doesn’t, the motor may need to be replaced

  15. 15. Check the Body Control Module (BCM)

    If all other components are functioning correctly, the issue may lie within the BCM

  16. 16. Inspect the BCM for any signs of damage or failure

  17. 17. If necessary, reprogram or replace the BCM

  18. 18. Clear the Code and Test Drive

    After performing the necessary repairs, clear the code using the OBD-II scanner

  19. 19. Take the vehicle for a test drive to see if the code returns

  20. 20. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis.Additional Tips: - Always refer to the vehicle’s service manual for specific wiring diagrams and component locations. - Ensure that you have the proper tools and safety equipment when working on electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1401 code