WOMS
B code body Medium severity

B1398 Driver Power Window One Touch Window Relay Circuit Failure

The OBD2 code B1398 indicates a failure in the one-touch window relay circuit for the driver's power window, suggesting a malfunction in the relay or associated wiring

Definition

The OBD2 code B1398 indicates a failure in the one-touch window relay circuit for the driver's power window, suggesting a malfunction in the relay or associated wiring

Common causes

  • Faulty one-touch window switch
  • Defective window motor
  • Damaged wiring or connectors
  • Failed relay
  • Blown fuse
  • Short circuit in the circuit
  • Corrosion in electrical connections
  • Malfunctioning body control module (BCM)

Common misdiagnoses

  • Faulty window switch
  • Bad power window motor
  • Wiring issues or shorts
  • Body control module (BCM) failure
  • Incorrectly programmed or faulty key fob
  • Battery or charging system problems
  • Faulty door module or control unit

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

    Ensure the battery is fully charged and in good condition

  2. 2. Check the alternator and charging system to ensure they are functioning properly

  3. 3. Inspect Fuses and Relays

    Locate the fuse box and check for any blown fuses related to the power windows or the one-touch window feature

  4. 4. Inspect the relay associated with the power window system. If it’s faulty, replace it

  5. 5. Examine Wiring and Connectors

    Inspect the wiring harness and connectors leading to the power window switch and motor for any signs of damage, corrosion, or loose connections

  6. 6. Pay special attention to the wiring that may be pinched or frayed

  7. 7. Test the Power Window Switch

    Use a multimeter to test the power window switch for continuity and proper operation

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

  9. 9. Check the Power Window Motor

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

  10. 10. If the motor works when powered directly, the issue may lie in the control circuit

  11. 11. 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

  12. 12. Inspect the One-Touch Window Feature

    If the vehicle has a one-touch feature, ensure that the window is not obstructed and that the one-touch function is being activated correctly

  13. 13. Some vehicles may require a reset procedure for the one-touch feature after a battery disconnect or replacement

  14. 14. Check for Software Updates

    In some cases, a software update may be available for the vehicle’s body control module (BCM) that could resolve the issue

  15. 15. Consult the Vehicle’s Service Manual

    Refer to the specific service manual for your vehicle make and model for any additional troubleshooting steps or specifications

  16. 16. Seek Professional Help

    If the issue persists after performing the above steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis. By following these steps, you should be able to identify and potentially resolve the issue related to the B1398 code. Always ensure safety precautions are taken when working on electrical systems in vehicles