B1398 – Driver Power Window One Touch Window Relay Circuit Failure

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The ODBII 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.

The severity of ODBII code B1398 is generally considered moderate.

Common Causes For: B1397 Power Door Unlock Circuit Short To Battery

  • 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 misdiagnosis for B1398 Driver Power Window One Touch Window Relay Circuit Failure

  • 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

Common Troubleshooting Steps

When dealing with OBD-II code B1398, which indicates a “Driver Power Window One Touch Window Relay Circuit Failure,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

  • Check the Vehicle’s Battery and Charging System: Ensure the battery is fully charged and in good condition.
  • Check the alternator and charging system to ensure they are functioning properly.
  • 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.
  • Inspect the relay associated with the power window system. If it’s faulty, replace it.
  • 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.
  • Pay special attention to the wiring that may be pinched or frayed.
  • Test the Power Window Switch: Use a multimeter to test the power window switch for continuity and proper operation.
  • If the switch is faulty, it may need to be replaced.
  • 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.
  • If the motor works when powered directly, the issue may lie in the control circuit.
  • 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.
  • 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.
  • Some vehicles may require a reset procedure for the one-touch feature after a battery disconnect or replacement.
  • 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.
  • 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.
  • 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.

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