B1399 – Driver Power Window One Touch Window Relay Circuit Open
The ODBII code B1399 indicates a malfunction in the driver power window one-touch window relay circuit, specifically that the circuit is open, which means there is a break or fault preventing proper operation of the one-touch feature for the driver’s power window.
The severity of ODBII code B1399 is generally considered moderate.
Common Causes For: B1398 Driver Power Window One Touch Window Relay Circuit Failure
- Faulty one-touch window relay
- Open or shorted wiring in the relay circuit
- Bad connection or corroded terminals
- Faulty power window switch
- Malfunctioning body control module (BCM)
- Blown fuse related to the power window system
- Ground connection issues
Common misdiagnosis for B1399 Driver Power Window One Touch Window Relay Circuit Open
- Faulty window switch
- Defective power window motor
- Wiring issues or shorts in the harness
- Malfunctioning body control module (BCM)
- Incorrectly installed or damaged window regulator
- Battery or charging system problems
- Faulty relay or fuse related to the power window system
Common Troubleshooting Steps
When dealing with OBD-II code B1399, which indicates a problem with the “Driver Power Window One Touch Window Relay Circuit Open,” 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: Ensure the battery is fully charged and in good condition. A weak battery can cause various electrical issues.
- Inspect Fuses: Locate the fuse box and check for any blown fuses related to the power windows or the one-touch window feature. Replace any blown fuses.
- Examine Wiring and Connectors: Inspect the wiring harness and connectors associated with the power window system. Look for signs of damage, corrosion, or loose connections.
- Pay special attention to the wiring leading to the driver’s side window switch and the relay.
- Test the One-Touch Window Switch: Use a multimeter to test the functionality of the one-touch window switch. Ensure it is providing the correct voltage and that it is not stuck or malfunctioning.
- Check the Relay: Locate the relay for the power window system and test it. You can swap it with a similar relay in the fuse box to see if the problem persists.
- If the relay is faulty, replace it.
- Inspect the Power Window Motor: Test the power window motor to ensure it is functioning correctly. If the motor is not working, it may need to be replaced.
- 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.
- Check for Ground Issues: Ensure that the ground connections for the power window system are secure and free of corrosion. A poor ground can lead to circuit issues.
- Look for Short Circuits: Inspect the circuit for any signs of short circuits that could be causing the relay circuit to open.
- Consult Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any potential issues.1
- Perform a System Reset: Sometimes, resetting the vehicle’s computer can clear temporary faults. Disconnect the battery for a few minutes and reconnect it.1
- Professional Diagnosis: If the issue persists after performing these steps, consider seeking help from a professional mechanic or an automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and potentially resolve the issue related to the B1399 code. Always ensure safety precautions are taken when working with electrical systems in vehicles.