B1398 – OBD-II DTC

OBD-II DTC B1398 – Driver Power Window One Touch Window Relay Circuit Failure

DTC B1398 meaning

DTC B1398 refers to a failure in the Driver Power Window One Touch Window Relay Circuit. This code indicates that the vehicle’s onboard diagnostic system has detected an issue with the relay responsible for the one-touch window operation, which allows the driver to open or close the window with a single press of the switch.

DTC B1398 symptoms

Common symptoms associated with DTC B1398 may include:

• Power window not responding to one-touch operation
• Power window operates only manually
• Intermittent window operation
• Window may not close or open completely
• Other electrical issues in the vehicle

DTC B1398 causes

The causes of DTC B1398 can vary, but typical reasons include:

• Faulty one-touch window relay
• Wiring issues, such as shorts or open circuits
• Defective power window switch
• Corroded or loose electrical connections
• Faulty body control module (BCM)

DTC B1398 seriousness

DTC B1398 is considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can lead to inconvenience and potential safety concerns if the windows do not operate correctly. It is advisable to address this code promptly to ensure proper window functionality.

How to diagnose DTC B1398

To diagnose DTC B1398, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the power window switch for any visible damage or wear.
3. Check the one-touch window relay for proper operation.
4. Examine the wiring and connectors for signs of corrosion or damage.
5. Test the body control module for faults.
6. Clear the DTC and perform a function test to see if the code returns.

How to fix DTC B1398 step-by-step instructions

To fix DTC B1398, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and replace the one-touch window relay if faulty.
3. Repair or replace any damaged wiring or connectors.
4. Test and replace the power window switch if necessary.
5. Check the body control module and replace it if it is defective.
6. Reconnect the battery and clear the DTC using an OBD-II scanner.
7. Test the power window operation to ensure the issue is resolved.

How to erase DTC B1398

To erase DTC B1398, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the DTC menu on the scanner.
4. Select the option to clear or erase the codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and perform a test drive to ensure the code does not return.

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