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B1401 – OBD-II DTC

OBD-II DTC B1401 – Driver Power Window One Touch Window Relay Circuit Short To Ground

DTC B1401 meaning

DTC B1401 refers to a diagnostic trouble code indicating a problem with the driver power window one-touch window relay circuit. Specifically, it signifies that there is a short to ground in the relay circuit, which can prevent the one-touch window feature from functioning properly.

DTC B1401 symptoms

Common symptoms associated with DTC B1401 may include:

  • Driver’s power window not responding to one-touch operation.
  • Power window may operate intermittently or not at all.
  • Possible warning lights on the dashboard related to the power window system.
  • Inconsistent behavior of the power window switch.

DTC B1401 causes

Several factors can lead to the occurrence of DTC B1401, including:

  • A short circuit in the wiring of the one-touch window relay.
  • Faulty one-touch window relay itself.
  • Damaged or corroded connectors in the power window circuit.
  • Issues with the power window switch.
  • Malfunctioning body control module (BCM) that manages the power window functions.

DTC B1401 seriousness

The seriousness of DTC B1401 can vary. While it may not pose an immediate safety risk, it can lead to inconvenience due to the malfunctioning power window. If left unaddressed, it may indicate underlying electrical issues that could affect other systems in the vehicle.

How to diagnose DTC B1401

To diagnose DTC B1401, follow these steps:

  1. Use an OBD-II scanner to confirm the presence of DTC B1401.
  2. Inspect the wiring and connectors related to the one-touch window relay for any visible damage or corrosion.
  3. Test the one-touch window relay for proper operation using a multimeter.
  4. Check the power window switch for functionality.
  5. Examine the body control module for any faults or issues.

How to fix DTC B1401 step-by-step instructions

To fix DTC B1401, follow these steps:

  1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
  2. Inspect and repair any damaged wiring or connectors found during diagnosis.
  3. Replace the faulty one-touch window relay if it is determined to be defective.
  4. Test the power window switch and replace it if necessary.
  5. Reconnect the battery and clear the DTC using an OBD-II scanner.
  6. Test the one-touch window feature to ensure it operates correctly.

How to erase DTC B1401

To erase DTC B1401, 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 option to clear or erase trouble codes on the scanner.
  4. Confirm the action to erase DTC B1401.
  5. Disconnect the scanner and start the vehicle to check if the code reappears.

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