B1403 – OBD-II DTC

OBD-II DTC B1403 – Driver Power Window Up Switch Circuit Failure

DTC B1403 meaning

DTC B1403 refers to a fault in the Driver Power Window Up Switch Circuit. This diagnostic trouble code indicates that the power window system has detected an issue with the switch responsible for controlling the upward movement of the driver’s side window. The code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components for proper operation.

DTC B1403 symptoms

Common symptoms associated with DTC B1403 may include:

• Driver’s side power window not functioning properly.
• Window may not move up or down when the switch is activated.
• Intermittent operation of the power window.
• Other windows may operate normally while the driver’s window does not.
• Possible warning lights on the dashboard related to the power window system.

DTC B1403 causes

Several factors can lead to the occurrence of DTC B1403, including:

• Faulty driver power window switch.
• Wiring issues, such as shorts or open circuits in the switch circuit.
• Defective power window motor.
• Corrosion or poor connections in the electrical system.
• Faulty body control module (BCM) that manages the power window functions.

DTC B1403 seriousness

The seriousness of DTC B1403 can vary based on the symptoms experienced. While it may not pose an immediate safety risk, it can lead to inconvenience and potential issues with window operation. It is advisable to address this code promptly to ensure proper functionality of the power window system and to prevent further electrical problems.

How to diagnose DTC B1403

To diagnose DTC B1403, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1403 code.
2. Inspect the driver power window switch for physical damage or wear.
3. Check the wiring and connectors associated with the switch for any signs of damage or corrosion.
4. Test the power window motor to ensure it is functioning correctly.
5. Examine the body control module for any faults or issues that may affect the power window operation.
6. Clear the code and perform a function test to see if the issue reoccurs.

How to fix DTC B1403 step-by-step instructions

To fix DTC B1403, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Remove the driver power window switch from the door panel.
3. Inspect the switch for any visible damage and test it with a multimeter for continuity.
4. If the switch is faulty, replace it with a new one.
5. Check the wiring harness for any shorts, open circuits, or corrosion, and repair as necessary.
6. Test the power window motor by applying direct power to it to ensure it operates correctly.
7. If the motor is defective, replace it.
8. Reconnect all components and the battery, then clear the DTC using an OBD-II scanner.
9. Perform a function test to ensure the power window operates correctly.

How to erase DTC B1403

To erase DTC B1403, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Follow the prompts to clear the trouble code from the vehicle’s computer.
5. Disconnect the scanner and turn off the ignition.
6. Start the vehicle and check if the code reappears after a test drive.

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