B1409 – OBD-II DTC

OBD-II DTC B1409 – Driver Power Window Up Circuit Short To Ground

DTC B1409 meaning

DTC B1409 refers to a diagnostic trouble code indicating a short circuit to ground in the driver power window up circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle systems for faults. When the power window switch is activated to raise the window, the system detects an unexpected low resistance path to ground, triggering this code.

DTC B1409 symptoms

Common symptoms associated with DTC B1409 may include:

• Power window not functioning properly or being inoperative.
• Window may only operate in one direction (down but not up).
• Intermittent operation of the power window.
• Possible blown fuses related to the power window circuit.
• Warning lights on the dashboard, particularly related to electrical issues.

DTC B1409 causes

Several factors can lead to the occurrence of DTC B1409, including:

• Damaged wiring or connectors in the power window circuit.
• Faulty power window switch.
• Short circuit in the window motor.
• Corrosion or poor connections in the electrical system.
• Malfunctioning body control module (BCM) or power window relay.

DTC B1409 seriousness

DTC B1409 can be considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can lead to safety concerns if the power windows are inoperative. Additionally, unresolved electrical issues can lead to further complications in the vehicle’s electrical system.

How to diagnose DTC B1409

To diagnose DTC B1409, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1409 code.
2. Inspect the power window circuit wiring and connectors for damage or corrosion.
3. Check the power window switch for proper operation.
4. Test the power window motor for shorts or failures.
5. Examine the body control module and related components for faults.
6. Perform continuity tests on the circuit to identify any shorts to ground.

How to fix DTC B1409 step-by-step instructions

To fix DTC B1409, 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 in the power window circuit.
3. Replace the power window switch if it is found to be faulty.
4. Test and replace the power window motor if necessary.
5. Check and replace any blown fuses related to the power window system.
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 B1409

To erase DTC B1409, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the trouble codes section 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 start the vehicle to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.