B1406 – OBD-II DTC

OBD-II DTC B1406 – Driver Power Window Down Circuit Short To Ground

DTC B1406 meaning

DTC B1406 refers to a diagnostic trouble code indicating a short circuit to ground in the driver power window down circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components and systems for faults. When the power window system detects an abnormal condition, such as a short circuit, it triggers this code to alert the technician of the issue.

DTC B1406 symptoms

Common symptoms associated with DTC B1406 may include:

• Power window not functioning properly
• Driver’s side window may not go down
• Window may operate intermittently
• Possible blown fuses related to the power window system
• Warning lights on the dashboard

DTC B1406 causes

Several factors can lead to the triggering of DTC B1406, including:

• Damaged wiring or connectors in the power window circuit
• Faulty power window switch
• Short circuit in the window motor
• Moisture or corrosion in electrical connections
• Faulty body control module (BCM)

DTC B1406 seriousness

DTC B1406 is considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can lead to safety concerns if the driver is unable to operate the window. Additionally, unresolved electrical issues can lead to further damage in the power window system or other related components.

How to diagnose DTC B1406

To diagnose DTC B1406, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1406 code.
2. Inspect the power window wiring and connectors for any visible damage or corrosion.
3. Check the power window switch for proper operation.
4. Test the power window motor for continuity and functionality.
5. Examine the body control module for any faults or issues.
6. Clear the code and perform a test drive to see if the code reappears.

How to fix DTC B1406 step-by-step instructions

To fix DTC B1406, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
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 clean any corroded connections, especially in the BCM.
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 B1406

To erase DTC B1406, 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 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 perform a test drive to ensure the code does not reappear.

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