B1426 – OBD-II DTC

OBD-II DTC B1426 – Lamp Seat Belt Circuit Short To Battery

DTC B1426 meaning

DTC B1426 refers to a diagnostic trouble code indicating a short circuit in the seat belt lamp circuit, specifically a short to battery. This code is generated when the vehicle’s onboard diagnostic system detects that the seat belt warning lamp circuit is receiving an unexpected voltage level, suggesting a potential fault in the wiring or components associated with the seat belt system.

DTC B1426 symptoms

Common symptoms associated with DTC B1426 may include:

• The seat belt warning light remains illuminated.
• Inconsistent operation of the seat belt warning system.
• Possible issues with other related warning lights on the dashboard.
• In some cases, the vehicle may not allow the ignition to start if it detects a fault in the seat belt system.

DTC B1426 causes

Several factors can lead to the triggering of DTC B1426, including:

• A short circuit in the wiring harness connected to the seat belt lamp.
• Faulty seat belt switch or connector.
• Damaged or corroded connectors in the seat belt circuit.
• Issues with the body control module (BCM) that manages the seat belt warning system.

DTC B1426 seriousness

DTC B1426 is considered a moderate issue. While it may not immediately affect the vehicle’s drivability, it can compromise safety features related to the seat belt system. Ignoring this code may lead to further electrical issues or potential failure of the seat belt warning system, which is crucial for passenger safety.

How to diagnose DTC B1426

To diagnose DTC B1426, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B1426.
2. Inspect the wiring and connectors associated with the seat belt lamp circuit for any visible damage or corrosion.
3. Check the seat belt switch for proper operation and continuity.
4. Test the voltage at the seat belt lamp circuit to determine if it is receiving an appropriate voltage level.
5. Examine the body control module for any faults or issues that may affect the seat belt system.

How to fix DTC B1426 step-by-step instructions

To fix DTC B1426, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect the wiring harness for any signs of damage, fraying, or corrosion, and repair or replace as necessary.
3. Check the seat belt switch and connectors for proper operation replace any faulty components.
4. Test the seat belt lamp circuit for continuity and proper voltage, making repairs as needed.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Perform a test drive to ensure the issue is resolved and the warning light does not reappear.