B1920 – OBD-II DTC

OBD-II DTC B1920 – Air Bag Passenger Circuit Failure

DTC B1920 meaning

DTC B1920 refers to a diagnostic trouble code indicating a failure in the airbag passenger circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle systems, including safety features like airbags. The B1920 code specifically points to an issue with the passenger airbag’s electrical circuit, which may prevent the airbag from deploying in the event of a collision.

DTC B1920 symptoms

Common symptoms associated with DTC B1920 may include:

• Illumination of the airbag warning light on the dashboard
• Passenger airbag may be disabled
• Inconsistent airbag deployment during tests
• Possible issues with the seatbelt warning system

DTC B1920 causes

Several factors can lead to the triggering of DTC B1920, including:

• Faulty passenger airbag sensor
• Damaged wiring or connectors in the airbag circuit
• Corrosion or poor connections at the airbag module
• Defective airbag control module
• Issues with the seat occupancy sensor

DTC B1920 seriousness

DTC B1920 is considered serious because it directly affects the functionality of the passenger airbag system. If the airbag is not operational, it poses a significant risk to the safety of the passenger in the event of a collision. It is crucial to address this issue promptly to ensure that all safety systems are functioning correctly.

How to diagnose DTC B1920

To diagnose DTC B1920, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1920 code.
2. Inspect the airbag system wiring and connectors for any visible damage or corrosion.
3. Check the passenger airbag sensor and seat occupancy sensor for proper operation.
4. Test the airbag control module for faults or failures.
5. Clear the code and perform a road test to see if the code reappears.

How to fix DTC B1920 step-by-step instructions

To fix DTC B1920, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on the airbag system.
2. Inspect and repair any damaged wiring or connectors in the airbag circuit.
3. Replace the faulty passenger airbag sensor or seat occupancy sensor if necessary.
4. Reconnect all connectors and ensure they are secure.
5. Reconnect the battery and use the OBD-II scanner to clear the DTC.
6. Perform a road test to verify that the airbag system is functioning correctly and that the code does not return.

How to erase DTC B1920

To erase DTC B1920, 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 of 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 turn off the ignition.

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