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B1928 Air Bag Safing Sensor Output Circuit Failure

The OBD2 code B1928 indicates a failure in the airbag safing sensor output circuit, which is responsible for determining whether the airbag should deploy in the event of a collision

Definition

The OBD2 code B1928 indicates a failure in the airbag safing sensor output circuit, which is responsible for determining whether the airbag should deploy in the event of a collision

Common causes

  • Faulty airbag safing sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Short circuit in the circuit
  • Open circuit in the circuit
  • Corrosion in connectors
  • Faulty airbag control module
  • Software issues in the airbag system

Common misdiagnoses

  • Faulty airbag module
  • Defective airbag sensor
  • Wiring issues or shorts in the airbag system
  • Faulty seat belt pretensioner
  • Malfunctioning crash sensor
  • Issues with the airbag control unit
  • Battery or power supply problems affecting the airbag system

Troubleshooting steps

  1. 1. Scan Tool Verification

  2. 2. Use an OBD-II scanner to confirm the presence of the B1928 code. Check for any other related codes that may provide additional context

  3. 3. Visual Inspection

  4. 4. Inspect the airbag system wiring and connectors, especially those related to the safing sensor. Look for signs of damage, corrosion, or loose connections

  5. 5. Check the condition of the airbag module and any related components

  6. 6. Check the Safing Sensor

  7. 7. The safing sensor is designed to detect a collision and send a signal to deploy the airbag. Ensure that the sensor is properly mounted and not damaged

  8. 8. If possible, test the safing sensor using a multimeter to check for proper resistance and functionality

  9. 9. Inspect the Airbag Control Module

  10. 10. Check the airbag control module for any signs of damage or corrosion. Ensure that it is securely connected and that the connectors are clean and free of debris

  11. 11. Wiring Continuity and Resistance Tests

  12. 12. Perform continuity tests on the wiring between the safing sensor and the airbag control module. Look for any breaks or shorts in the wiring

  13. 13. Measure the resistance of the circuit to ensure it is within the manufacturer's specifications

  14. 14. Check for Ground Issues

  15. 15. Ensure that the safing sensor and airbag control module have a good ground connection. Poor grounding can lead to circuit failures

  16. 16. Clear Codes and Test Drive

  17. 17. After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  18. 18. Take the vehicle for a test drive to see if the code reappears

  19. 19. Consult Manufacturer Specifications

  20. 20. Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the airbag system and safing sensor

  21. 21. Professional Diagnosis

  22. 22. If the issue persists after performing the above steps, consider seeking help from a professional technician or an automotive specialist with experience in airbag systems

  23. 23. Replacement

  24. 24. If the safing sensor or airbag control module is found to be faulty, replace the component as necessary. Always remember to follow safety precautions when working with airbag systems, as they can be dangerous if mishandled. If you're unsure or uncomfortable with any step, it's best to consult a professional