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B1935Air Bag Passenger Inflator Circuit Resistance Low on Squib

The OBD2 code B1935 indicates that there is low resistance in the passenger airbag inflator circuit, which may suggest a fault in the squib (the device that ignites the airbag) or its wiring, potentially affecting the...

Definition

The OBD2 code B1935 indicates that there is low resistance in the passenger airbag inflator circuit, which may suggest a fault in the squib (the device that ignites the airbag) or its wiring, potentially affecting the airbag's deployment

Common causes

  • Faulty passenger airbag inflator
  • Damaged or corroded wiring or connectors
  • Short circuit in the squib circuit
  • Open circuit in the squib circuit
  • Faulty airbag control module
  • Poor ground connection
  • Incorrectly installed airbag module

Common misdiagnoses

  • Faulty airbag module
  • Damaged wiring or connectors
  • Defective passenger airbag
  • Faulty seat occupancy sensor
  • Incorrectly installed airbag system components
  • Low battery voltage
  • Faulty diagnostic tool readings

Troubleshooting steps

  1. 1.Safety First

  2. 2.Disconnect the vehicle's battery, specifically the negative terminal, to prevent accidental airbag deployment while working on the system

  3. 3.Visual Inspection

  4. 4.Inspect the airbag module and wiring harness for any visible damage, such as frayed wires, corrosion, or loose connections

  5. 5.Check the connectors for the passenger airbag module to ensure they are securely connected and free of dirt or moisture

  6. 6.Check Resistance

  7. 7.Use a multimeter to measure the resistance of the airbag squib circuit. The resistance should typically be within the manufacturer's specified range (usually around 2 to 3 ohms). If the resistance is significantly lower, it indicates a short circuit

  8. 8.Inspect the Airbag Module

  9. 9.If the resistance is low, the airbag module itself may be faulty. Consider replacing the airbag module if other components check out

  10. 10.Check for Short Circuits

  11. 11.Inspect the wiring harness for any signs of short circuits. Look for pinched wires or areas where the insulation may have worn away, causing a short to ground

  12. 12.Test the Airbag Connector

  13. 13.Disconnect the airbag connector and check the resistance again. If the resistance returns to normal, the issue may be with the airbag module. If it remains low, the problem lies within the wiring harness

  14. 14.Scan for Additional Codes

  15. 15.Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  16. 16.Check Ground Connections

  17. 17.Ensure that all ground connections related to the airbag system are clean and secure. Poor ground connections can lead to erroneous readings

  18. 18.Refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the airbag system

  19. 19.Clear Codes and Test Drive

  20. 20.After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns. 1

  21. 21.Professional Help

  22. 22.If the issue persists after following these steps, consider seeking assistance from a professional technician or an automotive specialist with experience in airbag systems. Always remember that working with airbag systems can be dangerous. If you're not comfortable performing these steps, it's best to consult a professional