WOMS
B code body Medium severity

B1937 Air Bag Passenger Pressure Switch Circuit Open

The OBD2 code B1937 indicates that there is an open circuit in the passenger airbag pressure switch, which may prevent the airbag system from functioning properly

Definition

The OBD2 code B1937 indicates that there is an open circuit in the passenger airbag pressure switch, which may prevent the airbag system from functioning properly

Common causes

  • Faulty passenger airbag pressure switch
  • Open or damaged wiring in the circuit
  • Poor electrical connections or corroded terminals
  • Faulty airbag control module
  • Malfunctioning passenger seat occupancy sensor
  • Disconnected or damaged connectors in the airbag system

Common misdiagnoses

  • Faulty airbag control module
  • Defective passenger airbag
  • Wiring issues or shorts in the harness
  • Faulty seat occupancy sensor
  • Malfunctioning seat belt buckle switch
  • Incorrectly installed or damaged passenger seat
  • Software issues in the vehicle's computer system
  • Low battery voltage or electrical system problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect the Airbag System

    Visual Inspection: Check the airbag system components, including the passenger pressure switch, wiring harness, and connectors for any visible damage, corrosion, or loose connections

  3. 3. Connector Check

    Ensure that all connectors are securely attached and free of dirt or moisture

  4. 4. Test the Passenger Pressure Switch

    Switch Functionality: Use a multimeter to test the resistance of the passenger pressure switch. The switch should show continuity when the seat is occupied and open when it is not

  5. 5. Wiring Check

    Inspect the wiring leading to the switch for any breaks or shorts. Repair or replace any damaged wiring

  6. 6. Check for Ground Issues

    Ensure that the ground connections for the airbag system are secure and free of corrosion. A poor ground can cause circuit issues

  7. 7. Inspect the Seat and Occupancy Sensor

    If the vehicle is equipped with an occupancy sensor in the seat, ensure it is functioning correctly. Check for any obstructions or damage to the sensor

  8. 8. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns

  9. 9. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose more complex issues.Safety Note

  10. 10. Airbag System Caution

    Always exercise caution when working with airbag systems. Disconnect the battery and wait for a period (usually around 10-15 minutes) before working on any airbag components to avoid accidental deployment. By following these steps, you should be able to identify and resolve the issue related to the B1937 code