WOMS
B code body Medium severity

B1918 Air Bag Memory Clear Circuit Open

The OBD2 code B1918 indicates that there is an open circuit in the airbag memory clear circuit, which may prevent the airbag system from properly resetting or clearing stored fault codes

Definition

The OBD2 code B1918 indicates that there is an open circuit in the airbag memory clear circuit, which may prevent the airbag system from properly resetting or clearing stored fault codes

Common causes

  • Open circuit in the airbag memory clear circuit
  • Faulty airbag control module
  • Damaged wiring or connectors
  • Poor ground connection
  • Faulty ignition switch
  • Corroded terminals or connectors

Common misdiagnoses

  • Faulty airbag control module
  • Open circuit in airbag wiring harness
  • Defective airbag sensor
  • Malfunctioning seat belt pretensioner
  • Issues with the vehicle's body control module (BCM)
  • Faulty connectors or terminals in the airbag system
  • Low battery voltage or electrical system issues
  • Incorrectly installed or damaged airbag components

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 other issues in the airbag system

  2. 2. Inspect the Airbag System Wiring

    Visually inspect the wiring and connectors associated with the airbag system, particularly those related to the memory clear circuit. Look for signs of damage, corrosion, or loose connections

  3. 3. Check the Airbag Module

    Ensure that the airbag control module is securely connected and that there are no signs of damage. If the module is faulty, it may need to be replaced

  4. 4. Test the Circuit

    Use a multimeter to test the continuity of the memory clear circuit. Check for any breaks or shorts in the wiring. If the circuit is open, trace the wiring to find the fault

  5. 5. Inspect the SRS (Supplemental Restraint System) Components

    Check other components of the SRS, such as the crash sensors, seat belt tensioners, and airbag connectors. Ensure they are functioning correctly and are properly connected

  6. 6. Clear the Codes

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

  7. 7. Check for Recalls or Technical Service Bulletins (TSBs)

    Research if there are any recalls or TSBs related to the airbag system for your vehicle make and model. Sometimes manufacturers issue fixes for known issues

  8. 8. Consult a Professional

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or an automotive technician who specializes in airbag systems. They may have access to specialized diagnostic tools and equipment

  9. 9. Replace Faulty Components

    If any faulty components are identified during the inspection and testing, replace them as necessary. This may include wiring harnesses, connectors, or the airbag control module itself

  10. 10. Recheck System Functionality

    After repairs, recheck the airbag system functionality to ensure that the airbag warning light is off and that the system is operating correctly.Safety Note: Working on airbag systems can be dangerous due to the potential for accidental deployment. Always follow safety precautions, such as disconnecting the battery and waiting for a period before working on the airbag system. If unsure, seek professional assistance