B1918 – Air Bag Memory Clear Circuit Open
The ODBII 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.
The severity of ODBII code B1918 is moderate.
Common Causes For: B1917 Air Bag Memory Clear Circuit Failure
- 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 misdiagnosis for B1918 Air Bag Memory Clear Circuit Open
- 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
Common Troubleshooting Steps
The OBD-II code B1918 refers to an issue with the airbag system, specifically indicating that there is an open circuit in the airbag memory clear circuit. This can prevent the airbag system from functioning properly and may trigger the airbag warning light on the dashboard. Here are some common troubleshooting steps to diagnose and resolve the issue:
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.