B1920 – Air Bag Passenger Circuit Failure

The ODBII code B1920 indicates a failure in the passenger airbag circuit, which may involve issues with the airbag module, wiring, or connectors related to the passenger airbag system.

The severity of ODBII code B1920 Air Bag Passenger Circuit Failure is typically considered moderate to high.

Common Causes For: B1919 Air Bag Memory Clear Circuit Short To Battery

• Faulty passenger airbag module
• Damaged wiring or connectors in the airbag circuit
• Malfunctioning airbag control module
• Poor ground connection
• Corroded or loose connectors
• Faulty seat occupancy sensor
• Issues with the airbag deployment system

Common misdiagnosis for B1920 Air Bag Passenger Circuit Failure

• Faulty airbag module
• Defective seat occupancy sensor
• Wiring issues or shorts in the airbag circuit
• Malfunctioning airbag control unit
• Incorrectly installed or damaged passenger seat
• Faulty connectors or terminals in the airbag system
• Issues with the vehicle’s body control module (BCM)

Common Troubleshooting Steps

When dealing with OBD-II code B1920, which indicates an “Air Bag Passenger Circuit Failure,” it’s important to follow a systematic approach to troubleshoot the issue. Here are common troubleshooting steps:

• Scan Tool Verification:
• Use an OBD-II scanner to confirm the presence of the B1920 code. Check for any additional codes that may provide more context about the issue.
• Visual Inspection:
• Inspect the airbag system wiring and connectors, especially those related to the passenger airbag. Look for signs of damage, corrosion, or loose connections.
• Check the condition of the airbag module and the surrounding area for any physical damage.
• Check the Passenger Airbag Module:
• Ensure that the passenger airbag module is properly connected and seated. Disconnect and reconnect the module to ensure a good connection.
• Inspect the Seat Wiring:
• If the vehicle has a seat occupancy sensor, inspect the wiring and connectors associated with the seat. Look for any frayed wires or poor connections.
• Test the Seat Occupancy Sensor:
• If applicable, test the seat occupancy sensor for proper operation. This may involve checking resistance values or using a multimeter to ensure it is functioning correctly.
• Check for Short Circuits:
• Use a multimeter to check for short circuits in the wiring harness related to the passenger airbag circuit. Look for continuity where there shouldn’t be any.
• Clear Codes and Test Drive:
• After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code reappears.
• Check for Software Updates:
• In some cases, manufacturers release software updates for the airbag control module. Check if there are any updates available for your vehicle.
• Consult Technical Service Bulletins (TSBs):
• Look for any TSBs related to the airbag system for your specific make and model. These may provide additional guidance or known fixes for the issue.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional technician or dealership with experience in airbag systems. They may have specialized diagnostic tools and knowledge.Safety Note: Airbag systems are critical safety components. If you’re not experienced with automotive electrical systems or airbag diagnostics, it’s advisable to seek professional assistance to avoid accidental deployment or further issues.