B1933 – Air Bag Passenger Circuit Open

The ODBII code B1933 indicates that there is an open circuit in the passenger airbag system, which means the system is not receiving the necessary signal or power to function properly.

The severity of ODBII code B1933 is moderate to high.

Common Causes For: B1932 Air Bag Driver Circuit Open

• Open circuit in the passenger airbag wiring
• Faulty passenger airbag module
• Damaged or corroded connectors
• Faulty airbag control module
• Disconnected or loose wiring harness
• Faulty seat occupancy sensor
• Issues with the vehicle’s body control module (BCM)

Common misdiagnosis for B1933 Air Bag Passenger Circuit Open

• Faulty airbag module
• Defective seat belt buckle
• Malfunctioning airbag sensor
• Wiring issues or shorts in the harness
• Faulty passenger seat occupancy sensor
• Issues with the airbag control unit
• Problems with the vehicle’s electrical system

Common Troubleshooting Steps

When dealing with an OBD-II code B1933, which indicates an “Air Bag Passenger Circuit Open,” 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 B1933 code. Check for any other related codes that may provide additional context.
• 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 seat belt buckle, as these can also affect the airbag system.
• Check the Passenger Airbag Connector:
• Ensure that the connector for the passenger airbag is securely connected. If the vehicle has been in an accident or had seat repairs, the connector may have been disturbed.
• Inspect the Seat Wiring:
• If the vehicle has a seat occupancy sensor, inspect the wiring and connectors associated with it. A fault in this circuit can trigger the B1933 code.
• Test the Airbag System:
• Use a multimeter to test the resistance of the airbag circuit. Compare the readings to the manufacturer’s specifications. An open circuit will show infinite resistance.
• Check for Ground Issues:
• Ensure that the airbag system has a good ground connection. A poor ground can lead to circuit issues.
• Examine the Airbag Module:
• If all wiring and connections appear to be in good condition, the airbag control module itself may be faulty. Testing or replacing the module may be necessary.
• Clear the Code and Test Drive:
• After performing repairs, clear the code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the airbag system for your specific vehicle make and model. There may be known issues or recalls that could apply.
• Professional Diagnosis:
• If the issue persists after following these steps, it may be necessary to consult a professional technician or dealership for further diagnosis. Always remember to take proper safety precautions when working with airbag systems, as they can deploy unexpectedly and cause injury. If you’re unsure about any step, it’s best to seek professional assistance.