B1929 – Air Bag Safing Sensor Output Circuit Open

The ODBII code B1929 indicates that there is an open circuit in the airbag safing sensor output, which may prevent the airbag system from functioning properly.

The severity of ODBII code B1929 is typically considered moderate to high.

Common Causes For: B1928 Air Bag Safing Sensor Output Circuit Failure

• Faulty airbag safing sensor
• Open circuit in the wiring harness
• Poor electrical connections or corroded terminals
• Damaged or frayed wiring
• Faulty airbag control module
• Malfunctioning connectors or plugs
• Issues with the vehicle’s body control module (BCM)

Common misdiagnosis for B1929 Air Bag Safing Sensor Output Circuit Open

• Faulty airbag module
• Defective airbag sensor
• Wiring issues or shorts in the airbag system
• Malfunctioning seat belt pretensioner
• Incorrectly installed or damaged airbag connectors
• Faulty crash sensor
• Issues with the vehicle’s body control module (BCM)

Common Troubleshooting Steps

When dealing with OBD-II code B1929, which indicates an issue with the Air Bag Safing Sensor Output Circuit being open, it’s important to follow a systematic approach to troubleshoot the problem. Here are common troubleshooting steps:

• Scan Tool Verification:
• Use an OBD-II scanner to confirm the presence of the B1929 code. Check for any other related codes that may provide additional context.
• Visual Inspection:
• Inspect the wiring and connectors associated with the airbag system, particularly the safing sensor. Look for signs of damage, corrosion, or loose connections.
• Check the airbag module and any related components for physical damage.
• Check the Safing Sensor:
• The safing sensor is designed to detect a collision and send a signal to the airbag control module. Ensure that the sensor is properly connected and functioning.
• If possible, test the sensor according to the manufacturer’s specifications. This may involve checking resistance or voltage levels.
• Inspect the Airbag Control Module:
• Ensure that the airbag control module is functioning correctly. Check for any signs of damage or corrosion on the module and its connectors.
• If the module is suspected to be faulty, it may need to be tested or replaced.
• Wiring Continuity and Resistance Testing:
• Use a multimeter to check for continuity in the wiring between the safing sensor and the airbag control module. Look for any breaks or shorts in the wiring.
• Measure the resistance of the circuit to ensure it is within the manufacturer’s specifications.
• Check for Ground Issues:
• Ensure that the ground connections for the airbag system are secure and free of corrosion. A poor ground can cause various issues, including open circuits.
• Clear Codes and Test Drive:
• After performing repairs or adjustments, clear the trouble codes using the OBD-II scanner.
• Test drive the vehicle to see if the code reappears. If it does, further investigation may be necessary.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the B1929 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Professional Diagnosis:
• If the issue persists after following the above steps, consider seeking help from a professional technician or an automotive electrician who specializes in airbag systems. Always remember to take proper safety precautions when working with airbag systems, as they can be dangerous if mishandled. Disconnect the vehicle’s battery and wait for a period (usually around 10-15 minutes) before working on the airbag system to ensure that the capacitors are discharged.