B1907 – Air Bag Crash Sensor #2 Ground Circuit Failure

The ODBII code B1907 indicates a malfunction in the ground circuit of Air Bag Crash Sensor #2, suggesting that the sensor is not properly grounded, which can affect the airbag system’s functionality.

The severity of ODBII code B1907 is typically considered moderate to high.

Common Causes For: B1906 Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground

• Faulty airbag crash sensor
• Damaged wiring or connectors
• Poor ground connection
• Short circuit in the wiring harness
• Corrosion at connectors
• Faulty airbag control module
• Open circuit in the ground path
• Impact damage to the sensor or wiring

Common misdiagnosis for B1907 Air Bag Crash Sensor #2 Ground Circuit Failure

• Faulty airbag control module
• Defective airbag sensor
• Wiring issues unrelated to the ground circuit
• Faulty seat belt pretensioner
• Incorrectly installed or damaged airbag system components
• Battery or power supply issues
• Faulty connectors or terminals in the airbag system

Common Troubleshooting Steps

When dealing with an OBD-II code B1907, which indicates a “Air Bag Crash Sensor #2 Ground 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 B1907 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 those related to Crash Sensor #2. Look for signs of damage, corrosion, or loose connections.
• Check the airbag module and sensor mounting points for any physical damage.
• Check Ground Connections:
• Locate the ground point for the airbag system and ensure it is clean, tight, and free of corrosion. A poor ground connection can lead to circuit failures.
• Use a multimeter to test the ground circuit for continuity. If there is no continuity, trace the wiring back to the ground point.
• Test the Sensor:
• If possible, test the crash sensor itself for proper operation. This may involve checking the resistance or voltage output according to the manufacturer’s specifications.
• If the sensor is faulty, it may need to be replaced.
• Inspect the Airbag Control Module:
• Check the airbag control module for any signs of damage or malfunction. Ensure that it is properly connected and functioning.
• If the module is suspected to be faulty, it may need to be tested or replaced.
• Wiring Inspection:
• Inspect the wiring harness for any signs of wear, fraying, or damage. Pay special attention to areas where the wiring may be exposed to heat or abrasion.
• Use a multimeter to check for shorts or opens in the wiring between the sensor and the control module.
• Clear Codes and Test Drive:
• After addressing any issues found, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears. Monitor the airbag system to ensure it is functioning correctly.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the airbag system and crash sensors.
• Professional Assistance:
• If the issue persists after performing the above steps, consider seeking help from a professional technician or an automotive specialist with experience 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 of time before working on the airbag components to ensure that the system is deactivated.