B1941 – Air Bag Crash Sensor #1 Feed/Return Circuit Open

The ODBII code B1941 indicates that there is an open circuit in the feed or return path of Air Bag Crash Sensor #1, which can prevent the airbag system from functioning properly.

The severity of ODBII code B1941 is typically considered moderate to high.

Common Causes For: B1939 Air Bag Passenger Pressure Switch Circuit Short To Ground

• Damaged wiring or connectors
• Faulty airbag crash sensor
• Poor ground connection
• Corroded terminals
• Open circuit in the feed/return wiring
• Faulty airbag control module
• Disconnected or loose connectors

Common misdiagnosis for B1941 Air Bag Crash Sensor #1 Feed/Return Circuit Open

• Faulty airbag module
• Defective crash sensor
• Wiring issues unrelated to the crash sensor
• Faulty seat belt pretensioner
• Malfunctioning airbag control unit
• Incorrectly diagnosed as a problem with the airbag itself
• Issues with the vehicle’s body control module (BCM)

Common Troubleshooting Steps

When dealing with an OBD-II code B1941, which indicates an issue with the Air Bag Crash Sensor #1 Feed/Return Circuit being open, there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Visual Inspection: **Wiring and Connectors: Check the wiring and connectors associated with the airbag crash sensor. Look for any signs of damage, corrosion, or loose connections.
• **Sensor Mounting: Ensure that the crash sensor is properly mounted and not physically damaged.
• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate related issues.
• Test the Sensor: **Resistance Check: Measure the resistance of the crash sensor using a multimeter. Compare the readings to the manufacturer’s specifications.
• **Connector Check: Ensure that the sensor connector is clean and free of corrosion. Check for bent pins or poor connections.
• Inspect the Airbag Module: Check the airbag control module for any signs of damage or corrosion. Ensure that it is securely connected and functioning properly.
• Check the Circuit: **Continuity Test: Perform a continuity test on the feed and return circuits to ensure there are no breaks or shorts in the wiring.
• **Voltage Test: With the ignition on (but the engine off), check for the correct voltage at the sensor connector. Compare with manufacturer specifications.
• Repair or Replace Components: If any damaged wiring, connectors, or the sensor itself is found, repair or replace the affected components as necessary.
• Clear Codes and Test Drive: After making repairs, clear the trouble codes using the OBD-II scanner. Then, take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: If the issue persists, consult the vehicle’s service manual for specific diagnostic procedures related to the airbag system and the B1941 code.
• Professional Help: If you are unable to resolve the issue, consider seeking help from a professional mechanic or an automotive technician who specializes in airbag systems.Safety Note
• Airbag System Caution: Always take precautions when working with airbag systems. Disconnect the battery and wait for a period (usually around 10-15 minutes) before working on the airbag components to avoid accidental deployment. By following these steps, you should be able to diagnose and address the issue related to the B1941 code effectively.