B1906 – Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground

The ODBII code B1906 indicates a short circuit to ground in the feed or return circuit of Air Bag Crash Sensor #2, which can affect the airbag system’s functionality.

The severity of ODBII code B1906 is typically considered moderate to high.

Common Causes For: B1905 Air Bag Crash Sensor #2 Feed/Return Circuit Short To Battery

• Damaged wiring or connectors
• Shorted wires
• Faulty airbag crash sensor
• Corroded connectors
• Poor ground connection
• Water intrusion or moisture damage
• Improper installation or repairs
• Faulty airbag control module

Common misdiagnosis for B1906 Air Bag Crash Sensor #2 Feed/Return Circuit Short To Ground

• Faulty airbag control module
• Defective airbag sensor
• Wiring issues unrelated to the crash sensor
• Faulty connectors or terminals
• Incorrectly diagnosed seat belt pretensioner
• Malfunctioning diagnostic tool readings
• Software or calibration issues in the airbag system

Common Troubleshooting Steps

When dealing with an OBD-II code B1906, which indicates a problem with the Air Bag Crash Sensor #2 Feed/Return Circuit Short to Ground, 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 B1906 code. Check for any additional codes that may provide more 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 signs of impact or physical damage.
• Check for Shorts:
• Use a multimeter to check for continuity in the feed and return circuits of the crash sensor. Look for any shorts to ground.
• Disconnect the sensor and check the resistance of the circuit. If the resistance is too low (indicating a short), trace the wiring back to find the source of the short.
• Inspect the Crash Sensor:
• If the wiring appears intact, the crash sensor itself may be faulty. Test the sensor according to the manufacturer’s specifications. If it does not meet the required parameters, it may need to be replaced.
• Check Ground Connections:
• Ensure that all ground connections related to the airbag system are secure and free of corrosion. A poor ground can cause erratic behavior in the system.
• Clear Codes and Test Drive:
• After performing repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the airbag system. This can provide additional insights into the circuit layout and potential issues.
• Professional Diagnosis:
• If the issue persists after following the above steps, consider seeking help from a professional technician who specializes in automotive electrical systems, particularly airbag systems.
• Safety Precautions:
• Always take necessary safety 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 identify and resolve the issue related to the B1906 code.