B1905 – Air Bag Crash Sensor #2 Feed/Return Circuit Short To Battery

The ODBII code B1905 indicates a short circuit in the feed or return circuit of Air Bag Crash Sensor #2, which means there is an electrical fault causing the sensor to receive constant battery voltage instead of the expected signal.

The severity of ODBII code B1905 is typically considered moderate to high.

Common Causes For: B1904 Air Bag Crash Sensor #2 Feed/Return Circuit Failure

• Damaged wiring or connectors
• Short circuit in the feed/return circuit
• Faulty airbag crash sensor
• Corrosion in electrical connections
• Improper installation or modifications
• Faulty airbag control module
• Grounding issues in the circuit

Common misdiagnosis for B1905 Air Bag Crash Sensor #2 Feed/Return Circuit Short To Battery

• Faulty airbag control module
• Defective crash sensor
• Wiring issues or shorts in the harness
• Poor ground connections
• Faulty seat belt pretensioner
• Malfunctioning airbag indicator light
• Issues with the vehicle’s body control module (BCM)
• Battery or charging system problems

Common Troubleshooting Steps

When dealing with OBD-II code B1905, which indicates a problem with the Air Bag Crash Sensor #2 Feed/Return Circuit Short to Battery, 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 B1905 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 or battery voltage.
• Disconnect the sensor and measure the resistance of the circuit. Compare the readings to the manufacturer’s specifications.
• 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 or replace it with a known good unit to see if the code clears.
• Check the Airbag Module:
• Inspect the airbag control module for any signs of damage or corrosion. Ensure that all connections are secure.
• If possible, perform a reset of the airbag module using a scan tool to see if the code returns.
• 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 false codes.
• Inspect Related Components:
• Check other components in the airbag system, such as the seat belt tensioners and other crash sensors, for proper operation.
• Clear the Code:
• After performing repairs or inspections, clear the code using the scan tool and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs):
• Look for any TSBs related to the airbag system for your specific vehicle make and model. There may be known issues or recalls that could be relevant.
• Professional Diagnosis:
• If the issue persists after following these steps, consider seeking help from a professional technician who specializes in automotive electrical systems or airbag systems. 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 consult a professional.