B1908 – Air Bag Crash Sensor #2 Ground Circuit Short To Battery

The ODBII code B1908 indicates a malfunction in the airbag system, specifically that the ground circuit for Air Bag Crash Sensor #2 is shorted to the battery, which can prevent the airbag from deploying properly in the event of a crash.

The severity of ODBII code B1908 is typically considered moderate to high.

Common Causes For: B1907 Air Bag Crash Sensor #2 Ground Circuit Failure

• Damaged wiring or connectors
• Short circuit in the ground circuit
• Corroded connectors
• Faulty airbag crash sensor
• Poor ground connection
• Water intrusion or moisture damage
• Aftermarket modifications or installations
• Electrical system faults

Common misdiagnosis for B1908 Air Bag Crash Sensor #2 Ground 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 diagnostic tool readings
• Incorrectly installed or damaged airbag system components

Common Troubleshooting Steps

When dealing with an OBD-II code B1908, which indicates a problem with the airbag crash sensor #2 ground 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 B1908 code. Check for any additional codes that may provide more context.
• Visual Inspection:
• Inspect the wiring and connectors associated with the airbag crash sensor #2. Look for signs of damage, corrosion, or loose connections.
• Check the ground connections for the airbag system to ensure they are secure and free of corrosion.
• Check the Sensor:
• Locate the airbag crash sensor #2 and inspect it for physical damage.
• Ensure that the sensor is properly mounted and that there are no obstructions.
• Test the Ground Circuit:
• Use a multimeter to test the ground circuit of the airbag crash sensor. Check for continuity between the sensor ground pin and the vehicle chassis ground.
• If there is no continuity, trace the wiring back to find any breaks or shorts.
• Check for Shorts:
• Inspect the wiring harness for any signs of shorts to power or other circuits. Look for frayed wires or areas where the insulation may be damaged.
• Use the multimeter to check for voltage on the ground circuit. If you find battery voltage, there is likely a short to power.
• Inspect the Airbag Module:
• If the wiring and sensor check out, inspect the airbag control module for faults. Ensure that it is receiving proper power and ground.
• Clear the Code:
• After performing repairs, clear the code using the OBD-II scanner and 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.
• Professional Help:
• If the issue persists after following these steps, consider seeking assistance from a professional technician who specializes in automotive electrical systems or airbag systems.Safety Precautions: – Always disconnect the vehicle’s battery before working on the airbag system to prevent accidental deployment. – Follow proper safety protocols when handling airbag components. By following these steps, you should be able to identify and resolve the issue related to the B1908 code.