WOMS
B code body High severity

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

The OBD2 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

Definition

The OBD2 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

Common causes

  • 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 misdiagnoses

  • 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

Troubleshooting steps

  1. 1. Scan Tool Verification

  2. 2. Use an OBD-II scanner to confirm the presence of the B1906 code. Check for any additional codes that may provide more context

  3. 3. Visual Inspection

  4. 4. 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

  5. 5. Check the airbag module and sensor mounting points for any signs of impact or physical damage

  6. 6. Check for Shorts

  7. 7. Use a multimeter to check for continuity in the feed and return circuits of the crash sensor. Look for any shorts to ground

  8. 8. 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

  9. 9. Inspect the Crash Sensor

  10. 10. 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

  11. 11. Check Ground Connections

  12. 12. 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

  13. 13. Clear Codes and Test Drive

  14. 14. 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

  15. 15. 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

  16. 16. Professional Diagnosis

  17. 17. 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

  18. 18. Safety Precautions

  19. 19. 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