What does the B003A fault code mean?
The B003A fault code, applicable to all car manufacturers, means “Second Row Right Frontal Stage 2 Deployment Control (Subfault)“.
Background Information: Newer vehicles use multi-stage airbags to regulate the pressure inside the airbag. The higher the pressure, the greater the force of the airbag deployment. The system automatically determines the airbag deployment strength based on parameters such as collision intensity, passenger weight, seat belt usage, child seat presence, and distance from the airbag. This design ensures that the airbag deploys with moderate force in most collisions, reserving maximum force for the most severe collisions.
Possible Symptoms of B003A:
- Airbag warning light illuminated
- Airbag did not deploy
Possible Causes of B003A:
- Faulty second-row right front airbag
- Second-row right front airbag seat belt open or short circuit
- Poor electrical connection in the second-row right front airbag circuit
- Sensor and Diagnostic Module (SDM) malfunction
Common Diagnosis and Repair for B003A:
Diagnostic Steps:
- OBD-II scanner code check: Use a professional OBD2 airbag scanner tool to confirm the presence of the B003A fault code and check for other related codes in the airbag/SRS system.
- Visual inspection of airbag components: Check wiring, connectors, and airbag modules for visible damage or loose connections.
- Check the occupant detection system: Test the system to ensure it correctly identifies occupants in the seats.
- Test the airbag deployment circuit: Confirm that the airbag deployment circuit (including sensors and inflators) is functioning correctly.
- Reset the system and test: After repair or inspection, clear the system codes and test the airbag deployment to confirm the problem is resolved.
Repair:
- Repairing or replacing damaged wiring, faulty sensors, or faulty control modules usually resolves the problem.
- If a defective inflator or airbag is found, replacement may be necessary.
Airbags typically deploy in stages based on factors such as impact severity, seat belt status, and occupant weight. Stage two deployment occurs in more severe impacts, especially in the second row. It is strongly recommended that you have your vehicle inspected and diagnosed by a vehicle technician as soon as possible.