- Airbag light is on: This is the most common sign. The airbag system is detecting a fault.
- Airbag system failure message: Your car's display might show a specific error message related to the airbag system.
- Airbags don't deploy in an accident: This is a critical failure. If the module isn't working, the airbags may not deploy when needed.
- Airbags deploy for no reason: This is rare, but a faulty module can sometimes cause unintended deployment.
To test if the airbag control module is the problem, a mechanic will:
- Use a scan tool to read the fault codes stored in the module.
- Check the wiring and connections to the module for damage or corrosion.
- Test the other components of the airbag system, such as the airbags themselves, the seatbelt pretensioners, and the crash sensors.
- If all other components are working correctly, the module is likely the problem.
Common failure causes:
- Water damage: Leaks can damage the module's internal components.
- Electrical surges: Power surges can fry the module.
- Accident damage: Even if the airbags don't deploy, an accident can damage the module.
- Corrosion: Over time, corrosion can build up on the module's connectors.
- Internal component failure: Like any electronic device, the module can simply fail over time.
