* Faulty Crash Sensor: These sensors detect impacts and trigger airbag deployment. A malfunctioning sensor can send a false signal, illuminating the light.
* Low Voltage/Weak Battery: A weak battery can cause the system to malfunction and trigger the light.
* Clock Spring (Spiral Cable): This component allows the airbag and steering wheel controls to rotate with the steering wheel. A broken or worn clock spring is a common cause of airbag light issues.
* Faulty Airbag Control Module (ACM): This is the "brain" of the SRS system. A malfunctioning ACM is often the most expensive repair.
* Faulty Airbag Module (In the airbag itself): While less common, a problem within an individual airbag can trigger the light.
* Loose or Corroded Connections: Worn or corroded connections within the wiring harness can interrupt the system's operation.
* Seatbelt Pretensioner Issues: Problems with the seatbelt pretensioners (which tighten during a crash) can also set off the light.
* Deployment of the Airbag (or a prior deployment): If an airbag has ever deployed, it needs to be replaced, and the system reset. The light will remain on until this is done.
* Incorrectly installed seat or restraint system: Installing a child safety seat or after-market seat incorrectly can sometimes cause the light to illuminate.
To diagnose the specific problem, you'll need to have the system professionally scanned using an OBD-II code reader that can read SRS codes. A standard OBD-II reader may not be sufficient for the airbag system. This scan will provide a specific code indicating the likely source of the problem. Do not attempt to repair the system yourself unless you are highly experienced with automotive electrical systems and SRS; improper handling can be dangerous. Take it to a qualified mechanic or dealership for diagnosis and repair.
