* Crash Severity: Sensors detect the force and direction of impact. A certain threshold of force must be exceeded for airbags to deploy.
* Occupancy: Sensors in the seats detect the presence and weight of occupants. This influences whether airbags deploy and with what force.
* Impact Location: The location of the impact (front, side, etc.) determines which airbags deploy.
If you're experiencing unexpected airbag light illumination or suspect a problem with your Trailblazer's airbag system, do not attempt to diagnose or repair it yourself. Airbag systems are complex and potentially dangerous. Take your vehicle to a qualified mechanic or dealership for diagnosis and repair. Improperly handling the system could lead to injury or even death.