2009 GMC Savana Van Owner's Manual - Page 68

Single Stage vs. Dual Stage Airbags Depending on the weight of the vehicle, you will have either "Single Stage Airbags" or "Dual Stage Airbags." Vehicles that have a passenger sensing system also have dual stage airbags. See Passenger Airbag Status Indicator on page 3-29 or Passenger Sensing System on page 1-71. If the GVWR (Gross Vehicle Weight Rating) of the vehicle is 8,500 lb (3 855 kg) or above, the vehicle may have single stage airbags. If the GVWR is below 8,500 lb (3 855 kg) then the vehicle may have dual stage airbags. You can find the GVWR on the certification label on the rear edge of the driver door. See Loading the Vehicle on page 4-18 for more information. In addition, the vehicle may have dual-stage frontal airbags. Dual-stage airbags adjust the restraint according to crash severity. The vehicle has electronic frontal sensors, which help the sensing system distinguish between a moderate frontal impact and a more severe frontal impact. For moderate frontal impacts, dual-stage airbags inflate at a level less than full deployment. For more severe frontal impacts, full deployment occurs. The vehicle may or may not have roof-rail airbags. See Airbag System on page 1-58. Roof-rail airbags are intended to inflate in moderate to severe side crashes. In addition, these roof-rail airbags are intended to inflate during a rollover. Roof-rail airbags will inflate if the crash severity is above the system's designed threshold level. The threshold level can vary with specific vehicle design. Roof-rail airbags are not intended to inflate in frontal impacts, near-frontal impacts, or rear impacts. All roof-rail airbags will deploy when either side of the vehicle is struck. In any particular crash, no one can say whether an airbag should have inflated simply because of the damage to a vehicle or because of what the repair costs were. For frontal airbags, inflation is determined by what the vehicle hits, the angle of the impact, and how quickly the vehicle slows down. For roof-rail airbags, deployment is determined by the location and severity of the side impact. 1-64