2004 GMC Sierra 1500 Pickup Owner's Manual - Page 79

{CAUTION: If something is between an occupant and an air bag, the bag might not inflate properly or it might force the object into that person causing severe injury or even death. The path of an inflating air bag must be kept clear. Don't put anything between an occupant and an air bag, and don't attach or put anything on the steering wheel hub or on or near any other air bag covering. The air bag system is designed to work properly under a wide range of conditions, including off-road usage. Observe safe driving speeds, especially on rough terrain. As always, wear your safety belt. See Off-Road Driving with Your Four-Wheel-Drive Vehicle on page 4-20 for more tips on off-road driving. Single Stage vs. Dual Stage Air Bags Depending on the weight of your vehicle you will have either "Single Stage Air Bags" or "Dual Stage Air Bags". Vehicles that have a passenger sensing system also have dual stage air bags. If the rearview mirror in your vehicle has a passenger air bag status indicator printed on it, your vehicle has the passenger sensing system and therefore, it has dual stage air bags. If the rearview mirror in your vehicle does not have a passenger air bag status indicator printed on it, then your vehicle does not have the passenger sensing system and it has single stage air bags. See Passenger Air Bag Status Indicator on page 3-40 or Passenger Sensing System on page 1-81. When Should an Air Bag Inflate? An air bag is designed to inflate in a moderate to severe frontal, or near-frontal crash. The air bag will inflate only if the impact speed is above the system's designed "threshold level." In any particular crash, no one can say whether an air bag should have inflated simply because of the damage to a vehicle or because of what the repair costs were. Inflation is determined by the angle of the impact and how quickly the vehicle slows down in frontal or near-frontal impacts. 1-73