2003 GMC Sierra 1500 Pickup Owner's Manual - Page 72

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 Ofl-Road Driving with Your Four-Wheel-Drive Vehicle on page 4-21 for more tips on off-road driving. Dual Stage Air Bags If your vehicle has frontal air bags with dual stage deployment, the amount of restraint will adjust according to crash severity. For moderate frontal impacts, these air bags inflate at a level less than full depioyment. For more severe frontal impacts, full deployment occurs. If the front of your vehicle goes straight into a wall that doesn't move or deform, the threshold level for the reduced deployment is about 10 to 16 mph (16 to 25 km/h), and the threshold level for a full deployment is about 20 to 25 mph (32 to 40 km/h). The threshold level can vary, however, with specific vehicle design, so that it can be somewhat above or below this range. If your vehicle strikes something that will move or deform, such as a parked car, the threshold level will be higher. The air bag is not designed to inflate in rollovers, rear impacts, or in many side impacts because inflation would not help the occupant. 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 3-36 or Passenger Sensing System on page 1-74. Seat Position Sensors Vehicle's with dual stage air bags are also equipped with special sensors which enable the sensing system to monitor the position of both the driver and passenger front seats. The seat position sensor provides information which is used to determine if the air bags should deploy at a reduced level or at full deployment. 1-65