2007 GMC Envoy Owner's Manual - Page 78

If the front of your vehicle goes straight into a wall that does not move or deform, the threshold level for the reduced deployment is about 9 to 16 mph (14 to 26 km/h), and the threshold level for a full deployment is about 18 to 25 mph (29 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. Frontal airbags may inflate at different crash speeds. For example: • If the vehicle hits a stationary object, the airbags could inflate at a different crash speed than if the vehicle hits a moving object. • If the vehicle hits an object that deforms, the airbags could inflate at a different crash speed than if the vehicle hits an object that does not deform. • If the vehicle hits a narrow object (like a pole), the airbags could inflate at a different crash speed than if the vehicle hits a wide object (like a wall). • If the vehicle goes into an object at an angle, the airbags could inflate at a different crash speed than if the vehicle goes straight into the object. 78 Frontal airbags (driver and right front passenger) are not intended to inflate during vehicle rollovers, rear impacts, or in many side impacts. Your vehicle has seat position sensors which enables the sensing system to monitor the position of the driver's seat and the right front passenger's seat. Seat position sensors provide information that is used to determine if the airbags should deploy at a reduced level or at full deployment. Your vehicle may or may not have roof-mounted airbags and a rollover sensor. See Airbag System on page 71. These "rollover capable" airbags are intended to inflate in moderate to severe side crashes or during a rollover. A roof-mounted airbag will inflate if the crash severity is above the system's designed "threshold level." The threshold level can vary with specific vehicle design. Roof-mounted airbags are not intended to inflate in frontal or near-frontal impacts, or rear impacts. Both roof-mounted airbags will deploy when either side of the vehicle is struck or during a rollover.