2003 GMC Sierra 1500 Pickup Owner's Manual - Page 537

CAUTION: (Continued, Even though the passenger sensing system is designed to turn off the passenger's frontal air bag if the system detects a rear-facing child restraint, no system is fail-safe, and no one can guarantee that an air bag will notdeploy under some unusual circumstance, even though it is turned off. General Motors, therefore, recommends that rear-facing child restraints be secured in the rear seat whenever possible, even if the air bag is off. The passenger sensing system is designed to turn off the right front passenger's frontal air bag if: the right front passenger seat is unoccupied the system determines that an infant is present in a rear-facing infant seat the system determines that a small child is present in a forward-facing child restraint the system determines that a small child is present in a booster seat a right front passenger takes hislher weight off of the seat for a period time of the right front passenger seat is occupied by a smaller person, such as a child who has outgrown child restraints or if there is a critical problem with the air bag system or the passenger sensing system. For some children who have outgrown child restraints and for very small adults, the passenger sensing system may or may not turn off the right front passenger's frontal air bag, depending upon the person's seating posture and body build. Everyone in your vehicle who has outgrown child restraints should wear a safety belt properly - whether or not there is an air bag for that person. 2