2007 GMC Sierra 1500 Pickup Owner's Manual - Page 250

Passenger Airbag Status Indicator If your vehicle has the passenger sensing system, your rearview mirror will have a passenger airbag status indicator. will light either ON or OFF, or either the on or off symbol to let you know the status of the right front passenger's frontal airbag. Your vehicle may have a label on your sun visor that says, "Never put a rear-facing child seat in the front." This is because the risk to the rear-facing child is so great, if the airbag deploys. {CAUTION: United States Canada When the ignition key is turned to RUN or START, the passenger airbag status indicator will light ON and OFF, or the symbol for on and off, for several seconds as a system check. Then, after several more seconds, the status indicator 250 Even though the passenger sensing system is designed to turn off the passenger's frontal airbag if the system detects a rear-facing child restraint, no system is failsafe, and no one can guarantee that an airbag will not deploy under some unusual circumstance, even though it is turned off. We recommend that rear-facing child restraints be secured in the rear seat, even if the airbag is off.