2007 GMC Sierra 1500 Pickup Owner's Manual - Page 247

Safety Belt Reminder Light When the key is turned to RUN or START, a chime will sound for several seconds to remind people to buckle their safety belts. The driver safety belt light will also come on and stay on for several seconds, then it will flash for several more. You should buckle your seat belt. This chime and light will be repeated if the driver remains unbuckled and the vehicle is in motion. Airbag Readiness Light There is an airbag readiness light on the instrument panel cluster, which shows the airbag symbol. The system checks the airbag's electrical system for malfunctions. The light tells you if there is an electrical problem. The system check includes the airbag sensors, the airbag modules, the wiring and the crash sensing and diagnostic module and, if equipped, the passenger sensing system. For more information on the airbag system, see Airbag System on page 91. This light will come on when you start your vehicle, and it will flash for a few seconds. This means the system is ready. If the airbag readiness light stays on after the vehicle is started or comes on while you are driving, the airbag system may not be working properly. Have your vehicle serviced right away. See DIC Warnings and Messages on page 270 for more information on driver and passenger safety belt reminders. If the driver's belt is buckled, neither the chime nor the light will come on. See Passenger Sensing System on page 103 for more information. 247