GMC Safari 2003 Owner's Manual page 150

Safety Belt Reminder Light
When the key is turned to RUN or START, a tone will
come on for several seconds to remind people to fasten
their safety belts, unless the driver's safety belt is
already buckled.
If the driver's belt is already buckled, neither the tone
nor the light will come on.
3-26
The safety belt light will
also come on and stay on
for several seconds, then it
will flash for several more.
Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel, which shows AIR BAG or the air bag symbol. The
system checks the air bag's electrical system for
malfunctions. The light tells you if there is an electrical
problem. The system check includes the air bag
sensor, the air bag modules, the wiring and the crash
sensing and diagnostic module. For more information on
the air bag system, see Air Bag System on page 1-62 .
United States
This light will come on when you start your vehicle, and
it will flash for a few seconds. Then the light should
go out. This means the system is ready.
Canada