GMC 1995 Safari Owner's Manual page 247

Malfunction Indicator Lamp
(SERVICE ENGINE SOON LIGHT)
This light on your instrument panel lets you know when your emission
system needs
service.
The light will come on briefly when you start your
engine to let you know that the system is working. If it does not come on
when you start your engine, or if it comes on and stays on while you're
driving, your system may need service. Your vehicle should still be
driveable, but vou should have your system serviced right away.
Tires
We don't make tires. Your new vehicle comes with high quality tires made
by a leading tire manufacturer. These tires are warranted by the tire
manufacturers and their warranties are delivered with every new vehicle. If
your spare tire is a different brand than your road tires, you will have a tire
warranty folder from each of these manufacturers.