When the engine is started, a chime comes on for several seconds to remind people to fasten their safety belts, unless the driver safety belt is already buckled.
The safety belt light also comes on and stay on for several seconds, then it flashes for several more.
This chime and light is repeated if the driver remains unbuckled and the vehicle is in motion. If the driver safety belt is already buckled, neither the chime nor the light comes on.