GMC 1999 Sierra 1500 Pickup Owner's Manual page 152

Features & Controls
CHECK GAGES Light
This light will come on briefly when you are starting the engine. If the light
comes on and stays on while you are driving, it could indicate a problem with
your vehicle. Check your various gages to see if they are in the warning
zones.
K2330
Daytime Running Lights (DRL) Indicator Light (Canada On/y)
I -
K2318
If
your vehicle was first sold, when new, in Canada, you
will
have this green
light on the instrument panel. It will light, just above the speedometer,
whenever the Daytime Running Lights are on. For more details about DRL,
see "Headlights and Vehicle Lighting" in this section.
2-84