Chevrolet 1994 Astro Passenger Owner's Manual page 103

Daytime Running Lights (DRL) indicator Light
(Canada Only)
If your vehicle was first sold, when new, in Canada, you will have this light
on the instrument panel. It goes on whenever the Daytime Running Lights
are on, the ignition is on, the headlamp switch is off, and the parking brake
is released.
Daytime Running Lights (Canada Only)
The Canadian Federal Government has decided that "Daytime Running
Lights" (DRL) is a useful feature, in that DRL can make your vehicle more
visible to pedestrians and other drivers during daylight hours. DRL is
required on new vehicles sold in Canada.
The high beam headlights will come on at reduced brightness in daylight
when:
0
The ignition is on,
0
The headlight switch is off, and
0
The parking brake is released.
When you turn on your headlights, the DRL will switch off and the exterior
lights will come on. When you turn off the headlights, the exterior lights
will go out and the high beams will change to the reduced brightness of
DRL again.
The DRL indicator light on the instrument panel will go on whenever the
DRL is on. This light means that only the DRL is on. When you turn on
your exterior lights, this light will go out.
If the DRL indicator light is on at dawn or dusk, it is a reminder to turn on
your headlights.
Of course, you may still turn on the headlights any time you need to.
To idle your vehicle with the DRL off, set the parking brake, The DRL will
stay off until you release the parking brake.
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