GMC 1994 Yukon Owner's Manual page 104

Headlights-On Reminder
A buzzer will sound when your headlights are turned on and your ignition is
in OFF, LOCK or ACC. If you need to use your headlights when the
ignition switch is in OFF, LOCK or ACC, the buzzer can be turned off by
turning the interior light switch dial all the way off.
Daytime Running Lights (DRL) Indicator Light
(Canada Only)
f i
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.
Daytime Running Lights (Canada Only)
The Canadian Federal Government has decided that "Daytime Running
Lights" (DRL) are a useful feature, in that DRL can make your vehicle more
visible to pedestrians and other drivers during daylight hours. DRL are
required on new vehicles sold in Canada.
The high beam headlights will come on at reduced brightness in daylight
when:
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 are on. This light means that only the DRL are on. When
you turn on your exterior lights, this light will go out.
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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