Buick 1994 LeSabre Owner's Manual page 101

Rear Seat Reading Lights (Option)
The light, the switch, and a coat hanger are above each
rear door. Slide the switch to turn the light on or off.
Your DRL works with a light sensor on top of the
instrument panel. Don't cover it up.
The low beam headlights will come on at reduced
brightness in daylight when:
Courtesy Lights
When any door is opened, several lights go on. They
make it easy for you to enter and leave the car. You also
can turn these lights on by sliding the panel light switch
to INT (Interior).
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.
0
The ignition is on,
0
The headlight switch is off, and
0
The transaxle is not in "P" (Park).
At dusk, the exterior lights will come on automatically
and the low beams will change
to
full brightness. At
dawn, the exterior lights will go out and the low beams
will change to the reduced brightness of DRL (if the
headlight switch is off).
99