Cadillac 1993 DeVille Owners Literature page 119

To operate it,
leave the light switch off and move the Twilight Sentinel
control to any position but "OFE"
If you move the control all the way to MAX, your lights will remain on for
three minutes after you turn off your engine. If you move the control
almost all the way in the other direction, so it's just on, the lights will go
off quickly when you turn off your engine.
You can change this delay time from only a few seconds to three minutes.
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Please don't cover the light sensor. It is located on the top of your
instrument panel.
If you cover the sensor,
it will read "dark" and
your lights will come
on.
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Day Time 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.
Your DRL work with a light sensor on top of the instrument panel. Don't
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cover it up.
The high beam headlights will come on at reduced brightness in daylight
when:
The ignition is on
The headlight switch is off, and
The transaxle is not in "P" (Park).
At dusk, the DRL will switch off and the exterior lights will come on
automatically. At dawn, the exterior lights will go out and the high beams
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