Chevrolet 1995 Lumina Owner's Manual page 91

Battery Saver
Your vehicle has a feature to help prevent you from
draining the battery, in case you accidentally leave the
courtesy lamps on.
If
you leave the dial turned all the
way up, or if you leave a door open, the lamps will
automatically turn off after 10 minutes if the ignition
is off.
If you open a door, the lamps will stay on while it's open
and then turn off automatically about 18 seconds after
you close it. If you don't open a door, the lamps will
turn off after about 18 seconds, unless you pressed
UNLOCK on the Remote Lock Control. If you pressed
UNLOCK and don't open a door, the lamps will turn off
after about 55 seconds.
This feature will not turn off the reading lamps, only
the lamps controlled by the dial. Be sure to turn off
any reading lamps using the switch before you leave
the vehicle.
Sustained Interior Illumination
Your courtesy lamps will come on and stay on for a set
time whenever you:
Open a door.
Press UNLOCK on the Remote Lock Control
(if equipped).
(if equipped).
Press DOOR on the Remote Lock Control
Sustained interior illumination includes a feature called
theater dimming. With theater dimming, the lamps don't
just turn off at the end of the delay time. Instead, they
slowly dim during the delay time until they go out. The
delay time is cancelled if you turn the ignition key to
RUN or START, so the lamps will go out right away.
When the ignition is on, Sustained Interior Illumination is
inactive, which means the courtesy lamps won't come on.
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