Buick 2003 Century Owner's Manual page 124

Delayed Exit Lighting
This feature illuminates the interior for a period of time
after the ignition key is removed from the ignition.
The ignition must be off for delayed exit lighting to work.
When the ignition key is removed, interior illurnination will
activate and remain on until one of the following occurs:
The ignition is in RUN, or
the power door locks are activated, or
an illumination period of 25 seconds has elapsed.
If during the illumination period a door is opened, the
timed illumination period will be canceled and the interior
lamps will remain on.
Reading Lamps
The reading lamps are located on the underside of the
rearview mirror.
Use the button next to each lamp to turn them on and off.
Dome Lamp
The dome lamp will come on when you open a door.
Battery Rundown Protection
Your vehicle has a feature to help prevent you from
draining the battery in case you accidentally leave the
interior courtesy lamps, reading/map lamps, visor vanity
lamps, trunk lamp, underhood lamp or glove box
lamps on. If you leave any of these lamps on, they will
automatically turn off after 20 minutes, if the ignition
is in OFF. The lamps won't come back on again
until you do one of the following:
0
Turn the ignition on,
turn the exterior lamps control off, then on, or
open a door.
If your vehicle has less than 15 miles (25 km) on the
odometer, the battery saver will turn off the lamps after
only three minutes.
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