Ford Mercury Villager 1997 Owner's Manual page 87

Controls and Features
If the vehicle doors are not fully closed and the interior lamps
remain illuminated, they will eventually turn off automatically to
prevent the battery from becoming discharged. Lamps that
illuminate when the front doors and the sliding door are open
will turn off after approximately 30 minutes. Lamps that are
illuminated when the liftgate is open will turn off after
approximately 60 minutes.
Illuminated Entry System (If equipped)
If your vehicle is equipped with this option, the interior courtesy
lamps (footwell, stepwell, and dome lamps) will light when
either of the front doors or the sliding door is open. If you have
the optional Keyless Entry System the lamps will also light
whenever the remote keyless entry transmitter button is pressed.
There are stepwell lamps located near the sliding door
entrance and one on each front door. The footwell lamps are
located below the instrument panel near the driver's and front
passenger's feet. When the liftgate is opened, the optional liftgate
lamp, rear dome lamp and sliding door stepwell lamp will
illuminate.
The lamps that have the delay feature will automatically dim
until they turn completely off approximately 15 seconds after the
doors are closed. When the key is placed in the ignition and
turned to the ON position, the lamps will turn off.
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