NISSAN 2012 Xterra - Owner's Manual - Manual (Page 128)

The cargo light on the overhead trim has a three-
position switch. To operate, push the switch to
the desired position.
ON: The light is illuminated.
Normal (center) position: The light illuminates
when the lift gate is opened. The light turns off
when the lift gate is closed.
OFF: The light does not illuminate regardless of
door position or lock status.
LIC0590
CARGO LIGHT
Instruments and controls 2-49