CHEVROLET 2010 Express - Manual (Page 162)

Dome Lamps
The dome lamps come on when any door is opened.
They turn off after all the doors are closed.
The dome lamps can also be turned on by turning the
instrument panel brightness knob, located on the
instrument panel to the left of the steering column,
clockwise to the farthest position. In this position, the
dome lamps remain on whether a door is opened
or closed.
Dome Lamp Override
The dome lamp override button is located next to the
exterior lamps control.
The dome lamp override sets the dome lamps to remain
off or come on automatically when a door is opened.
E (Dome Lamp Override): Press the button in and the
dome lamps remain off when a door is opened. Press the
button again to return it to the extended position so that
the dome lamps come on when a door is opened.
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