GMC 2003 Savana Van Owner's Manual page 136

Dome Lamp Override
You can use the dome
override button, located
below the exterior
lamps knob, to set the
dome lamps to come on
automatically when a
door is opened, or
to remain
off.
To turn the lamps off press the button. The dome lamps
will remain off when a door is open. To return the
lamps to automatic operation, press the button again.
The dome lamps will come on when you open a
door. This will override the illuminated entry feature
unless you use your keyless entry transmitter to unlock
the vehicle.
Exit Lighting
With exit lighting, the interior lamps will come on for a
period of forty seconds when you remove the key
from the ignition. The lights will not come on if the dome
override button is pressed in.
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