RAM 1500 Owner's Manual page 210

208 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
odometer, trip odometer, radio and overhead console by
rotating the control to the right until you hear a click. This
feature is termed the "Parade" mode and is useful when
headlights are required during the day.
Dimmer Control
Courtesy/Reading Lights
Both lights in the overhead console and rear passenger
compartment will illuminate as courtesy lights when a
door is opened, when the dimmer control is rotated to the
courtesy light position (full right position), or when the
UNLOCK button is pressed on the Remote Keyless Entry
(RKE) transmitter, if equipped. These lights are also
operated individually as reading lights by pressing on
the corresponding lens.