Dome Light
The lights turn on when the front doors are opened if the headlight switch dimmer knob is turned fully up, or, if equipped, when the unlock button on the key fob is pressed.
The interior lamps are located in the center of the overhead console and consist of one large center light and four smaller reading lights. Each reading lamp can be turned on by pressing the lens. Slide the lens to turn the light off for a moment.

Dome Lights
When the door is open and the interior lights are on, turning the dimmer control knob fully down will turn off all interior lighting. This mode is also known as "Party Mode" because it allows the doors to remain open for a long time without discharging the vehicle battery.
Test yourself
A quick Jeep Wrangler quiz: every answer comes with an explanation and a link to the manual page.