Here's how you likely activate it:
* Tailgate Switch: The most common method. Opening the tailgate often activates a switch that turns on the light. Make sure the switch in the tailgate itself is working correctly. Check the bulb to ensure it's not burned out. Sometimes, the wiring to this switch can become loose or damaged.
* Dome Light Switch: The cargo area light might be part of the overall interior lighting circuit. Try the dome light switch (usually located near the overhead console or in the front passenger area) and see if the cargo light comes on with the other interior lights. There are typically positions for "On," "Off," and "Door." Sometimes the cargo light is only active in "Door" mode - that is the light only illuminates when a door is opened.
* Fuse: A blown fuse could also prevent the light from working. Check your owner's manual to find the appropriate fuse for the cargo area light or interior lights.
If none of these work, the problem could be a faulty bulb, a wiring issue, or a problem with the switch itself. You might need to consult a wiring diagram or have a mechanic inspect the system.