If just one of the lights is out, it's the bulb. Just push the little tab with a screwdriver or a butter knife and you can pop the bulb out. Then go get a replacement at a car parts store. I replaced both of mine with LEDs and they're much brighter. Here's the bulbs I used:

Amazon.com: AUXLIGHT 6418 6411 DE3425 C5W DE3423 36MM 1.42”Festoon Canbus Error Free LED Interior Light Bulbs 6000K Xenon White, Super Bright 6SMD Chips for Dome Map Door Courtesy License Plate Lights (Pack of 6) : Automotive

Buy AUXLIGHT 6418 6411 DE3425 C5W DE3423 36MM 1.42”Festoon Canbus Error Free LED Interior Light Bulbs 6000K Xenon White, Super Bright 6SMD Chips for Dome Map Door Courtesy License Plate Lights (Pack of 6): Courtesy Step Lights - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

WOW!! This is great, I'm sure I can even do it. Much thanks to you for your help!

 

I replaced both with fixed LED units instead of an LED bulb.

Example (check other for price compatibility):

Amazon.com: Mingrui test LED Luggage Trunk Lights car Interior lamp for Dodge Chrysler 200 Dart for J'eep Renegade Cherokee KL for Fiat 500 500X Car Storage Compartment Light Xenon White : Automotive


I found the originals are a pain to open up to replace the bulbs.

 

I replaced both with fixed LED units instead of an LED bulb.

Example (check other for price compatibility):

Amazon.com: Mingrui test LED Luggage Trunk Lights car Interior lamp for Dodge Chrysler 200 Dart for J'eep Renegade Cherokee KL for Fiat 500 500X Car Storage Compartment Light Xenon White : Automotive


I found the originals are a pain to open up to replace the bulbs.

Well, I guess that's what i'm going to have to do because the bulbs the previous reply said to buy are the completely wrong thing. I'm gonna need the whole unit instead. Thanks very much for the link!