Brakes lights work but running taillights will not turn on?

There are 5 fuses that run the system here are three guides to help us fix the problem and I have included the blinker and running light wiring diagrams so you can see which fuses to test and how the system works.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

You might have a BCM that is out but to be sure, you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.