Driver's side rear taillight and signal not working

Hello,

There are 4 fuses that run the system that need to be checked first. here is a guide to help test the fuses and the fuse locations well with the turn signal wiring diagrams so you can see how the system works and which fuses to check:

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

If the fuses are good chances are the smart junction box (BCM) will need to be replaced which I have included instructions for as well. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.