I would start by checking the taillights themselves. Sometimes the bulbs can have a short when the bulb contacts melt and touch ground. Please remove the bulbs to see what they look like this guide can help you.
https://www.2carpros.com/articles/no-tail-lights-exterior-running-lights-tail-lights-out
Here is how you can check for the problem yourself in the diagrams below. Check out the diagrams (below). Please let us know what happens. I also have included the wiring diagrams so you can see how the lighting system works.
Images (Click to enlarge)
May 27, 2022 at 4:39 PM