By chance, are the front parking lights and turn signals working? I'm asking because it could be a faulty ground.
Also, under the dash at the top of the brake pedal is the brake light switch. Make sure it isn't out of adjustment or stuck.
I attached the wiring schematics below for the exterior lighting for your review. These are everything but the headlamps. Also, here is a link you may find helpful.
Let me know what you find or if you have other questions.
See pics below. Note: The pics below came from one page. I had to cut it in half to make it readable for you. I did overlap them so you can follow from one to the next.
Images (Click to enlarge)
Friday, June 17th, 2022 AT 9:35 PM