Where is the brake light relay located

Hello,

There is no relay for the brake lights.
However, the brake does lights have a 15A fuse located in the fuse box under the dash (see diagram).

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

In operative brake light can also be due to a faulty brake light switch. The brake light switch is located under the brake pedal. When the pedal gets depressed, the switch gets pushed and the brake lights turn on. That switch can fail due to normal wear and tear.

Please let me know if you have any questions.
Thank you.