Hi,
If the light will not turn off, even with the brake light switch disconnected, chances are you have a short to power. Basically, power is being supplied to the brake lights via an unknown power source.
I attached the entire schematic below for the exterior lighting system. To help, I highlighted all the wiring related to the brake lights.
Here is what I suggest. If the lights are on, first remove the fuse for the brake lights. It is in the vehicle, left side under dash. See pic 3 below for location.
If the lights refuse to turn off with fuse 16 removed, then remove one fuse at a time near that fuse while a helper watches to see if the lights turn off. If they do, then we need to focus on the circuit of the affected fuse.
Here is a link you may find helpful when testing wiring:
https://www.2carpros.com/articles/how-to-check-wiring
I hope this helps. Let me know if you have other questions.
Take care,
Joe
See pics below.
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Friday, July 16th, 2021 AT 9:32 PM