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Hello, does the third brake light comeo n as well? Do you have a voltmeter so we can do some testing?
I apologize, I'm having trouble with my wiring diagram software, I will open this back up to other experts. Someone should be with you shortly.
Is your ABS light on as well? Are you saying the brake lights on the back of the car come on and stay on, like the brake switch is stuck on?
You may be able to pull faults from the system, a lot of large chain parts stores like Autozone will read faults for FREE if they have a system that will do more than just the engine codes (though sometimes faults like these will show up in multiple systems)