Your post is confusing. You keep mentioning brake AND tail lights. I am going to assume you really just mean BRAKE lights.

You state that "all three" are on - that is, the center brake light and both left and right brake lights are on. If THIS is the case, I'd suspect the brake light switch is bad. Every other car on the road has this switch mounted such that pushing the brake pedal activates it, so it has always been an easy switch to find. I ASSUME the Crossfire's brake light switch is mounted in a similar way - and that it's not activated by the pressure in the brake lines or some other silly-assed way.

I'd go looking for this switch, taking the trim out from under the dash is easy, you only need a phillips screwdriver for the 2 (or is it 3) screws under there. You can use an voltage probe light or digital/analog meter to see if this switch is switching.

If it is not the problem, looking at the diagrams of the car's wiring will tell you if the BCM is part of this chainn of events. I don't have time to look it up right now, but I strongly suspect you have a bad brake light switch or a low brake pedal - causing the switch to activate.