Here is a final update (this is for future people with an ICM issue..).
A new ICM fixed the brake light. In conclusion, here is how to verify a bad ICM quite easily. Disconnect the ground wire connected to the ICM module (typically a bullet style, should be able to pull apart). Touch the ground wire to any part of the chassis, and if the light turns on you have a bad ICM.
This works because CRF450x (2005-2014, at least) uses a ground interruption to turn on/off the tail light. If your ICM is bad, you have no ground.
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