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I dont know in the Lexus but in a previous car I had it mean that the brake fluid was low it makes sense since u saying it goes on when u turn quickly it can be the fluid goes to the side and triggers the sensor check it out just in case
I've had the same thing happen (not with my IS though) and it ended up being the brake fluid which was low. I'm betting it's what Albis350 suggested as well.
I dont know in the Lexus but in a previous car I had it mean that the brake fluid was low it makes sense since u saying it goes on when u turn quickly it can be the fluid goes to the side and triggers the sensor check it out just in case