Ik I posted it before but I checked the battery and alternator and they are fine, and I scanned my car and no codes pop up. And when the weather is cold outside all the lights are off.
its an 2006 gs300

 

And my brake light is on too

 

Brake actuator/pump?

 

I think you may just have a bad wheel speed sensor. These sensors measure the mph of each wheel, and theyre located inside the wheel hub. A bad sensor would make the traction control go crazy, when you brake the abs will go nuts aswell, etc.

You can inspect your sensors, try disconnecting them and reconnecting them. You might get lucky and find corrosion in the terminal. But you need a good scan tool that can measure the wheel speed mph from each sensor. This will tell you if you have an issue, because a wheels sensor will be offline or throwing out a bunch of crazy numbers.

 

Thats rare on a gs300, as they run the gs350 style abs system. Unlike the 430/450/460

 

Doesn't have one.

 

Ah cool! Good to know.