what is vsc system
You will have to get the error codes read. That's the only way to narrow down the problem. Here is a link with a short video on the VSC system... http://www.toyota- global.com/innovation/safety_technology/safety_technology/technolog y_file/active/vsc.html
Link may be too long to work. Just Google VSC system. Plenty of explanations on what it's all about. Many things can make the light come on as far as error codes.
vehicle stability control.
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