It's for better traction in the snow.
If your SC300 does not have the TRAC option, then it does not have traction control. But I know nothing about TRAC systems, so I couldn't tell you how to turn it on. :)
The Lexus GX 470 VSC trac light is on because your vehicle is experiencing electrical sensor issues. Take your Lexus to your auto body shop to remedy the problem.
If your engin light also is on, you need new oxigen sensors!
You need someone to retrieve the codes in order to further diagnos www.lextechautomotivellc.com
Have the ECU scanned with an OBD2 scan tool.
Bring to a shop that has an ABS scanner
Catalytic converters or oxygen sensors need replacing. Most likely you need to replace your catalytic convertor. That is what happened to me. It is getting too hot which makes your trac turn off to avoid damage.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
To reset the VSC TRAC light on a 2002 Lexus ES300, first, turn off the ignition. Then, disconnect the battery by removing the negative terminal for about 10-15 minutes. Reconnect the battery, start the vehicle, and the light should be reset. If the light persists, it may indicate an underlying issue that requires diagnostic evaluation.
Off
I had the same issue so I took it to Lexus for repairs. It seems that light comes on everytime there is a fuel issue rather than a traction issue. You could take it to an Advance Auto and have them pull the code from the computer and it will tell you the problem before you take it to Lexus or your favorite automotive shop. I believe the image they should be using instead of the trac off light is a dollar sign! Last time it went off it cost me 700 dollars.
Problem with the ABS.