2008 Toyota Sienna - To
I will assume you have no owners manual,no one does
& refuse to buy one
No one, after 30 years of having any kind of malfunction
indicator lamps on the dash ,of all vehicles, seems
to remember what they did last time they got one
VSC & Trac are to some extent part of your ABS Braking
System as well as stability control systems & on & on
So you check for any active codes that set those dash lights
You -- meaning a repair shop
Then diagnose the areas of the systems they point you to
Then come up with a solution ,only after component testing,
because you never replace any parts until you know how they
work & that they failed
Long story short,you can not work on todays vehicles anymore
The pros can barely do that
So your off to a repair shop or if you enjoy questionable
results and have lots of disposible income, a dealer will
be happy to ruin that experience
