Lexus IS F 2012 Owner's Manual page 198

2-4. Using other driving systems
When the VSC/TRAC/hill-start assist control systems are operating
To disable TRAC and/or VSC
If the vehicle gets stuck in fresh snow or mud, TRAC and VSC may
reduce power from the engine to the wheels. You may need to turn the
system off to enable you to rock the vehicle in order to free it.
■ Turning off TRAC
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The slip indicator light flashes to
indicate that the VSC/TRAC/hill-
start assist control systems have
been engaged.
The stop lights and high mounted
stoplight turn on when the hill-start
assist control system is operating.
Quickly push and release the
switch to turn off TRAC.
The "TRAC OFF" indicator light
should come on.
Push the switch again to turn the
system back on.