TOYOTA 2011 Yaris Sedan - Manual (Page 155)

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2-4. Using other driving systems
To disable TRAC and/or VSC
If the vehicle gets stuck in fresh snow or mud, TRAC or 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.
n TRAC OFF mode
Press the VSC OFF switch
briefly.
The TRAC OFF indicator will
come on.
The system is in TRAC off and
VSC on mode.
Push the switch again to turn the
system back on.