TOYOTA 2011 4Runner - Manual (Page 256)

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2-4. Using other driving systems
AUTO LSD system (2WD models)
The AUTO LSD system aids traction by using the traction control
system to control engine performance and braking when one of the
rear wheels begins to spin.
The system should be used only when wheel spinning occurs in a
ditch or rough surface.
■ System operation
Press the VSC off switch to
turn on the system.
At this time, the “AUTO LSD”
and VSC off indicators will
come on.
To turn off the system, press
the switch again.