TOYOTA 2011 4Runner - Manual (Page 250)

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2-4. Using other driving systems
Four-wheel drive system (full-time 4WD models)
Use the four-wheel drive control switch to select the following trans-
fer modes:
H4F (high speed position)
Normal driving on all types of roads.
H4L (high speed position, center differential locked)
For when your vehicle’s wheel gets stuck in a ditch or when you are
driving on a slippery or bumpy surface.
L4L (low speed position, center differential locked)
For driving requiring maximum power and traction such as climbing or
descending steep hills, off-road driving and hard pulling in sand or mud,
etc.
Center differential lock indicator
Low speed four-wheel drive indicator
CTH24AS016