Toyota Land Cruiser Prado Owner's Manual page 126

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Center differential lock/unlock switch
3-1. Using off-road driving systems
Lock the center differential
when your vehicle's wheels
get stuck in a ditch or when
driving on a slippery or bumpy
surface.
The center differential lock
indicator will come on.
Unlock the center differential
after the wheels have been
freed, or after moving to a flat,
non-slippery surface.
To unlock the center differen-
tial, push the switch again.
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