Toyota 4runner 2009 User Manual page 179

Limited slip center differential
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If one wheel begins to spin, the limited slip center differential (transfer) is
designed to aid traction by automatically transmitting driving force to the
wheels on the other drive axle. It transmits driving force to the front wheels if
a rear wheel spins, and to the rear wheels if a front wheel spins.
The center differential lock switch can be operated when
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The four-wheel drive control switch is in the H4 or L4 position.
Center differential lock system
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When the center differential is locked, the VSC system is automatically
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turned off and the center differential lock and VSC OFF indicators come
on.
When the four-wheel drive control switch is turned to the H2 position, the
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center differential is automatically unlocked.
If the operation is not completed, the center differential lock indicator
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blinks. If the indicator does not go off when unlocking the center differen-
tial, drive straight ahead while accelerating or decelerating, or drive in
reverse.
NOTICE
When shifting the four-wheel drive control switch
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Never operate the four-wheel drive control switch if the wheels are slipping.
Stop the slipping or spinning before shifting.
To prevent damage to the center differential
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l For normal driving on dry and hard surface roads, unlock the center differ-
ential.
Unlock the center differential after the wheels are out of the ditch or off the
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loose or bumpy surface.
Do not push the center differential lock switch when the vehicle is corner-
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ing or when its wheels are spinning freely off the ground.
2-4. Using other driving systems
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