Toyota Land Cruiser Prado Owner's Manual page 129

3-1. Using off-road driving systems
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The center differential lock/unlock switch can be operated when
The "ENGINE START STOP" switch is in IGNITION ON mode.
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The center differential lock indicator light
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The indicator light blinks while locking/unlocking the center differential.
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If the center differential lock indicator light blinks and the buzzer sounds
when the center differential is locked, stop the slipping or spinning and
push the switch again.
If the indicator continue to blink even if doing so, have the vehicle inspected
by your Toyota dealer as soon as possible. There may be a trouble in the
four-wheel drive system.
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Locking/unlocking the center differential
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When the four-wheel drive control switch is in L4 with the center differen-
tial locked, VSC is automatically turned off. (The center differential lock
and VSC OFF indicator light will come on.)
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If the operation is not completed, the center differential lock indicator
blinks. If the indicator light does not turn off when unlocking the center
differential, drive straight ahead while accelerating or decelerating, or
drive in reverse.
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Avoid turning suddenly while the center differential is locked. If you do
turn suddenly, the difference in turning speeds between the front and rear
wheels may have a similar effect to braking, thus making driving difficult.
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