Toyota Land Cruiser Prado Owner's Manual page 133

3-1. Using off-road driving systems
CAUTION
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When using the rear differential lock system
Failure to observe the following precautions may result in an accident.
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Do not lock the rear differential in the conditions other than above.
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Do not lock the rear differential until the wheels have stopped spinning.
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Do not drive over 8 km/h (5 mph) when the differential is locked.
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Do not keep driving with the differential lock switch on.
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