Lexus LX 570 2009 Manual page 55

Jam protection function (vehicle with power back door)
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If anything obstructs the power back door while it is closing/opening, the back
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door will automatically operate in the opposite direction.
If the lower back door is opened while the upper back door is in a closing oper-
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ation, it automatically opens again.
If the power back door does not work
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The back door must be initialized. To initialize, close the back door completely by
hand.
Back door closer (vehicle with power back door)
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In the event that upper side and lower side of the back door are left slightly open,
the back door closer will automatically close it to the fully closed position.
Fall-down protection function (vehicle with power back door)
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While the power back door is opening automatically, applying excessive force to it
will stop the opening operation to prevent the power back door from rapidly falling
down.
Customization that can be configured at Lexus dealer
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Settings (e.g. switch operation) can be changed. (Customizable features P. 716)
CAUTION
Observe the following precautions. 
Failing to do so may result in death or serious injury.
While driving
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Keep the back door closed.
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This not only keeps personal belongings from being thrown out, but also prevents
exhaust gases from entering the vehicle.
Do not get on the rear step bumper.
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1-2. Opening, closing and locking the doors
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