Lexus LS 600h L 2012 Owner's Manual page 364

Button lock function
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5-seat models
4-seat models
3-2. Using the air conditioning system and defogger
To prevent inadvertent operation, the buttons
on the rear armrest can be locked. Press
"MODE" until you hear a beep to lock the
buttons. Pressing "MODE" again until you
hear a beep will release the lock.
The indicator appears on the display when
the buttons are locked.
To prevent inadvertent operation, the buttons
on the rear armrest can be locked. Press
"MODE" until you hear a beep to lock the
buttons. Pressing "MODE" again until you
hear a beep will release the lock.
The indicator appears on the display when
the buttons are locked.
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