Lexus LS460 Owners Book page 363

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.
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