Toyota Lexusc Owner's Handbook Manual page 367

AUDIO
(b) Using the controller
To use the rear seat entertainment system controller,
direct the signal output portion of the controller to the
signal reception portion of the rear seat entertainment
system display.
The controller does not operate properly when the signal
reception portion of the display is exposed to direct sunlight.
Block the display from direct sunlight.
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CAUTION
To reduce the chance of injury in case of an accident or
a sudden stop while driving, stow the controller in the
console box or front seatback pocket when it is not in
use.