Lexus GS430 User Manual page 278

TOUCH SCREEN
Setting screen
1. Push the "INFO" button on the bezel to display the
"Information Menu" screen.
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2. Touch the "Screen Setting" switch.
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(a) Automatic transition
You can select a function that enables automatic return to
the navigation screen from the audio screen.
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Select the "ON" or "OFF" and then touch the "OK".
ON: The navigation screen automatically returns from the
audio or air conditioning screen 20 seconds after the end of
audio or air conditioning screen operation.
OFF: The audio or air conditioning screen remains on.