Lexus GS430 User Manual page 272

TOUCH SCREEN
To register the one touch dial—
You can register the desired telephone number from
phone books, dialed numbers and received calls. Up to 17
one touch dial numbers a phone book can be registered.
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1. Touch the "Set One Touch" switch in which you want to
register the phone number.
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2. Touch the desired telephone number.
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Select the new registration from 1−18 except 6 and touch
the switch.
A latest received number is registered in the 6th item.