Lexus GS430 User Manual page 320

AUDIO
(c) Listening to the satellite radio
G22014
Push the "AM·SAT" button to choose a SAT channel.
Besides "AM", "SAT1", "SAT2" or "SAT3" appears on the
display.
296
G22010
Turn this knob to select the next or previous channel.
If you turn continuously, you can rapidly scroll forward or down
through the channels.