Lexus GS430 User Manual page 315

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Turn this knob to step up or down the frequency.
Your radio automatically changes to stereo reception when a
stereo broadcast is received. "ST" appears on the display. If
the signal becomes weak, the radio reduces the amount of
channel separation to prevent the weak signal from creating
noise. If the signal becomes extremely weak, the radio
switches from stereo to mono reception. In this case, "ST"
disappears from the display.
(b) Presetting a station
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1. Tune in the desired station.
2. Touch one of the station selector switches (1−6) and
hold it until a beep is heard. This sets the station to the
switch and the frequency appears on the switch.
Each switch can store AM, FM1 and FM2. To change the
preset station to a different one, follow the same procedure.
The preset station memory is cancelled when the power
source is interrupted by battery disconnection or a blown fuse.
AUDIO
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