Chevrolet 2003 Impala Owner's Manual page 190

Finding a PTY Station (RDS and XM™)
To select and find a desired PTY perform the following:
1. Press the P-TYPE knob. TYPE and a PTY will
appear on the display.
2. Select a category by turning the P-TYPE knob.
3. Once the desired category is displayed, press the
SEEK TYPE button to take you to the category's
first station.
4. If you want to go to another station within that
category and the category is displayed, press
the SEEK TYPE button once. If the category is not
displayed, press the SEEK TYPE button twice
to display the category and then to go to
another station.
If the radio cannot find the desired program type, NONE
will appear on the display and the radio will return to
the last station you were listening to.
3-68
BAND (Alternate Frequency): Alternate frequency
allows the radio to switch to a stronger station with the
same program type. Press and hold BAND for two
seconds to turn alternate frequency on. AF ON
will appear on the display. The radio may switch to
stronger stations. Press and hold BAND again for two
seconds to turn alternate frequency off. AF OFF
will appear on the display. The radio will not switch to
other stations.
This function does not apply for XM™ Satellite
Radio Service.