Pontiac Grand Prix 2007 Owner's Manual page 264

If both P-TYPE and TRAF are on, the radio
searches for stations with the selected PTY and
traffic announcements.
To use the PTY interrupt feature, press and hold
the P-TYPE button until a beep sounds on the
PTY you want to interrupt with. When selected, an
asterisk appears beside that PTY on the display.
You may select multiple interrupts, if desired.
When you are listening to a CD, the last selected
RDS station interrupts play, if that selected
program type format is broadcast.
SCAN: Scan the stations within a PTY by
performing the following:
1. Press the P-TYPE button to activate program
type select mode. P-TYPE and the last
selected PTY displays.
2. Turn the P-TYPE knob to select a PTY.
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3. Once the desired PTY is displayed, press and
hold either SCAN arrow, and the radio begins
scanning the stations in the PTY.
4. Press either SCAN arrow to stop at a station.
If both P-TYPE and TRAF are on, the radio
scans for stations with the selected PTY and traffic
announcements.
BAND (Alternate Frequency): Alternate
frequency allows the radio to switch to a stronger
station with the same program type. To turn
alternate frequency on, press and hold BAND for
two seconds. AF ON displays. The radio can
switch to stations with a stronger frequency.
To turn alternate frequency off, press and hold
BAND again for two seconds. AF OFF displays.
The radio does not switch to other stations.
This function does not apply for XM™ Satellite
Radio Service.