Chevrolet 2007 TrailBlazer Owner's Manua page 255

BAND (AF – Alternate Frequency): Alternate
frequency lets the radio switch to a stronger
station with the same program type. To turn
alternate frequency on, press and hold BAND
for two seconds. A 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.
RDS Messages
ALERT!: Alert warns of local or national
emergencies. When an alert announcement
comes on the current radio station, ALERT!
displays. You will hear the announcement,
even if the volume is low or a CD is playing.
If a CD is playing, play stops during the
announcement. Alert announcements cannot
be turned off.
ALERT! is not affected by tests of the emergency
broadcast system. This feature is not supported
by all RDS stations.
INFO (Information): If the current station has
a message, the information symbol displays.
Press this button to see the message. The
message can display the artist, song title,
call in phone numbers, etc.
If the entire message is not displayed, parts of
the message appears every three seconds.
To scroll through the message, press and release
the INFO button. A new group of words display
after every press of this button. Once the complete
message has displayed, the information symbol
disappears from the display until another new
message is received. The last message can
be displayed by pressing the INFO button. The
last message can be viewed until a new message
is received or you tune to a different station.
When a message is not available from a station,
No Info displays.
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