Chevrolet 2009 TrailBlazer, Owner'S Manual

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If both PTY and TRAF are on, the radio searches
for stations with the selected PTY and traffic
announcements.
If the radio cannot find the desired program type, NONE
displays and the radio returns to the last station.
BAND (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. 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.
Setting Preset PTYs (RDS Only)
For the Base Radio, pushbuttons have factory PTY
presets. Up to 12 PTYs (six FM1 and six FM2), can
be programmed on the six numbered pushbuttons,
by performing the following steps:
1. Press BAND to select FM1 or FM2.
2. Press the TYPE button to activate program type
select mode. P-TYPE and the last selected PTY
displays.
3. Turn the TYPE knob or press and release the
TYPE button to select a PTY.
4. Press and hold one of the six numbered
pushbuttons until a beep sounds. When that
numbered pushbutton is pressed (while in PTY
mode), the PTY that was set, returns.
5. Repeat the steps for each pushbutton.
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