Chevrolet 2003 Silverado Owner's Manual page 259

TRAF (Traffic): If TRAF appears on the display, the
tuned station broadcasts traffic announcements.
To receive the traffic announcement from the tuned
station, press this button. Brackets will be displayed
around TRAF and when a traffic announcement comes
on the tuned radio station you will hear it.
If the current tuned station does not broadcast traffic
announcements, press this button and the radio
will seek to a station that does. When the radio finds a
station that broadcasts traffic announcements, it will
stop and brackets will be displayed around TRAF. When
a traffic announcement comes on the tuned radio
station you will hear it. If no station is found, NO
TRAFFIC will appear on the display.
Radio Display
Message
XL (Explicit Language
Channels)
Updating
XM™ Radio Messages
Condition
XL on the radio display,
after the channel name,
indicates content with
explicit language.
Updating encryption
code
If the brackets are on the display and TRAF is not, you
can then press the TRAF button to remove the
brackets or use the TUNE knob or the SEEK arrows to
go to a station that supports traffic announcements.
If no station is found, NO TRAFFIC will appear on the
display.
Your radio will play the traffic announcement even if the
volume is muted or interrupt the play of a CD if the
last tuned station broadcasts traffic announcements.
This function does not apply to XM™ Satellite Radio
Service.
Action Required
These channels, or any others, can be blocked at a
customer's request, by calling 1-800-852-XMXM (9696).
The encryption code in your receiver is being updated, and
no action is required. This process should take no longer
than 30 seconds.
3-103