Buick 2004 Rendezvous Owner's Manual page 244

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 if the
volume is low. Your radio will interrupt the play of a CD
if the last tuned station broadcasts traffic
announcements and the brackets are displayed.
Radio Display
Message
XL (Explicit Language
Channels)
Updating
No Signal
3-104
XM™ Radio Messages
Condition
XL on the radio display,
after the channel name,
indicates content with
explicit language.
Updating encryption
code
Loss of signal
This function does not apply to XM™ Satellite Radio
Service.
Radio Messages
CAL ERR (Calibration Error): This message is
displayed when the radio has not been calibrated
properly for the vehicle. You must return to the
dealership for service.
LOCKED: This message is displayed when the
®
THEFTLOCK system has locked up. You must
return to the dealership for 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.
Your system is functioning correctly, but you are in a
location that is blocking the XM signal. When you move
into an open area, the signal should return.