Chevrolet 2002 Impala Owner's Manual page 194

TRAF (Traffic): Press this button to receive traffic
announcements. If the current station does not broadcast
traffic announcements, the radio will seek to a station
that does. The traffic symbol will flash on the display.
When the radio finds a station that broadcasts traffic
announcements, it will stop. If no station is found,
NO TRAF will appear on the display.
Your radio can be programmed to interrupt the playback
of a CD or FM station by enabling the traffic interrupt
feature. Press the TRAF button once to seek to an RDS
station that supports the traffic interrupt feature if the
current station does not. The traffic symbol will flash
on the display when seeking for a station that supports
traffic interrupt. When the traffic interrupt feature is on,
TRAF will appear on the display.
When a traffic announcement comes on the current
radio station, you will hear it, even if the volume is
muted or a compact disc is playing. The traffic symbol
and TRAFFIC will appear on the display while the
traffic announcement plays. If the compact disc player
was being used, the compact disc will stay in the player
and resume play at the point where it stopped.
3-22
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
R
THEFTLOCK system has locked up. You must
return to the dealership for service.
If any error occurs repeatedly or if an error can't be
corrected, contact your dealer.
Playing a Compact Disc
Insert a disc partway into the slot, label side up.
The player will pull it in and the disc should begin
playing. The display will show the CD symbol.
If you want to insert a compact disc with the ignition
off, first press DISP or EJT.
If an error appears on the display, see "Compact Disc
Messages" later in this section.