Hummer 2003 H2 Owner's Manual page 208

The old message can be displayed by pressing the
INFO button until a new message is received or a
different station is tuned to.
When a message is not available from a station,
NO INFO will be displayed.
TRAF (Traffic): Press this button to seek to a station
that broadcasts traffic announcements. TRAF will
appear on the display. If no station is found, NO TRAF
will appear on the display.
When a traffic announcement comes on the current
station or on a related network station, you will hear it,
even if the volume is muted or a cassette tape or a
compact disc is playing. The traffic symbol and
TRAFFIC will appear on the display while the traffic
announcement plays. If the cassette tape or the compact
disc player is being used, play will stop during the
announcement.
3-16
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.
Playing a Cassette Tape
Your tape player is built to work best with tapes that are
up to 30 to 45 minutes long on each side. Tapes longer
than that are so thin they may not work well in this
player. The longer side with the tape visible should face
to the right. If the ignition is on, but the radio is off,
the tape can be inserted and will begin playing. A tape
symbol is shown on the display whenever a tape is
inserted. If you hear nothing but a garbled sound, the
tape may not be in squarely. Press the eject symbol to
remove the tape and start over.