Chevrolet 2001 Express Van Owner's Manual page 167

Radio Calibration
Your audio system has been calibrated for your vehicle
from the factory. If CAL appears on the display it means
that your radio has not been configured properly for
your vehicle and must be returned to the dealership
for service.
LOC: This message is displayed when the
R
THEFTLOCK system has locked up. Your vehicle
must be returned to the dealership for service.
AM-FM Stereo with Cassette Tape and
Compact Disc Player with Radio Data
System (RDS) and Automatic Tone Control
(If Equipped)
Playing the Radio
PWR: Press this button to turn the system on and off.
VOL: Turn this knob clockwise to increase volume.
Turn it counterclockwise to decrease volume.
DISP: Press this button to display the clock with the
ignition off. Press this button to display an RDS station
frequency or program type when the radio is on.
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