2004 GMC Canyon Owner's Manual - Page 177

Radio Messages CAL ERR (Calibration Error): Your audio system has been calibrated for your vehicle from the factory. If CAL ERR appears on the display, it means that your radio has not been configured properly for your vehicle and must be returned to the dealer for service. LOCKED: This message is displayed when the THEFTLOCK® system has locked up. You must return to the dealer for service. As each new track starts to play, the track number will appear on the display. The CD player can play the small 8 cm single CDs with an adapter ring. Full-size CDs and the smaller CDs are loaded in the same manner. If playing a CD-R the sound quality may be reduced due to CD-R quality, the method of recording, the quality of the music that has been recorded, and the way the CD-R has been handled. You may experience an increase in skipping, difficulty in finding tracks and/or difficulty in loading and ejecting. If these problems occur try a known good CD. Do not add paper labels to CDs, they could get caught in the CD player. Do not play 3 inch CDs without a standard adapter CD. If an error appears on the display, see "CD Messages" later in this section. Playing a CD Insert a CD partway into the slot, label side up. The player will pull it in and the CD should begin playing. The CD symbol will appear on the display. If you want to insert a CD with the ignition off, first press the eject button or the DISPL knob. If you turn off the ignition or radio with a CD in the player, it will stay in the player. When you turn on the ignition or radio, the CD will start playing, where it stopped, if it was the last selected audio source. 3-53