2004 GMC Sierra 1500 Pickup Owner's Manual - Page 260

XM™ Radio Messages (cont'd) Radio Display Message XM Locked Condition Theft lock active Action Required The XM receiver in your vehicle may have previously been in another vehicle. For security purposes, XM receivers cannot be swapped between vehicles. If you receive this message after having your vehicle serviced, check with the servicing facility. If you tune to channel 0, you will see this message alternating with your XM Radio 8 digit radio ID label. This label is needed to activate your service. If you receive this message when you tune to channel 0, you may have a receiver fault. Consult with your dealer. If this message does not clear within a short period of time, your receiver may have a fault. Consult with your retail location. is inserted. If you hear nothing, or hear a garbled sound, the tape may not be in squarely. Press the eject button to remove the tape and start over. While the tape is playing, use the VOL, AUDIO, and SEEK controls just as you do for the radio. TAPE will appear on the display and an arrow showing which side of the tape is playing. The tape player automatically begins playing the other side when it reaches the end of the tape. Radio ID Radio ID label (channel 0) Radio ID not known (should only be if hardware failure) Hardware failure Unknown Chk XMRcvr 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 will appear on the display whenever a tape 3-96