2006 Chevrolet Avalanche Owner's Manual - Page 250

Radio Messages CAL ERR (Calibration Error): The audio system has been calibrated for your vehicle from the factory. If CAL ERR appears on the display, it means that the radio has not been configured properly for the vehicle and must be returned to your GM dealer for service. LOCKED: This message is displayed when the THEFTLOCK® system has locked up. Take the vehicle to your GM dealer for service. If any error occurs repeatedly, or if an error cannot be corrected, contact your GM dealer. XM™ Radio Messages Radio Display Message XL (Explicit Language Channels) Condition XL on the radio display, after the channel name, indicates content with explicit language. Updating encryption code Action Required These channels, or any others, can be blocked at a customer's request, by calling 1-800-852-XMXM (9696). Updating The encryption code in the receiver is being updated, and no action is required. This process should take no longer than 30 seconds. The system is functioning correctly, but the vehicle is in a location that is blocking the XM™ signal. When you move into an open area, the signal should return. The audio system is acquiring and processing audio and text data. No action is needed. This message should disappear shortly. This channel is not currently in service. Tune to another channel. No Signal Loss of signal Loading XM Acquiring channel audio (after 4 second delay) Channel not in service CH Off Air 3-84