2003 Chevrolet Monte Carlo Owner's Manual - Page 174

XMTMRadio Messages Radio Display Message XL (Explicit Language Channels) ~~ ~~ I Condition XL on the radio display, after the channel name, indicates content with explicit language. Updating encryption code Loss of signal 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 your receiver is being updated, and no action is required. This process should take no longer than 30 seconds. Your system is functioning correctly, but you are in a location that is blocking the XM signal. When you move into an open area, the sianal should return. message should No Sign1 after 4 second delay)textdata. No actionisneeded.This disappear shortly. 3-59