2009 GMC Acadia Owner's Manual - Page 226

3-104 Instrument Panel If a disc is in both the DVD slot and the CD slot the DVD/CD AUX button cycles between the two sources and does not indicate "No Aux Input Device". If a front auxiliary device is connected, the DVD/CD AUX button cycles through all available options, such as: DVD slot, CD slot, Front Auxiliary, and Rear Auxiliary (if available). See "Using the Auxiliary Input Jack(s)" later in this section, or "Audio/Video (A/V) Jacks" under, Rear Seat Entertainment (RSE) System on page 3-116 for more information. If a MP3/WMA is inserted into top DVD slot, the rear seat operator can turn on the video screen and use the remote control to navigate the CD (tracks only). XM Radio Messages XL (Explicit Language Channels): These channels, or any others, can be blocked at a customer's request, by calling 1-800-852-XMXM (9696). XM Updating: The encryption code in the receiver is being updated, and no action is required. This process should take no longer than 30 seconds. No XM Signal: The system is functioning correctly, but the vehicle is in a location that is blocking the XM™ signal. When the vehicle is moved into an open area, the signal should return. Loading XM: The audio system is acquiring and processing audio and text data. No action is needed. This message should disappear shortly. Channel Off Air: This channel is not currently in service. Tune in to another channel. Channel Unauth: This channel is blocked or cannot be received with your XM Subscription package. Channel Unavail: This previously assigned channel is no longer assigned. Tune to another station. If this station was one of the presets, choose another station for that preset button. No Artist Info: No artist information is available at this time on this channel. The system is working properly. No Title Info: No song title information is available at this time on this channel. The system is working properly.