GM Service Manual Online
For 1990-2009 cars only
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 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: The audio system is acquiring and processing audio and text data. No action is needed. This message should disappear shortly.

OFF AIR: This channel is not currently in service. Tune in to another channel.

CH UNAVAILABLE: 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.

RADIO ID: If tuned to channel 0, this message alternates with the XM™ Radio 8 digit radio ID label. This label is needed to activate the service.

CHECK XM TUNER: If this message does not clear within a short period of time, the receiver could have a fault. Consult with your dealer/retailer.