2011 GMC Canyon Regular Cab Owner's Manual - Page 163

Infotainment System CH Unavl: 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. Unauth: This channel is blocked or cannot be received with your XM Subscription package. No Info: No artist, song title, category, or text information is available at this time on this channel. The system is working properly. NotFound: No artist, song title, category, or text information is available at this time on this channel. The system is working properly. XM Lock: The XM receiver in your vehicle could have previously been in another vehicle. For security purposes, XM receivers cannot be swapped between vehicles. If this message is received after having your vehicle serviced, check with your dealer. Radio ID: If this message is received when tuned to channel 0, there could be a receiver fault. Consult with your dealer. Unknown: If this message is received when tuned to channel 0, there could be a receiver fault. Consult with your dealer. Check XM: If this message does not clear within a short period of time, the receiver could have a fault. Consult with your dealer. 7-13 AM The range for most AM stations is greater than for FM, especially at night. The longer range can cause station frequencies to interfere with each other. For better radio reception, most AM radio stations boost the power levels during the day, and then reduce these levels during the night. Static can also occur when things like storms and power lines interfere with radio reception. When this happens, try reducing the treble on the radio. Radio Reception Frequency interference and static can occur during normal radio reception if items such as cell phone chargers, vehicle convenience accessories, and external electronic devices are plugged into the accessory power outlet. If there is interference or static, unplug the item from the accessory power outlet. FM Stereo FM signals only reach about 16 to 65 km (10 to 40 miles). Although the radio has a built-in electronic circuit that automatically works to reduce interference, some static can occur, especially around tall buildings or hills, causing the sound to fade in and out.