2012 Chevrolet Corvette Owner's Manual - Page 200

7-10 Infotainment System XM Locked: The XM receiver in the vehicle may have previously been in another vehicle. For security purposes, XM receivers cannot be swapped between vehicles. If this message is received after having the vehicle serviced, check with your dealer. Radio ID: If tuned to channel 0, this message will alternate with the XM Radio eight‐digit radio ID label. This label is needed to activate the service. Unknown: If this message is received when tuned to channel 0, there may be a receiver fault. Consult with your dealer. Chk XMRcvr: If this message does not clear within a short period of time, the receiver may have a fault. Consult with your dealer. 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 mi). 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. XM™ Satellite Radio Service XM Satellite Radio Service gives digital radio reception from coast to coast in the 48 contiguous United States, and in Canada. Just as with FM, tall buildings or hills can interfere with satellite radio signals, causing the sound to fade in and out. In addition, traveling or standing under heavy foliage, bridges, garages, or tunnels may cause loss of the XM signal for a period of time. 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. Cellular Phone Usage Cellular phone usage may cause interference with the vehicle's radio. This interference may occur