The XM radio (U2K option) is available on either of the new Sound Systems.
"The 2003 Avalanche offers XM Satellite Radio as an option on all models. XM radio features 100 coast-to-coast digital channels, including 71 music channels (more than 30 of them commercial free) from hip hop to opera, classical to country, bluegrass to blues and 29 channels of sports, talk, children's and entertainment programming. XM also brings to the vehicle, for the first time on radio, a diverse selection of 24-hour news sources previously available only in the home. XM's next-generation sound quality technology provides superior sound remarkably close to compact disc."
Be sure to check out all of the new information at:
2003 Dealer Marketing / Ordering Information
(S)
UBO ? NEW Sound system, ETR AM/FM stereo with CD player, includes seek-and-scan, digital clock, auto-tone control, speed-compensated volume, Radio Data System (RDS) and 6-speakers
1- Requires (AE7) Seats, front Custom Cloth 40/20/40 split bench.
(A)
UC6 - NEW Sound system, ETR AM/FM stereo with 6-disc CD changer, includes seek-and-scan, digital clock, auto tone control, Radio Data System (RDS) and Bose speaker system (includes 6-speakers, Bose amplifier and Bose Subwoofer)
1- Not available (AE7) Seats front Custom Cloth 40/20/40 split-bench
(A)
U2K - Sound system feature, satellite XM digital sound system (requires extra charge customer paid subscription)
1 - Not available in Alaska, Hawaii, Puerto Rico or the Virgin islands.