1) Diagnostics not available on Cadillac Catera, Pontiac Vibe, and Saab 9-3 and 9-5. Diagnostic services vary on Cadillac SRX V8; Saturn VUE, ASTRA, ION and L-Series; Chevy Silverado diesel; and GMC Sierra diesel. For details, call 1-888-4-ONSTAR (1-888-466-7827) or press your blue button.

2) XM Radio requires a subscription, sold separately by XM after the first 90 days. XM Radio U.S. service only available in the 48 contiguous United States and the District of Columbia. For more information, visit gm.xmradio.com