If you are a GM employee. You can use this online site for free.
http://service.gm.com/index_en-US.html
Simply use your GMID to log in. Same thing the dealer uses.
This site is also available on a daily rental thru ACDelco. It's up to date. EVERYTHING GM 1998 to current.
Logan Diagnostic LLC
www.ledfix.com www.airbagcrash.com www.logandieselusa.com