Cadillac: trouble codes, northstar, seville

Question
I have a 1995 Seville V-8 Northstar that won't start. It was running ok and then it wouldn't start.  How do I get the trouble codes? Is it through the AC.   Thanks

Answer
Simultaneously push and hold the OFF and WARMER buttons for 3 seconds and release them and let me know everything that appears on the screen EXACTLY as you see it, Write it down in the EXACT same order in which you see it no matter how many times the same thing appears.