I have a 95 deville concours with 58000 miles on it and i have noticed for about two weeks it has been slow about cranking, but has always cranked. This morning after driving some 20 miles to a resturaunt, we finished up and went to leave and the car would not crank. There were no lights on the instrument panel. I turned the ignition back to the Off position and tried again. The same thing occured except this time it displayed, wait 3 minutes and counted down 2 mins, to 1 min and the said, start car. I cranked the car up after this. Any ideas, bought the car used with no owner's manual. I had the oil changed and am only at 86% oil life before another.

 

Check battery and condition of cables. Wait 3 min may indicate VATS concern. Search posts lots of info out there