theft deturant on 1996 cadi eldorado

What is your question?

My theft deturant light comes on car will not start. Used owners manual no help. Discnnected no help.This has is not first time, but in past a readout said wait three minutes and all was good not getting that read out this time. Help me out of things to do.

How long has your 1996 Cadillac Eldorado had this problem?

two days