Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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It sounds like a dead/possibly bad battery to me. Do you have a multimeter?
Yes. Once the voltage gets low it will make the different modules (in your case the security module) go haywire even though it still has plenty of current in it to keep running accessorys.. its just supplying the current at a lower voltage.
If you got a charger try charging it.. or you can try jump starting it if you got GOOD cables or just pull the battery out and take it to a parts store to charge and load test if you have another vehicle to take the battery with.
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