Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question.
Unfortunately the chime is in the BCM which controls most of your electrical accessories and can only be disabled using a factory level scan tool.
If you can provide the vin number, I can pull the schematics and should be able to walk you thru testing and repairing the issue causing it to stay on