Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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The Radio is always powered on. The BCM sends it a signal when key is turned on to turn on display. Do you have a scanner with BODY DATA. My suspicion is the BCM is not powering it down.
Here is a link to a scanner that would have the data you need inexpensively. Not professional grade but data that you would need if you are do it yourselfer. This one is GM specific. http://scantools.biz/blog/product/icarsoft-i900/ This is one more specific if you have multiple brands of cars http://scantools.biz/blog/product/icarsoft-crplus-multi-brand-scan-tool/
Best way is scanner. Maybe as simple as door not being seen open due to bad latch. Could be bad BCM. Could be bad radio.
Here is another choice I am confident has the body data you need to monitor. https://www.amazon.com/Autel-Maxidas-Automotive-Diagnostic-Multilanguage/dp/B01IP8M0K6/ref=sr_1_29?s=automotive&ie=UTF8&qid=1483405249&sr=1-29-spons&keywords=automotive+scanner&psc=1
This one is available at harbor freight. Be a good one to use a 25% off coupon if you can find one.