I can't help you with the radio problem but that dead battery, key retaining "feature" is standard on many GM products these days. No clue as to why, I can't really see it being any kind of benefit, it seems like it could be more of a security issue.
The bug seems to have surfaced around the same time as the introduction of the Passlock MRD ignition system.
My lock shop gets about 10 calls a month from people who have a dead battery and think that their ignition lock cylinder is shot and needs to be replaced.
What the hell were they thinking when they designed that locking system?
Nissan had a model that retained the key with a dead battery as well, something like the 92 Maxima, but at least that car had a hidden push button that you could depress to release the key if it got stuck.
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