'02 Town & Country alarm problem

The alarm of a family member's 2002 Town & Country keeps going off, sometimes even during the night and disturbing the neighbors.
The immediate remedy is to disconnect the battery overnight, but that's hardly a long-term solution.
I have a code scanner, but I don't know whether an alarm problem is going to register in the scanner, and in any case, if the battery has been disconnected, I assume that any stored codes would have gone away.
The possibilities that occur to me are (a) a faulty door switch, and (b) an intermittently closing contact in the Panic button on one of the remotes. Are they possibilities, and is there anything else we should look at?
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