I dont know much about your particular vehicle, I'm a Chevy guy, but I'm guessing, when you disconnected the battery to replace it you re-booted something. If you had a code reader, you could probably get a read from the OBC - try disconnecting the battery again and see what happens..
This new stuff is so hard to diagnose without the right diagnostics - I'm sure the weather played a part in it's demise.
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