My 2004 XLR was parked for a few months while connected to a battery tender. A couple of times I would enter the shop and find the lights flashing. I then disconnected the battery and left it sit. I purchased a new battery but can not enter the car except through the door release in the trunk. Key FOB batteries are good. I can get nothing on the DIC except if I turn on the headlights it displays the odometer, no FOB not detected message or anything else. I have tried FOB programing but upon turning key in trunk release 5 times nothing is displayed on DIC. No dealer around me seems to have a clue. Even tried the Chevy dealer and they told me they won't work on anything before 2005. Looking for suggestions where to start!!