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Hello, Eddie here and I will do all I can to help. It very well could be the cause, and since you have to slam it to get the light out that is what I suspect. An advanced type scanner capable of communicating with the alarm system will be able to read off alarm triggers that are stored in the module. So if adjusting the rear hatch doesn't help it, I would then have those codes read off and see what triggers are stored for the alarm. Until you read off what has triggered the alarm you are kind of guessing, but it sounds like the rear hatch would be most likely. If the alarm went off for awhile, then it could possibly contribute to the battery going dead. I believe those problems could be related. So I would get the alarm issue fixed first, and likely it would take care of the battery issue in the event the battery didn't need replacement anyway. Let me know if you have any further questions. Thank you.