Why won't my BMW 328i lock and why is the battery draining? What switch or relay might be malfunctioning?

Question:
On two occasions now (both when it's been very cold), my remote has refused to lock the car. I do get 3 chirps to indicate it hasn't locked, which tells me the remote battery is fine. (Usually 3 chirps means there is a door/hood/trunk ajar.)

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Last time this happened, the battery slowly drained as well. The problem turned out to be that the hood contact switch was stuck--an easy fix. Now I'm having the same problem again (doors won't lock w/remote, getting the 3 chirps) but the hood switch seems to be fine. I didn't notice the problem until I opened the trunk (for the second time) today; when I closed it and then tried to lock the car with the remote, it wouldn't lock. I pressed the trunk switch several times and it seems to be working properly.

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I'm thinking a switch or relay must be malfunctioning somewhere...any ideas of what I could test next, or where the problem might be?

Answers:

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do the locks lock, then pop up, or do they not move at all?
ive been searching my bmw forums, and it seems that there are two causes of this.
if they pop down then pop back up, its due to a faulty central locking unit.
however, when the car arms, but doesnt lock, this has to do with bad wiring in the trunk of an e36. It causes a short, and the central locking cant read that the a signal was sent.
http://forums.bimmerforums.com/forum/sho...

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heres an overview for the fix
http://forums.bimmerforums.com/forum/sho...

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have the alternator checked, it might be getting weak
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