Hmmm... not too sure. I can tell you this:

I awoke one morning, about to run to the grocery, and found that I couldn't use the remote to unlock the doors. I unloked them with the key and heard a light, repetitive clicking inside. The overhead light wasn't on and the VX wouldn't start... just the clicking noise and the alarm light in the cabin was blinking with the clicking. I opened the hood and followed the clocking noise to the fuse box. I started pulling fuses and finally pulled the horn fuse... clicking stopped. I figured, somehow, the alarm had gone off lastnight and was on long enough to drain the battery or something. I jump the VX, then put the horn fuse back in, and everything has been normal since.

I'm still not sure what cause it, but it was strange.