I have an 03 tl type S. rarely when it rains my alarm will go off randomly in the middle of the night. It happened about 6 months ago and went off about 4 times in one night. I thought it had something to do with me leaving the headlights on when I parked the car even though they shut off automatically and the alarm went off early in the morning and the last time I used my car was late afternoon. I leave my car outside so it does get rained on a lot and we have been getting rain a lot recently. Today I parked my car outside and left it with the lights turned off. I locked the doors and about an hour later the alarm went off. I got home today around 6pm and turned the lights off and locked the car. It hasn't rained since then. The alarm started going off around 5am this morning for no apparent reason. I checked it out to make sure all the doors were shut but the car did not beep as it usually does when the doors are locked. It was making a noise on the back passenger door (a door a open maybe once a month if that) and it seemed to sound like it was trying to lock but not. That door hasn't been used in forever. I tried locking the car and it still didnt beep. So I unlocked the car and left it like that hoping that would be the quick fix. I haven't heard the alarm yet but I do not want to leave my doors unlocked when I'm away for the car as I am taking a day trip somewhere tomorrow and will not be anywhere near my car. Any suggestions as to why this is happening and how I can fix it?