Hi, i have an ML320 2000, since two days ago the alarm goes off by itself and also the ceilling lights stay on, even after the car is turned on and i have to turn them off manually.
please tell me what i should do? should i disconnect and reconnect the battery or what? thanks

Only thing I can think of is door jam switch failing on you.

It has to be either a short in one of the door jam switches or a short somewhere in one of the wires. I would start with visually inspecting all four of the switches, I dont think it would be the back lift gate because you said that the courtesy lights stay on, not the cargo lamp. Maybe you accidentally closed the door with something in the way and broke or pinched a wire. This happened on my friends BMW 750...he didnt know it was the door switch because he always left his courtesy lights off. We noticed the nipple of the door jam switch had broken off and was not being pushed in....this tricked the alarm into thinking the door was being opened, and the alarm would go off.

__________________
1994 S320
131K miles

1998 ML 320
126K miles

1994 Blue C220
122K miles

Im going to Grad School @ the University of Iowa
Go Hawkeyes!!!

chona,
the history of alarm activation is stored in the aam. The history can be reviewed via star diagnosis system. Then diagnosis can begin.

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Paul