1998 c230 alarm will arm itself
 

I have a funny problem with my 1998 c230. The alarm will arm between when I get into the car and before I can get the key into the ignition. The alarm will sound before I can get the key into the ignition and the doors will lock themselves. I have to open the locks from the key remote to get the alarm to stop sounding off. The alarm will also set itself when the trunk is moved. If the trunk is open and you move it closed the alarm will arm itself locking all the doors. You do not even have to close the trunk all the way for it to arm the alarm. Any help in diagnosing this problem will be apreciated. Thanks John