My factory alarm went crazy on me too, but only when i unlock the trunk. the alarm isnt disabled when i unlock the car from the trunk, so i just dont do that anymore. the car alarm also has a separate horn from the one you use on the road, i disconnected that horn, but the lights still flash.

mostly id just like to thank you for mentioning that you can close the windows and roof with the key. ive driven this car for 6 years and never knew that. i thought that was only something that has recently been put in new cars.

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350