Mercedes Benz repair: Alarm 420sel, key lock, factory alarm system

Question
My alarm constantly goes off while I am driving my car. I have a 86 420sel. It really happens when the right side passenger door opens the front one. I goes crazy.  

Answer
Answer:
The right front door alarm switch or key lock is corroded = damaged.

Factory Alarm System Issues
http://www.mercedesshop.com/shopforum/showthread.php?p=1143583

Door LOCK issues, link thread.
http://www.mercedesshop.com/shopforum/showthread.php?p=1214456

Inner Door Panel Removal DIY Links
http://www.mercedesshop.com/shopforum/showthread.php?t=150747