Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi wriglea, the first thing to try is to lock and unlock the car from the other door or from the trunk. See if that disables the alarm. If it does that would indicate a fault in the driver's door lock contact. If you still have trouble I can instruct you on how to disable the alarm. Let me know how you make out.
Your contact is part of the handle itself. The handle is easily removed for inspection. Just remove the end cap (119) covering the retaining screw (116), remove the screw and lift out the handle. You may need to slide the handle over in order to lift it out. I've attached a diagram. If you'd rather just disconnect the alarm the module is located under the passengers side floor in the footwell area behind the plastic panel. You can just disconnect the connectors to the module.