Help please...I purchased my first Mercedes, a 1992 400SE, last summer when I moved to AZ. Just got it back from the shop after a week for AC repairs, was driving down the road when the alarm went off. So far, I've had it to three different locations - dealership, independent repair shop, and used MB dealer. All said they fixed it, but none have. One disconnected the horn, but the lights still flashed. Then someone disconnected the lights, but there's still a clicking. I'm not sure anyone here knows what to do...most of all me! Any advice would be greatly appreciated.