I have a 93 Mercedes 400E and it has the built in alarm system with electronic lock doors. Well the car will not start now; when I put the key in the driver side (any door) to lock it will now only lock one door not all the doors like before. When I put the key in the ignition nothing happens. I think it has something to do with the "alarm" system. I dont know if it is off track or needs a new fuse... I need suggestions as to how to get the car working or what the problem is. I do not think it is the battery. Pls help!