Kusti

I have a 1998 MB W202 C200. There recently accured a problem where the indicators, horn, wiper, wiper washer, rear window heater and rear headrest lowering all stopped working at once. All the relays in the relay box in the front are making a clicking sound when they are turned on. The horn also does little "blips" but doesn't stay on. I already checked the relays in the front box and they should be okay and I don't think they would all go out at once. I also replaced fuse n. 41 which is connected to all of them but didn't help. I'm pretty sure my car has the newer model fuse and relay boxes due to it being a facelift. What could cause this and how could i fix it?