Nick, this can't possibly be one relay. Not being a wiz at some of MB's wiring, I would really start thinking about a chassis connector coming loose or having sustained a short or some kind of damage. You are having problems in a number of systems that are controlled by relays and timers. Has any work been done on the car recently? There has got to be a simple explanation for this one. I'll check my service wiring diagrams and get back to you. Maybe Benzmac has some clues or firsthand re this type of failure.