1986 BMW 325 wipers

There is a fuse box under hood, locate it and open the lid. There is a rectangular black module in there, it is the wiper control relay, it is likely to be the fault. It may also be the control stalk on the steering column. If the stalk seems funky, I would think jiggling it might snap it out of it's dilemma, otherwise check the relay module. If you need parts, call Autobahn BMW dismantling @ (619)444-2290 and speak to John or Sean. Ot's much cheaper than new at the dealer(stealer?)