Already did a search on this, but just want to clarify a few things please.......
My wipers sometimes work on intermitent and sometimes don't. They also don't park properly when they do work. They work fine on normal and high speed settings.
Also they don't come on when I use the washers.
Now if it's the motor that's not a problem as I've repaired 3 motors on my 155's.
Also saw the relay mentioned and because the wipers don't work when I use the scooshers, I'm wondering if the multi-switch is suspect.
Hmm, it lal sounds like the usual judder type problem, the parking, intermittent, and washer setting all use the same bit of track. On my 145, this track wore through the metal to the PCB board beneath, I ended up using PCB repair pen to remake the contact.