Hi all, they also park ok and the wash works, but low and high speed don't come on. I've swapped the switch out for another junkyard part. Is it a bad switch or is there some fuse or relay that controls low and high speeds but not Intermittent speed? Wiring diagram doesn't seem to indicate that but nothing electric on this car makes much sense to me

 

Make sure the black wire from switch assembly is running to ground. A while since I've been into that part of the wiring but l recall that ground wire is separate from the multiplug and connects by way of simple bullet connector.

 

Looking at the diagram, I agree with Baxtor. The Intermittent mode gets it's ground elsewhere while slow and fast get it from that bullet connector. I think that bullet connector is <edit> in the corner on passenger side under hood.

Goes to Black Wire. Pin 2. Supply pin 2 with a ground to check that this is the problem.

<edit> I see now that there is a second bullet connector between the ground and the wiper motor. Possibly a dirty pin or pin contact, or broken lead after pin connector.

Fig.15.1 in s57 electrical diagrams.

 

VIN is very important here as the change in the wiper wiring is significant. To help you we need to know which version of the wiring to use so we will need the VIN to give you the correct information.