OK - this is a follow on from my previous post. Having removed the motor I have examined it carefully for problems. The trouble is I can't work out how it works - neither Haynes nor Porter's wiring diagrams are much help.


The motor has 3 states - Parked; Intermittent; Continuous (I think they are both probably 'fast').


Yet it effectively has only two wires going into it plus earth. Five pins - black (earth); empty; white/red; white; orange (the white might be pale blue). But the white/red and white pins are joined internally, so they count as only one. 3 states but only 2 control wires, one of which must be the continuous supply for the 'park' function. How does it do it?

Is there a relay controlling it?

It has an internal relay controlled by some electronics, which I took to simply be the on-off of the intermittent setting - perhaps it is more subtle. There is no external relay between it and the stalk switches.

OK - problem solved.


I still don't understand how it works but:


Symptom: wipers won't work when engine cold but start working after engine warmed up. Eventually stop working altogether.
Cause: Cracked connection on printed circuit board (not very obvious).
Reason: Stress fracture after 23 years of relay operating.
Solution: Re-solder connection

Nice one. Maybe it was a 'dry joint' when the solder cracks from heating and cooling repeatedly

Circuit board has two relays that are controlled by two +12v wires to give 3 combinations?
A or B. A+B.
Digital logic......?
Just guessing as have not seen one.

There is only one relay, but agreed it must be something like that.