Garage205man. I think the first check ought to be on the windscreen wiper motor mounted parking switch contact and its wiring which is shown in the diagram provided by Dave.The previous owner might have put a permanent short across this contact to get the wipers to work.
If the relay was down the motor would not run at all.
I have the same problem: started with the itermittent going crazy, and now there are only two speeds, and the wipers park wherever they happen to be. Have got used to it, but need a new MOT and this will cause it to fail. Please let me know if you get it fixed! Edited by: JPC
Took it in to today: they also figure it's the motor (they've seen it in other chevrolet/vauxhauls -- though this isn't exactly one of those). They said the bearings on these motors sometimes go and they don't park themselves properly. Costs about £180 to replace motor (they have to order it so it will be a few days). If the 'intelligence' is in the motor, that makes sense. Was worried that it was all handled by the ECU sending signals to the relay, but that requires quite a bit of to and frodata exchange, knowing where the wiper is at any moment, and I suspect that the wiper doesn't 'know' this electronically but only physically. If the wiper motor has a way to park itself, this seems a simpler solution . . . or at least I hope so.
Strangely, yesterday after baking in the sun all day, the wipers suddenly worked properly for the first time in 8 months or so (even the intermittent worked) . Given the expansion that must have occurred in the heat, this reinforces the motor theory. Presumably the ECU doesn't care....
It means they will go back to the normal position as opposed to being stuck in the middle of the windscreen mate. At the moment mine will not work on intermitting and when you switch off they will stay in the middle or rather where ever they stop unless u manually use the controler to stop them when they are at the bottome of the screen.
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