andylong

Just failed MOT for headlight washers fitted not working.

Strange symptom - when you push first time in ages you get one squirt and after that they don't work.

When pushing the button I can hear a relay activating but the motor doesn't run. Checking voltage at the pump it goes from 200mV or so to 0.0 when button activated.
So I suspect the relay - but where is it??? Can find nothing on the forum or in the workshop manual...

(I know I can get through by removing completely but I don't want to delete)

andylong

ok so by listening and feeling this is the puppy, bolted under the steering wheel more central than the main fusebox on the right.



anyone know the part number or a replacement source?

andylong

...inside:

andylong

hmmm. on closer inspection it looks like there's a momentary jump to 12v and then drops to zero which would be consistent with this relay unit being the thing that gives us the normal 2 seconds of spray then cuts out even if you keep the washer held down.

back to the pump and giving it 12v straight from the battery doesn't spin it so prime suspect is now the pump and ill take it out and replace...

noodels

Car still starting up ? doesn't look correct

jayok

That looks like your traditional time delay relay circuit, with the transistors, capacitors, resistors, etc all lined up for it. (e.g. 12V Time Delay Relay Circuit). So the 2 seconds of on power for the pump and then cut, would happen in here. Perhaps, you're not seeing the 2 seconds on +12V as I find that multi-meters often sample too low to detect rapid changes. You could be better to test it by connecting a 12V bulb to just before the pump. That was you would see it flash for the 2 seconds?

andylong

yep, when you pull it you don't get the relay click from the washer button anymore - everything else fine

I think you're right - I could see a flash of 12v on the meter when i tried again. Generic pump should be here today to bodge in instead...