Windscreen washer pump

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markhowes
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The rear window washer has stopped working on my 463 G300. The front washer is fine.

It would help if I understood how the pump works as there are two outlets from the one pump - I assume that one outlet goes to the front windscreen and the other outlet goes to the rear.

But the pump only has two electrical connectors on the top so what causes the water to go to the rear rather than the front?

Is it that the pump works in reverse to feed the rear? Or is there a valve somewhere in the water circuits that stops water going to front or rear depending on which switch is operated?

Anyone know the answer?

 

Jdring
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Re: Windscreen washer pump

Oh, thats a good one.  I have simlar with a 460, and assume the pump might be the same.  I will dig around.

gav.helme
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Re: Windscreen washer pump

460 has seperate pumps for front and rear 

JASONGDS
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Re: Windscreen washer pump

The larger of the two pumps does the headlight washers, as far as I know the   smaller pump feeds the front and back windows, can you hear any pump running when you press the switch for the rear window?  

markhowes
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Re: Windscreen washer pump

I hear the pump running when the front washer operating but no pump running when I push the rear windsreen washer switch.

What I can't work out is how does the one pump operate both front and rear given that there are only two electrical connectors?

 

 

 

gav.helme
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Re: Windscreen washer pump

The switch when pressed gives power to the pump?

Be that front or rear

Might struggle if both are pressed together 

But you might struggle too!!
 

Still think it's the switch or wiring to it

markhowes
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Re: Windscreen washer pump

Thanks Gav.

It would help if I knew what was supposed to be happening. There are only two electrical connectors on the one pump so what makes the water go to the front or the rear?

Does the pump operate in two directions - so positive and negative elec feeds depend on which switch is operated)?

The pump is plastic and doesn't appear to be earthed (other than via one of the two connectors on the top)

Will have another go with the multimeter when the weather gets a bit better.

 

JASONGDS
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Re: Windscreen washer pump

I think that's the way it works, you could just swap the wires around see if rear washer works when you press front stalk?or use a multimeter and a assistant?