Any help here would be greatly appreciated. 

I have a 63 plate Mondeo estate and the screen washers aren’t working. It’s in at my local garage and I’ve just spoken to them and they seem to thinks it’s an electrical fault. You can here the relay when you press the button they are saying something about a board?????

The screen wash pump is controlled by the 'Body Control Module' (BCM) which is part of the passenger side fusebox.

The replacement of the BCM is expensive !!!!!!!!!!!

Is there no 'Front' / 'Back' / 'Both' screen wash ? If you listen outside the car next to the screen wash tank can you hear the pump motor when the screen wash is operated ?

I cannot here the pump from the outside, from inside I can hear a clicking noise down by the fuse box on the passengers side below glovebox. 

you need to get the pump out and test the connections and the pump it's self.

Ok bud, you got a number I can possibly call you on. 

Right i have the car back from the garage, there seems to be no power from the fuse to the pump, fuse is ok and so is the relay so I've been told by the garage. I now have the car back with but problem is still there, apparently i need an auto electrician, many around my area seem to be fully booked up till the middle of March.

There could be a break in the wire if you have no power from the fuse/relay to the pump, I have in the past run a separate wire external to give power to the pump to prove then after starting from one end like the pump on the original wire to find where the break is and to solder it together again

Hello Andy, do you have a multimeter and can you carry out some tests ?

I can talk you through what to measure and at which points if you want to try fault finding.

If it is a fault in one of the cables the better option may be to just bypass the circuits with fresh wiring instead of making several cuts into the original ones trying to find the actual break.

Especially applies if the wiring has gotten corrosion in there - seen by the inner cores not being shiny copper coloured any more but gone a dull brown which I found on an extra loom I’d made up for dual reverse and fog lamps, despite using decent sealed connectors etc 

Thanks all for the replies, the garage have been in touch with me tonight and I'm taking it back in Thursday morning for someone an Auto Electrician to look at.

3 hours ago, unofix said:

Hello Andy, do you have a multimeter and can you carry out some tests ?

I can talk you through what to measure and at which points if you want to try fault finding.

 Yes i do have one to hand fella.

OK ---- Then you're good to go !!!

As you probably know there is only one screen was pump which does both the Front and Back screens. It is fed by fuses "F9" and "F10"

There is no constant negative or constant positive supplied to the pump, instead the wires from the fuses are used to supply one positive and one negative which get swapped the other way round depending if it is the front or rear screen that needs washing.

Using a meter connect the positive lead to the positive terminal of the battery. With the ignition on, use the negative lead of the meter and connect it to the test point on fuse F9. It should read about 12V. Now move the negative meter lead and test fuse F10. Again it should read 12V.

Now get someone to operate the front screen wash (keep it operating). Use the negative meter lead and again test fuse F9 and F10. One of those fuse should give you a reading of 12V and the other will be Zero.

Now get someone to operate the rear screen wash (keep it operating). Use the negative meter lead and again test fuse F9 and F10. The opposite fuse now should give you a reading of 12V and the other will be Zero.

If you get the results above then you have proved that the Body Control Module (BCM) is working correctly and that the relays inside are switching correctly.

So provided everything is as above the fault has to be either a break in one of the wires from a fuse to the pump, Or, the screen wash pump is dead.

If you get this far and want to carry on with the testing let me know.

Nice Fluke.....

it could be that you can hear the relay switching but because of a bad contact in the relay it does not power the pump so it might not be the wiring, check with what Unofix says and you should get somewhere.

Its a the garage, dropped it off earlier. I will update you fellas once i hear something.