Hello, on my S-Max, 2008, petrol 2.0 Duratorq, the windscreenwasher pump does not work. I just replaced it with new one, but still same issue.

I checked fuse F14 in the passenger fuse box,but it is ok. 

Any ideas /suggestions? 

Thanks!

Paul, Amsterdam, NL

 

Are both the front and the rear not working ?

1 hour ago, unofix said:

Are both the front and the rear not working ?

Hi, correct. And pump makes no sound.

 

I suspect it rotates CW for front screen, and CCW for back screen. Pump has 2 wires. So + and - change. So both wires must lead to the control box. 

Controller issue? 

Does this BCM suffer from the corrosion issue where water comes up the wiring from a failed pump?
If it does, check the plugs at BCM.
Has the old pump actually failed?
Was the socket of the old pump corroded/wet?

If not, check power available at fuse and wiring continuity and ability to supply power from BCM to pump.
If OK then switching signal from stalk to BCM?
Can any of this be investigated using Forscan?

Hi, 

The Body Control Module (BCM) is in the interior, in front of the passenger seat. So 'liquid from faulty pump' can not be cause. I doubt old pump was faulty. No corrosion on the connectors.

Fuse has 12V on it (fuse pins measured against ground of car).

Wires are very difficult to inspect, did not see damage close to pump at least.

Replace BCM? 

 

2 hours ago, Paul van der Zande said:

So 'liquid from faulty pump' can not be cause.

Believe it or not, it has wrecked a few BCM's in it's time:
https://www.youtube.com/watch?v=eYGlM1gYzuc

I certainly wouldn't replace BCM until everything else had been ruled out (do you know the price of that bit and the likely need to reprogram it?)
As said, despite any difficulties the switch plus wiring from stalk and to pump from BCM would be my option before changing any parts by just guessing?

I'd stick a 12V bulb at the pump and remove connector and apply 12V to the corresponding wires for that end?
Then, as said look to see if state of switch can be registered in Forscan.
Other's may come back with their views and a magic fix, hopefully!

2 hours ago, Paul van der Zande said:

The Body Control Module (BCM) is in the interior, in front of the passenger seat. So 'liquid from faulty pump' can not be cause. I doubt old pump was faulty. No corrosion on the connectors.

Fuse has 12V on it (fuse pins measured against ground of car).

Wires are very difficult to inspect, did not see damage close to pump at least.

Replace BCM

Things are getting a little confused here.

On a 2008 S-Max it is likely to have a GEM and not a BCM, but either way that's not important.

Water ingress to the GEM or BCM is a common problem on some models, mostly the 2011 - 2014 Mondeo, but some others are affected. The screen wash pump on these models have a defective internal seal which allows water to travel along inside of the wire and it eventually makes it's way to the BCM and causes major damage.

Having said all of that, I doubt that this is the problem in the case of your S-Max. My thoughts would be that you possibly have a faulty wiper/washer stalk since neither the front or rear is operating.

Replacement of the GEM or BCM should only be considered as a last resort. It is both costly and to a degree complicated to replace.

You need to fully test the operation of the washer stalk before going any further.

When I press button for washer on front screen, I hear a 'click' in BCM. Same for pulling stalk towards steering wheel (rear washer). Again a 'click'.

Makes me feel connection from stalk to BCM is ok.

Would it be possible to identify which 2 wires exit the BCM to the pump? So to measure close to BCM?

Does a full wire diagram for s-max exist that can be read?

Thanks for the responses so far.

 

 

From that, at the moment, it looks like the stalk is working (good idea to listen for clicking relay?)
As @unofix states, it is likely to be a GEM (we don't want to get confused) so unless someone has  a wiring diagram available for that section, then I can only suggest finding wire colours at pump then looking  for same at the GEM OR seeing if the likes of Haynes (manual or perhaps better, Autofix?) has that information?
My Haynes gives this which is the best I can do (unsure if it matches your model as it only has a supply and earth - can you check?):

 

OR:

8 minutes ago, Shearers said:

My Haynes gives this which is the best I can do (unsure if it matches your model - can you check?):

As what often happens, the Haynes wiring diagram must be wrong for the model in question. If you check the wiring in the schematic you will see one side of the pump is permanently connected to chassis earth. That can't be correct for the OP's car as both wires from his pump will go to the GEM and the polarity will reverse depending on if the pump needs to run clockwise or anti-clockwise.

I've added the other washer pump wiring found - don't understand why there are two pumps on the same diagram Unless for different models?) but hope some of the colours match?

Edit: Full diagram attached - make of it what you can as the fuse numbers don't match but the colours and pin outs may?
Please let us know?

S-MAX WindhieldWasherWiring.pdf

5 minutes ago, Shearers said:

don't understand why there are two pumps on the same diagram

That's the correct schematic. One pump and Two relays 👍

Hi, I solved the issue. I put tape on the switch (stalk) to activate the pump. I removed the pump and measured voltage. I got 12V. Good. I reconnected the pump and well pressing connector and jerking the pump runs. It is a stupid matter of clean connector and well connecting.

 

Thanks for the support.

 

On 4/25/2025 at 12:53 PM, unofix said:

Are both the front and the rear not working ?

Hi, yes. Both were not working. I solved it replacing the pump. It turned out the connector was not firmly pressed on the pump. After that all was ok. Tested old pump, it was not rotating.

On 4/25/2025 at 12:53 PM, unofix said:

Are both the front and the rear not working ?