Hi everyone 

My washers have stop working and I have changed the washer stalk, fuse and pump but still no joy, not even a sound from the pump, any ideas?

Many thanks 

 

Ash

5 hours ago, aelwell997 said:

I have changed the washer stalk, fuse and pump

Body Control Module (BCM)

check for signs of water ingress and/or greenish corrosion of the connectors

Also - If you have access to Forscan, one of the PIDs (sensors) it can monitor should tell you whether the car's 'brain' is seeing your inputs via the washer stalk/button.

 

If it is, then at least you'd know that everything from the stalk to the BCM is working properly, so it could just be a break/fault in the wiring from the BSM to the pump itself.

On 9/5/2024 at 2:03 PM, FatHead1979 said:

Also - If you have access to Forscan, one of the PIDs (sensors) it can monitor should tell you whether the car's 'brain' is seeing your inputs via the washer stalk/button.

 

If it is, then at least you'd know that everything from the stalk to the BCM is working properly, so it could just be a break/fault in the wiring from the BSM to the pump itself.

Hi Everyone

Forscan definitely sees the line to BCM? I have a 2012 Fiesta. I also have a problem with the washer pump. When I remove the pump, the wipers work. In Forscan on my car there is only one parameter responsible for the washer. But when I press the button, Forscan does not see this. Even if the pump is removed and the wipers work.

Welcome!
 I don't fully understand but if removal of the pump allows the wipers to work, is the pump shorting out?
Otherwise you may need to check the actual wiring from the stalk to the BCM in case there is an issue with that (if I understand that part of the problem?)

1 hour ago, Shearers said:

Welcome!
 I don't fully understand but if removal of the pump allows the wipers to work, is the pump shorting out?
Otherwise you may need to check the actual wiring from the stalk to the BCM in case there is an issue with that (if I understand that part of the problem?)

The problem started when during a trip: when I turned on the washer, the wipers and the pump itself stopped working. In independent modes, the wipers work fine. I removed the washer pump and checked the line to the BCM, and it is normal. I removed the washer button from the steering wheel and rang with a multimeter. It shows that the button works. When I removed the pump and pressed the washer button, the wipers work. I ruled out a problem with the washer button. My assumption was that the problem was with the pump. I checked the pump with a multimeter for a resistance of 3 ohms. It looks like a short circuit in the pump and the BCM disconnected the circuit. I bought a new pump JL1Z17664A. It has a resistance of 11 ohms. In the end, this did not solve the problem. There are no errors in the BCM and never were. I launched the diagnostic mode in forscan, the wipers and washer with the pump connected also did not work, but this did not cause an error. Rebooting the BCM via forscan did not help. Then I checked the parameter for the washer in forscan. It does not see pressing the washer button with or without the pump connected. Then I checked the BCM for oxidation of the contacts and checked the board itself. I checked the resistance with a multimeter between the contacts that are designed to control the pump. Shows infinity, which means the key is not closed. Visually, the board and contacts are new. I sent a photo to the electronics store, and they said that there is no even minimal damage and do not know what can be checked there. Yesterday I saw that many people here had this problem and it was solved by replacing the washer button on the steering wheel. The multimeter can show that it is working properly, but in fact it does not work. Now I want to understand how to make sure that the button really works correctly or not, so as not to just pay $ 100 for a new washer button. I will be glad to any tips. Thank you very much.

It sounds like you have carried out a comprehensive set of tests that have not revealed a solution.

From what you say, on pressing the washer button the contacts close, the wiring to the BCM is sound but the outlet to the pump is not triggered -is this an internal BCM fault?

The only other thing that could be done is to wire the switch, through a fused relay to the pump, bypassing the BCM entirely?

I can't make any further suggestions but my post will keep this on the current list in the hope someone else will see it and offer one!

1 hour ago, Shearers said:

only other thing that could be done is to wire the switch, through a fused relay to the pump, bypassing the BCM entirely?

That would require two relays and a bit of fancy wiring.

The pump has to run in two directions.

4 minutes ago, unofix said:

The pump has to run in two directions.

Does @MrBruut's "MOT" require front and rear washers if the alternative is none or a BCM or other expensive fix - obviously up to him to decide on a quick and dirty fix or persevere with an "elegant" comprehensive solution?

@unofix, @Shearers

What is the best way to bypass the BCM? I contacted a mechanic earlier and he suggested taking the control signal from the BCM/pump line for the bypass. It turns out that when the washer button was pressed, the signal went to the BCM and then to the relay, and then to the pump. This relay was connected to the ignition line. After 10 minutes of testing with this bypass, the power relay in the fuse box at the passenger's feet began to heat up a lot. The ignition line began to overheat due to the pump. I had to abandon this option. What is the best way to bypass this? Connect it to line 30 with a constant +?

If you wait till Friday, I'll see what I can work out. The pump control is more complex than you would expect.

Thank you very much. I will wait. And I also wanted to ask about checking the bcm/pump line. How can this line be checked with a lamp? Maybe install it instead of the pump and see how the lamp reacts to the washer button?

You can disconnect both wires from the pump motor and connect a 21 Watt lamp to the wires. It should light if the screen wash is activated for either the front or the rear.

@unofix

Do you need any information about the car? VIN number or a photo of the fuse box?

17 minutes ago, MrBruut said:

or a photo of the fuse box?

Yes that would be of help 😀 and VIN please.

Ford Fiesta 1.6 Ti VCT USA 2012

I'll send you the VIN in a private message

 

 

8 hours ago, MrBruut said:

Ford Fiesta 1.6 Ti VCT USA 2012

We have a problem !!! 🙁

Your car is a LHD model built to the USA specification. The wiring and fuse box is different to the UK and European models. All of my schematics for the 2012 Fiesta are only for the UK/European model.

The fuse box in your photo is completely different to the version shown in my schematics. Just for your information I'll attach a copy.

I will need to see what information I can find on your USA model.

FiestaMK72012_cel081.pdf

Here is the solution of how to by-pass the BCM for the front and rear screen wash.

The wire numbers and colours will be different for your USA car, but an Auto-Electrician should be able to work it out.

 

 

@unofix

Thank you very much for helping!🙏🤩

If the master can do the bypass as in the diagram, I will share the photo🫡

Hi, @unofix
I couldn't find a technician in my country who could do the bypass😅. I decided to do it myself. I wanted to ask you. After you press the washer button, the signal goes to the relay coil. An electromotive force is generated there. This force is returned to the Button-BCM line.
Could this damage the washer button or overload the line? And are there any ways to avoid this problem?

If you are really concerned about back EMF form the relay coil (personally I don't think it will be a problem) you can stop it by simply fitting a diode directly across each of the relay coils (in reverse direction).