Citroen C4 Picasso 1.6 - Windshield Washer Pump Not Working, Checked Fuses and Wiring

Windshield washer pump stopped working.
The fluid and hoses are not frozen, I dismantled the pump, drained the fluid from the reservoir and pump without any problems.
The pump works when power is applied.
I checked the fuse in the engine compartment F4 10A OK.
I checked all the fuses in the engine compartment and cabin - all ok.
I measured the voltage on the pump cube - none, it does not appear when spraying the windows.
I checked the resistance on the connector with mass - it is present on both pins.
Measuring the resistance between the connectors on the pump cube indicates a 0 ohm short
I undressed the cube, measured the bare wires - the same, then a short circuit.
The fuse does not blow during spraying, so I do not know if the resistance on the cube is correct.
I don't know if it's supposed to be like this, or somewhere along the way one of the relays is damaged.

I don't really know what to do next.

Does anyone have a wiring diagram?
Citroen C4 Picasso 1.6 HDI 2007

Indiana wrote:

I checked the resistance at the connector with a mass

How should this sentence be understood? What does ground resistance testing mean?

Indiana wrote:

Measuring the resistance between the connectors on the pump cube indicates a 0 ohm short

This is correct, in the BSM, both wires are connected to ground via two changeover relays. When spraying the front one of these relays switches and gives a plus. When you spray the rear, the second relay switches. In this way, the current circuit is always closed and the pump can rotate in both directions.

Indiana wrote:

Does anyone have a wiring diagram?

Power to the pump comes from pins 2 and 5 on the 28-pin brown block located on the BSM (PSF1). F3 20A fuse on this module (F4 is for the headlight washers).

First of all, I would like to thank you very much for answering my question.

kybernetes wrote:

How should this sentence be understood? What does ground resistance testing mean?

I didn't describe it precisely, now that I read it, I really don't know what it is.
Measurement of the resistance of individual pins of the pump plug in relation to the car body.
On both of them, the resistance is 0 ohm relative to the car body.

kybernetes wrote:

This is correct, in the BSM, both wires are connected to ground via two changeover relays.

OK, could you tell me where these relays are located?
I will start by checking them and measuring if there is voltage controlling the coils.

kybernetes wrote:

F3 20A fuse on this module (F4 is for the headlight washers).

I just started with these fuses F3 F4, functional.
For lack of further ideas, I checked all the fuses - all in working order.
I asked good uncle Google, but I didn't find out anything else. Hence my post.

The relays are soldered on the board in BSM and then the whole thing is flooded with hard rubber. Not to be moved. If the BSM has failed, it must be replaced. Of course, first it would be good to check if it is actually BSM, because it can also be the fault of, for example, the switch on the steering wheel. Take a good look at it, check the fuse sockets, replace the fuse, plug the bulb into the BSM pins, check whether turning on the washer gives any sound effect in the BSM, etc. - in a word, check carefully.

I think you're confusing BSM with ECU. BSM is not flooded with any rubber. But still, digging in it requires experience. Probably the easiest way to check it is with LEXIA, PROXIA or DIAG BOX whether it is the fault of the control (COM2000), or executive circuits in BSI, or finally the installation itself.

AUTOSTAN wrote:

I think you're confusing BSM with ECU. BSM is not flooded with any rubber.

It's filled with rubber.

Hello,
I'm getting on the topic.
My symptoms were as follows:
one day the washer turned on by itself and worked - the car had been parked for several hours, closed with the remote control. Turning the engine on and off and closing the central one did not change anything. Moving the lever did not help. Turning on the rear window washer turned off the front washer, and when the rear washer was turned off, the front washer worked. I disconnected the plug on the pump. After some time I connected the pump, but nothing worked.
I checked the fuses in the engine compartment - ok
I checked with Diagox - no error indicating a problem with the washer. Front / rear washer control test ok - so the switch on the steering wheel is ok and the computer too.
I replaced the BSM and no change - still does not work even though the wipers work properly.
And I'm out of ideas.
Maybe someone can help?
Thank you

Hello,
in Citroen C4 Picasso Grand (7 seater) there were symptoms as well as in the author's, i.e. inoperative windshield and rear screen washers, no reaction when switching the lever, but the wipers functioned normally. The problem was fuse no. 3 (in the attached diagram) in the BSM.
On the Internet, you can find many diagrams of fuse boxes, not always with the appropriate descriptions or markings for a given vehicle model or version. I attach below description of the fuse box for the module BSM number 9661708080 located in the engine compartment next to the battery.

Fuse - Amps - Description
1 - 20A - Motor management
2 - 15A - Horn
3 - 10A - Front and rear window washer pump
4 - 20A - Headlight washer pump or LED
5 - 15A - Engine components
6 - 10A - Steering angle sensor, DSC
7 - 10A - Brake switch, clutch switch
8 - 25A - Starter
9 - 10A - Headlight motor, park management unit
10 - 30A - Motor components
11 - 40A - Not used
12 - 30A - Wipers
13 - 40A - Built-in system interface
14 - 30A - Pump
15 - 10A - Right high beam
16 - 10A - Left high beam
17 - 15A - Right dipped beam
18 - 15A - Left low beam
Source: https://fuse-box.info/

It is also worth checking: the washer pump, hoses, nozzles and shifters.
In the case of shifters, someone may indicate damage to the contacts or cracking of the plates.
The shifters in the C4 Picasso / Picasso Grand (2006 - 2013) are not removable and an attempt to disassemble will result in damage to the fasteners (clasps). The spider arms of the combination switches can be replaced as well as the control plate, however, pay attention to the part number.

>>18129419
Any news with this? Same issue with 2007 C4. Fuse of screen washer pump ok and BSM changed to new. Pump works with external 12v when tested.