Windscreen Washer Not Working/Service CD - BMW Forum

Toxic · 10-13-2003, 12:19 PM

When I pull back the lever to operate the windscreen washer, absolutely nothing happens. No 'wheezing' sound from the pump to give me a glimmer of hope that it might be just a blockage. I've only gone as far as checking the fuse at the moment. I don't have any electrical schematics to work off, but I traced the hose to under the bonnet and found electrical connections at each of the jets. Presumed these jets electrical supply were fed from the same 12V supply as the pump so I disconnected one of them, pulled back the lever, but no 12V, so I am now suspecting the electrical, rather than a duff pump.

ghead

Anybody give me any guidance as to where to check next? If I had electrical schematics I would be able to give it a more detailed look, so if anybody knows where I could get/download these. I've heard of service CD's being available also.

Car is a 97 523i (E39).

SoonerE39 · 10-14-2003, 11:58 AM

I'll move this to the tech section where someone mght be able to give you a schematic

Toxic · 10-20-2003, 01:55 PM

Got to the pump today and removed the connector and checked the voltage across the connector with just ignition on and no activation at the lever. I got 9V which confused me. When I activated the lever, I got the 12V for the pump. I also took a direct 12V feed from the battery to the pump with no result.
I am now suspecting the pump but confused as to why I have the 9V when idle????

ghead

KC Ron Carter · 10-25-2003, 10:54 PM

Hmm,

On BMWs the washer motor is always powered.

The switch just supplies a ground.

Should be VI/BK power
BR/BK to the grounding switch.

Later,

Here is an e24 diagram, fuses and the intensive washer may be different.

http://members.roadfly.com/kcroncarter/etm129.htm

Toxic · 10-26-2003, 09:14 AM

Thanks for the cct diagram. E34 is the previous 5 series?

I actually think the relay contacts are fused closed, that is if there is a relay supplying voltage to the pump. Reason being, that even with the ignition off, I still have the 9V to the pump. Most cct drawings I looked at in the ETK CD, show that power to the washer pump is only when the key is in position ACCY, RUN or START.

If the switch provides a ground to give you the 12V potential across the pump, it still doesn't explain why I have 9V across the pump without pulling the lever.
Unless I am getting 3V on the ground side of the pump without pulling the lever from the control module electronics and that is normal.

ghead I'm guessing this 9V constantly across the pump though wouldn't take long to burn it out.

I've been in touch with my local BMW garage on the phone and they told me to call them back after the weekend and they should be able to help me more.

Wires on mine look like Black for + and Brown for -. There might be secondary stripes in the insulation, but didn't take too much notice.

Thinking of just getting a pump and seeing what happens when I connect it up.

What is the Intensive Washer Pump? Do they all have this feature?

Toxic · 10-27-2003, 04:58 AM

Quote:

Originally posted by KC Ron Carter@Oct 25 2003, 11:34 PM
Hmm,

On BMWs the washer motor is always powered.

The switch just supplies a ground.

Should be VI/BK power
BR/BK to the grounding switch.

Later,

Here is an e24 diagram, fuses and the intensive washer may be different.

http://members.roadfly.com/kcroncarter/etm129.htm

KC,

Just out of curiosity....where is the Wiper Control Unit normally located? On top RHS of drawing supplied it says see page 212 for Component Locations.