I've got a 1997 BMW 528i and the winshield pump won't pump. I checked the connector at the pump and I've got a continuous 9v, even with the ignition off. Is there a relay that could be shorted (all fuses are fine)? If so where is it located on this car? There are only 4 relays at the fuse block over the battery. I pulled all 4 of them and I've still got 9v at the pump connection.
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Check and verify that you indeed have the winshield washer tank filled if the tank is filled make sure the winshield washer hoses are attached to the washer nozzles under the hood if all of this checks out you probably have a bad windshield washer pump...
I expect that you have two different pumps. One for your headlights and one for the winshield. So making the following test, turn off your headlights and try to get washer in your windshield. If you hear the sound of a pump then the line is disconnected or clogged somewhere. If you don't hear anything then the pump is bad. Not hard to replace (should be attached to the reservoir), not very expensive I would say $60 in auto part store)
Hope it will help
CHECK TO SEE IF THE PUMP IS RUNNING. IF SO AND NO WATER, REMOVE THE LINE(S) COMING OUT FROM THE PUMP AND BLOW GENTLY THROUGH THEM TO UNPLUG THEM. SOMETIMES DIRT SETTLES IN THE BOTTOM OF THE WATER TANK AND PLUGS THE LINES SO NOW WATER CAN FLOW. GENTLY CAUSE A FLOW IN THE OPPOSITE DIRECTION TO DISLODGE THE DIRT IN THE MOTOR PUMP.
These days, most windshield washer pumps are mounted to the bottom of the washer fluid reservoir. Where’s that, you ask? Well, you know that spout you pour the fluid into—the one that disappears into nowhere? Well, the reservoir is actually located inside the front fender between the bumper and the front wheel.
To replace the pump, you will have to jack up the vehicle, remove the front wheel and then remove the inner fender liner.