Swap the wires on the pumps and isolate whether it is the pumps themselves or not, by seeing if it works on the rear window then. The pumps are easy to replace, and are a common failure point. If you haven't found them yet, they are all next to each other in the bottom of the washer fluid reservoir.
Do a search on windshield washer pump, and you should find a thread with pictures to help further.
Or, go to www.realoem.com, and look at the parts book drawing for guidance.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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