not really a big deal but its getting annoying! so, the passenger window works BUT i have to press the button multiple times for it to go all the way down or up. (it'll go either way little by little) not like the driver side, where i can just press it once and it goes down all the way by itself. why is it doing that?
Does it sound like the motor is straining to wind it up (light will dim if electric motor is heavily loaded with engine off). If not its most likely the switch has got some rubbish between the contacts. You may find a replacement at a dismantler fairly cheaply, or search the parts list at RealOEM.com Diagram Selection and then see how much it is at Pelican Parts or FCP Groton.
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bmw z3 passenger window 
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