Same thing happened to me when I got my head unit and speakers installed. Sad part is that I had to reverse engineer what they did and unfuck the whole installation. The dealer ended up replacing both window sensors and motors on warranty as a result of the shop's "installation". Just check that the button isn't actually damaged or obstructed in some way. I learned that while correctly installing my sound system. And I actually paid those guys.............sad.
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 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
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