Lockout Switch Feature
WARNING: This page is about a different car, the 2010 GMC Canyon and 2010 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
The window lockout switch, when closed, provides power to the passenger door switches enabling normal window operation and when the lockout switch is open, power is cut to the passenger door switches disabling window operation. Normal window operation is still available from the driver master control.