Lockout Switch Feature
WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The driver window switch has a lockout switch which, when engaged, disconnects the power supply to the passenger window switches, preventing the passenger windows from operating from the individual window switches. Passenger windows can then only be operated from the driver window switch.