Lockout Switch Feature
WARNING: This page is about a different car, the 2003 Chevrolet Monte Carlo and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
On Impala models, the driver window switch has a lockout switch which disconnects the battery positive voltage to the front passenger, left rear (LR) and right rear (RR) window switches, disabling them.