Rear Passenger Power Window Operation (RPO A31 W/O AN3, DL3)
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The rear passenger power windows can also be operated from the driver window switch. The left rear and right rear window switches on the driver master control has 2 positions, Up and Down, and its position is a direct input into the driver window switch. Upon receiving a request for rear passenger power window operation, the driver window switch transmits a command signal to the appropriate rear window switch which receives this message, the rear window switch then supplies voltage to the power window motor up or down circuit and grounds the down or up circuit and the power window motor runs to move the window up or down.