Driver Power Window Operation
WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
The switch for the driver power window has 3 positions up, down, and express down and its position is a direct input into the driver door module (DDM). When the driver power window motor module receives LIN message from the DDM, the driver power window motor module will apply power and ground to the driver door window motor to move the window as requested.