Normal Operation
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The LH front window control switch provides power to the LH front window motor through circuit 991 (TN/LB) and ground through 992 (WH/BK) to operate the LH front window downward and power through circuit 992 (WH/BK) and ground through 991 (TN/LB) to operate the LH front window upward.