A heated vehicle sliding window assembly has a fixed glass panel with an opening formed in it and a slidably movable glass panel capable of closing the opening. Disposed on the fixed glass panel are electrically conductive grid lines that form two grid resistors which are connected together as a series circuit, which is connected between two electrically conductive bus bars deposited on the fixed glass panel. Disposed on the slidably movable glass panel are electrically conductive grid lines that form a third grid resistor, which is connected between two other electrically conductive bus bars disposed on the movable glass panel. Both sets of electrically conductive bus bars may be connected together as a parallel circuit when the opening is either opened or closed by the movable glass panel.