Window Express Up and Down Operation

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The express feature allows the windows to be fully opened or closed by momentarily pressing the window switch to the second detent of the up or down position. Due to safety concerns with express up functionality, the system is designed to detect objects that become trapped between the window glass and window frame and reverse the direction of the window. This includes the use of window motor position sensors in each motor that determine the window position.

When a window switch is activated to an express up or down position, the door module associated with the power window switch will first receive the up or down signal and then the express signal is received. The door module will then send a signal over the GMLIN serial data circuit to the appropriate power window motor. This will tell the window motor module that an express function has been requested. The window motor module will then supply battery voltage and ground to the motor to drive the window to the full up or down position.