The Power Window System consists of the following components:

The driver power window is controlled by the driver window switch which also serves as the master switch for all windows. The passenger windows can be controlled by the power window switches located on the driver power window switch or from the power window switch mounted locally on its associated door.

The power windows can be controlled in the following modes:

When the driver power window switch is activated to a desired position, the DDM examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, the DDM will send a LIN serial data message to the driver door window motor to move the window to the desired position.

When the DDM receives a request to operate the a right window from the driver master control, a GMLAN serial data message is sent to the FPDM. The FPDM examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the FPDM will send a LIN serial data message to the appropriate right window motor to move the window as requested.

The DDM and FPDM supply their respective rear power window switches with a 12-volt reference and signal circuit. The rear power window switches contain separate resistors for each switch position. When a rear power window switch is activated, the associated door control module interprets the signal and checks for messages from other vehicle control modules prohibiting the window movement.

If no prohibitive messages have been received, the door control module sends a LIN serial data message to the appropriate power window motor commanding the requested window position.

The driver window will travel to the fully down position when the driver window switch is pressed past the first detent. Pressing the driver window switch to the up position will cancel the express down feature.

The window lockout switch is part of the driver master control. The lockout function is used to prevent the passenger door windows from being operated from their locally mounted switches. When the lockout switch is pressed momentarily, the switch contacts are briefly closed, the LED indicator on the switch button is illuminated, and the DDM processes the switch signal. The DDM sends the switch status via GMLAN serial data to the FPDM. Both the DDM and FPDM will prohibit the passenger windows from being operated from their locally mounted window switches. When the lockout function has been activated, the passenger door windows can still be operated from the driver master control