Power Windows Operation

The vehicle is equipped with power windows controlled by the door modules. Each passenger door window can be operated, either from a power window switch built into the driver door switch assembly (DDSA), or from a power window switch mounted locally to the associated door. The driver door window can be operated only from the driver door power window switch built into the DDSA. When a window is operated from the DDSA, the DDSA interprets the window switch signal. When a window is operated from a passenger door window switch, the associated passenger door module interprets the window switch signal.

When any window is operated from the DDSA, the DDSA examines the switch input and sends the information to the driver door module (DDM) via the power door serial data circuit. The DDM checks to see if it has received any class 2 serial data messages from any of the other vehicle modules (i.e. ignition switch position) prohibiting the movement of the window. If the window being operated is the driver door window, and if no prohibitive class 2 messages have been received, the DDM then applies voltage and ground to the driver door window motor to move the window glass as requested.

If the window being operated is a passenger door window, and if no prohibitive class 2 messages have been received, the DDM sends the request, via the power door serial data circuit, to the appropriate passenger door module. The passenger door module then applies voltage and ground to the associated passenger door window motor to move the window glass as requested.

When a passenger door window is operated from the power window switch mounted locally to its associated door, the passenger door module examines the switch input and checks to see if the DDM has received any class 2 serial data messages prohibiting window operation. If there are no prohibitive messages, the passenger door module powers the associated passenger door window motor.

Both front door windows have the express down feature. This allows the front door windows to be fully opened by momentarily pulling the appropriate window switch lever to the second detente and then releasing.