Windows Express Up Feature

Both the driver door and the front passenger door have the Express Up feature. This allows either front door window to be fully closed by momentarily pressing the appropriate window switch to the second detente of the Up position. Both the Up contacts and the Express contacts of the switch are closed. When the front passenger door window is operated from its locally mounted window switch, the front passenger door module interprets this two contact signal as an Express Up request. When either front door window is operated from the driver door, the DDSA interprets the two contact switch signal and sends it on, via the class 2 serial data circuit, to the appropriate front door module.

Each of the front door window motors has a window sensor mounted to it. The window sensors detect differences in their respective window motors electrical pulses to determine if there is an obstruction to the travel of its window glass. If one of the sensors detects that a passenger, or other obstacle, has become trapped between the window and window frame, it sends this information, via two communication circuits, to its associated door module. The door module then takes the appropriate action and, either disables the Express Up function, or reverses the direction of window travel.

In order to control the Express Up function, each front door module and the corresponding sensor are wired to each other by four separate circuits, which are described here. Each front door module supplies battery voltage, via the window sensor battery positive voltage circuit, and ground, via the window sensor low reference circuit, to the sensor. Each door module communicates with its sensor via the other two separate and unique communication circuits. The communication circuits are, the power window high speed serial data circuit, which is a one-way communications line from the sensor to the module, and, the power window low speed serial data circuit, which is a two-way communications line that carries information both ways, from the sensor to the module, and, from the module to the sensor. State-of-health messages, the position of the window glass in relationship to the distance traveled by the window, and the direction in which the window is moving are communicated via these circuits.

If a front door module looses power for any reason, such as a vehicle battery disconnect, the window sensor/motor assembly must be reprogrammed once power has been restored to the door module. Refer to Window Motor Programming - Express Function .