Windows Express Up Feature

The driver door and the front passenger door have the Express Up feature. This allows the front door windows to be fully closed by momentarily pressing the window switch to the second detente of the Up position. However, because of safety concerns, the windows Express Up system is more complicated than the Express Down system. The Express Up system has been designed to detect when an object has become trapped between the window glass and the window frame, and to take the appropriate action when such an event occurs. The Express Up feature is controlled by the front door modules and the window motor sensors.

Each of the front door window motors has a window sensor mounted to it. The window sensors determine if there is an obstruction to the travel of its window glass by detecting differences in their respective window motors electrical pulses. If one of the sensors detects that a passenger, or other obstacle, has become trapped between the window glass and the window frame, it sends this information, via 2 communication circuits, to its associated door module. The door module then reverses the direction of window travel and disables the Express Up function.

Each front door module and corresponding sensor are wired to each other by 4 separate circuits. These are, the window sensor battery voltage circuit, the window sensor low reference circuit, the power window high speed serial data circuit, and the power window low speed serial data circuit. Each front door module supplies battery voltage, via the window sensor battery voltage circuit, and ground, via the window sensor low reference circuit, to the sensor. Each door module communicates with its sensor via the other 2 separate and unique communication circuits. The power window high speed serial data circuit is a one-way communications line from the sensor to the module. The power window low speed serial data circuit is a 2-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.

Either front door window can be expressed up from the appropriate window switch built into the DDSA. The front passenger door window can also be expressed up from the window switch mounted to the front passenger door. When either switch is operated to Express Up for either front door window, both the Up contacts and the Express contacts of the switch being used are closed to ground. When the front passenger door window switch is used, the front passenger door module interprets the 2 contact signal. When the window switch built into the DDSA is used, it is the DDSA that interprets the 2 contact switch signal.

If a front door module loses 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. This can be done by operating the switch of the affected window in the Express Up mode until it is in the full Up position. The switch must be held in the Express Up position for 3-5 seconds after the window has stopped moving. For more information about programming the Express Up function, refer to Window Motor Programming - Express Function .