Power Windows Express Up Feature

The Driver Door Module (DDM) and the passenger front door module (PDM) have the Express Up feature. This allows the front door windows to be closed without holding the switch to the Up position for the entire window Up cycle. 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.

Each front door module and the corresponding sensor are wired to each other by four separate circuits in order to control the Express Up function. Each front door module supplies battery positive voltage (B+), 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 window sensor high speed communications circuit, which is a one-way communications line from the sensor to the module, and, the window sensor normal speed communications 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. These communication lines are used for state-of-health messages, window switch command status, and, to communicate the actual position of the window glass in relationship to the distance traveled by the window.

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.