The following components are used to control the power windows:

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 on its associated door. The driver door window can be operated only from the driver door power window switch built into the DDSA.

When the driver door module (DDM) receives a driver door window switch request from the DDSA, the DDM examines the request and checks to see if it has received any messages from any of the other vehicle modules prohibiting the movement. If no prohibitive messages have been received, the DDM then applies power and ground to the driver door window motor to move the window as requested.

When a passenger door module, PDM, LRDM, or RRDM, receives a window switch request from, either the DDSA or the window switch mounted locally to its door, the passenger door module examines the request and checks to see if it has received any messages from any of the other vehicle modules prohibiting the movement. If no prohibitive messages have been received, the passenger door module then applies power and ground to its associated window motor to move the window as requested.

In order to control window operations, as well as other door functions, door modules must be powered up. Battery positive voltage is supplied by the rear fuse block, through separate circuits, to each door module. Each door module is separately grounded through a ground stake. Additionally, the door modules use these power and ground supplies to provide power and ground to their associated window switch, and to provide power and ground for door lock operations. The front door modules also use these power and ground supplies for the window express up sensors and for outside rearview mirror operation. These circuits are in the C3 harness connector of each door module.

Door modules battery positive voltage is supplied as follows:

Each door module has a separate battery voltage supply circuit, used exclusively for power window motor operation. Although these circuits are separate, they are all fed by the same PWR WDO 30 amp circuit breaker located in the rear fuse block. Each door module also has a separate ground circuit used exclusively for power window motor operation. Each ground circuit is connected to a ground stake. When a door module drives a power window motor, the door module internally connects these voltage and ground circuits to the appropriate window motor control circuits. The battery voltage and ground supply circuits designated for window motor operation are in the C1 harness connector of each door module.

Each passenger door has a separate power window switch mounted to it. In order to receive a signal from their associated switch, the passenger door modules, PDM, LRDM, and RRDM, each supply battery voltage and ground to their associated power window switch. There are three circuits for battery voltage between each passenger door power window switch and its associated door module, one for an Up signal, one for a Down signal, and one for an Express signal. The door modules each supply ground to their switch via a fourth circuit. When the switch is activated for an Up, Down, or Express function, the normally open switch contacts for that function are closed, and voltage flows through the switch, providing the associated door module with the necessary signal.

The driver door switch assembly (DDSA) contains the only power window switch for the driver door window, and, also contains a window switch for each of the vehicles passenger doors. These switches differ from the individual power window switches mounted locally on the passenger doors in that, there are no external circuits. When a power window switch is operated on the DDSA, the DDSA interprets the switch signal, and then sends the appropriate request message, via the class 2 serial data link, to the appropriate door module to operate the window.

Each door module applies battery voltage and ground, through the window motor control circuits, to its associated window motor. The window motors are reversible. The direction the window moves depends on which motor control circuit the voltage is applied to, and which motor control circuit the ground is applied to. To move the window in the Up direction, the module applies voltage to the window motor Up control circuit, and ground to the window motor Down control circuit. When a window movement in the opposite direction is needed, the module reverses the polarity and applies voltage and ground to the opposite circuits to move the window in the reverse direction. During a window Express operation, the door module applies the voltage and ground to the window motor until the window is either fully open or fully closed.

All of the windows have the Express Down feature. This allows the windows to be fully opened by momentarily pressing the appropriate window switch to the second detente of the Down position. Both the Down contacts and the Express contacts of the switch are closed. If a passenger door window is operated from its locally mounted window switch, the door module associated with the switch interprets this two contact signal as an Express Down request. If the 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 door module.

The driver door and the passenger front door have the Express Up feature. This allows the front door windows 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 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.

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 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 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. 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 .

The rear window lockout switch is built into the Driver Door Switch Assembly (DDSA). The lockout function is used to prevent both rear windows from being operated from their locally mounted switches When the lockout switch is pressed momentarily, the switch contacts are breifly closed, the LED indicator is illuminated, and the DDSA receives the switch signal. The DDSA sends the switch status, via class 2 serial data message, to the left rear door module (LRDM) and the right rear door module (RRDM). The LRDM and RRDM then prohibit the rear windows from being operated from the rear door window switches. When the lockout function has been activated, both rear door windows can still be operated from the driver door by using the window switches built into the DDSA.