The power windows system consists of the following components:

The vehicle is equipped with power windows controlled by the door modules. The driver door window is controlled by the driver door module (DDM), which is located in the driver door, while the front passenger door window is controlled by the passenger door module (PDM), which is located in the front passenger door. The rear door windows are both controlled by a single, shared rear door module (RDM), which is located beneath the rear seat cushion. The DDM receives a window switch request, via the power door serial data circuit, from, either the door module wired to the passenger door window switch pressed, or from the driver door switch assembly (DDSA). The DDM first examines information from the Class 2 serial data circuit to determine if conditions are correct, i.e. ignition switch position, for window operation to be permitted. If conditions are correct, the DDM either, moves the driver door window, or, sends the request to the appropriate passenger door module to move the associated window as requested.

The driver door window can be operated only from the driver window switch built into the DDSA while the passenger door windows can be operated from, either the appropriate window switch built into the DDSA, or, from the window switch mounted to the associated passenger door.

The power windows may be operated whenever the vehicle is in the Retained Accessory Power (RAP) mode, or, whenever the ignition switch is turned to the Accessory or Run positions.

In order to control power window operations, as well as other door functions, door modules must be powered up. Battery voltage is supplied from the fuse blocks, through separate circuits, to each door module. Each front door module is separately grounded through a ground stake. The rear door module has two separate ground circuits spliced into one, and grounded through a ground stake. The door modules also use these voltage and ground supplies to provide power and ground to their associated window and lock switches, however, the driver door lock switch is grounded directly through a ground stake. In addition, the front door modules use these voltage and ground supplies for outside rearview mirror operations. These circuits are in the C1 harness connector of each door module.

The DDM battery voltage circuit is fed by the DDM 10 amp fuse in the Rear Fuse Block.

The PDM battery voltage circuit is fed by the PDM 10 amp fuse in the IP Fuse Block.

The RDM battery voltage circuit is fed by the RRINMDL 10 amp fuse in the Rear Fuse Block.

Each front door module also has a separate battery voltage supply circuit used exclusively for power window motor operation. The rear door module has two separate battery voltage supply circuits spliced into one, and used exclusively for window motor operation. Although these circuits are separate at each door module, they are all fed by the same 30 amp PWR WDO circuit breaker located in the underhood-right fuse block.

Each front door module also has a separate ground circuit used exclusively for power window motor operation. The rear door module has two separate ground circuits, spliced into one, and used exclusively for 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 supply circuits to the appropriate window motor control circuits. The voltage and ground supply circuits designated for window motor operation are in the C2 harness connector of each door module.

The driver door switch assembly (DDSA) is a multiplexed switch device that communicates with the driver door module (DDM) via the power door serial data line.The DDSA receives battery voltage and ground from the DDM. There are no other external circuits concerned with power window operation from the DDSA. The DDSA has a window switch for each of the vehicles doors built into it, as well as switches to control the outside rearview mirrors and other door functions. The DDSA internally supplies the voltage and ground to each set of window switch contacts. When one of the power window switches is operated, the contacts for that switch are closed to ground, the DDSA interprets the switch activity, and reports it to the DDM. The DDM then applies power and ground to its associated power window motor, or, if the switch being operated is associated with one of the passenger doors, sends a message over the power door serial data line to the appropriate passenger door module to operate its associated window motor.

Each passenger door has a window switch mounted to it. Each passenger door module supplies battery voltage to the two signal circuits of its associated window switch. One signal circuit is for an Up signal and the other is for a Down signal. Each door module also supplies a ground circuit to its associated window switch. When the window switch is operated, the normally open contacts for that function, up or down, are closed to ground, battery voltage flows through the circuits and the switch, providing the associated door module with the neccessary signal. The door module checks to see if conditions are correct for window operation to occur, and then applies battery voltage and ground to its respective window motor to open or close 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 battery 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 battery voltage to the window motor Up control circuit, and ground to the window motor Down control circuit. When a window Down movement is requested, the module reverses the polarity and applies battery voltage to the window motor Down control circuit, and ground to the window motor Up control circuit.

The driver door window has the express down feature. This allows the driver window to be fully opened by momentarily pulling the driver window switch lever to the second detente of the down position and then releasing. The DDSA interprets the switch activity and sends the information on to the driver door module via the power door serial data line.

The window lockout switch is built into the driver door switch assembly (DDSA). The lockout function can be personalized to either, prevent both rear windows from being operated from their locally mounted switches, or, to prevent all of the passenger windows from being operated from their locally mounted switches.

The DDSA internally supplies the voltage and ground to the contacts of the lockout switch. When the lockout switch button is momentarily pressed, the normally open contacts are closed to ground, the LED indicator on the button is illuminated, and the DDSA interprets the switch signal. The DDSA then sends a message, via the power door serial data line, to the driver door module (DDM) indicating that the switch is active. The DDM then sends a message, via the power door serial data line, to either, both rear door modules, or, to all of the passenger door modules to prohibit the windows from being operated from their respective switches. The passenger door windows can still be operated using the appropriate window switch built into the DDSA.