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 inspects 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, passenger front door module (PDM), LH rear door module (LRDM), or RH rear door module (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 inspects 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.

For power up, each door module has a separate battery voltage circuit fed by the rear fuse block, and, one or more separate ground circuits connected to a ground stake. These voltage and ground circuits are in the C3 harness connector of each door module and are also used for power window switch and express up sensors, and for power outside rearview mirror and door lock operations. Door modules power and ground, as it applies to mirrors and locks, is discussed in the applicable mirrors and locks description and operations sections.

Door modules battery voltage is supplied as follows:

These voltage and ground circuits must not be confused with the power and ground circuits used exclusively to drive the power window motors, which are discussed in the following paragraph.

Each door module has a separate battery voltage supply circuit used exclusively for power window motor operation. However, these individual circuits are spliced into one circuit, which is fed by the DR MOD PWR C/B circuit breaker located in the rear fuse block. Each door module also has a separate ground circuit, connected to a ground stake, and used exclusively for power window motor operation. 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. These power and ground supply circuits are in the C1 harness connector of each door module.

Each passenger door has a power window switch mounted to it. The passenger door modules, PDM, LRDM, and RRDM, each supply battery voltage and ground to their associated power window switch. There are 3 circuits for 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 to ground, and voltage flows through the switch, providing the associated door module with the necessary signal.

The driver door switch assembly (DDSA) receives power and ground, through separate circuits, from the driver door module (DDM). The DDSA contains the only power window switch for the driver door window, however, it also contains a window switch for each of the vehicles passenger doors. These switches differ from the individual power window switches mounted locally to each passenger door in that, the DDSA powers them internally. When a power window switch on the DDSA is operated, the normally open switch contacts for that function are closed, and battery voltage flows through the switch. 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 window to be fully opened by momentarily pressing the window switch to the second detente of the Down position. Any passenger door window can be expressed down from, either the appropriate window switch built into the DDSA , or from the window switch mounted to the associated passenger door. When either switch is operated to Express Down, both the Down contacts and the Express contacts of the switch being used are closed to ground and the 2 contact signal is interpreted as an Express Down request. If the window is operated from a passenger door window switch, the door module associated with the switch interprets the 2 contact signal. If the window is operated from the driver door, it is the DDSA that interprets the 2 contact switch signal.

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 .

The rear window lockout switch is built into, and receives power and ground from, the driver door switch assembly (DDSA). There are no external circuits. The lockout function is used to prevent the passenger door windows from being operated from their locally mounted switches. When the lockout switch is pressed momentarily, the switch contacts are briefly closed, the LED indicator on the switch button is illuminated, and the DDSA processes this switch signal. The DDSA sends the switch status, via class 2 serial data message, to the passenger door modules. The passenger door modules then prohibit the windows from being operated from the locally mounted passenger door window switches. When the lockout function has been activated, the passenger door windows can still be operated from the driver door by using the window switches built into the DDSA.