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 to the 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 window is operated, the DDSA interprets the switch request and sends it to the DDM. The DDM examines the request and checks to see if it has received any class 2 serial data messages from any of the other vehicle modules prohibiting the movement. If no prohibitive messages have been received, the DDM applies battery voltage 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 applies battery voltage and ground to the associated window motor to move the window as requested.

Each power window motor receives battery voltage and ground from the corresponding door module via the window motor control circuits.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.

In order to control window operations, as well as other door functions, door modules must be powered up. Battery 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 voltage and ground to their associated window switch, and to provide voltage and ground for door lock operations. The front door modules also use these power and ground supplies to power the window express up sensors, and for outside rearview mirror operation.

Door modules battery voltage is supplied as follows:

These circuits are in the C3 harness connector of each door module and must not be confused with the battery voltage and ground circuits that are used exclusively to drive the power window motors. For more information concerning the window motor power and ground circuits, see the following paragraph titled Window Motors Power and Ground.

Each door module has a separate battery voltage supply circuit, used exclusively for power window motor operation. Although the circuits are separate, they are connected within the rear fuse block, where all are fed by the same PWR WDO 30 amp circuit breaker. 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. These battery voltage and ground 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 respective switch, each passenger door module, PDM, LRDM, and RRDM, supplies battery voltage and ground to the associated power window switch. There are three circuits for battery voltage between each passenger door power window switch and the corresponding 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 or Down 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. When the switch is activated for the Express Up or Express Down function, two sets of switch contacts are closed, first the Up or Down contacts, and then the Express contacts.

The driver door switch assembly (DDSA) contains the power window switch for the driver door window and a power window switch for each one of the passenger door windows. These switches differ from the individual power window switches mounted locally to the passenger doors in that, there are no external circuits. The DDSA is wired to the driver door module (DDM) for battery voltage, ground, and class 2 serial data. The DDSA supplies battery voltage to one side of the contacts of each of the integral window switches, and ground to the other side of the contacts. When a DDSA power window switch is operated, the contacts for that switch are closed to ground and the DDSA interprets the switch signal. The DDSA then sends the appropriate request message, via the class 2 serial data link, to the appropriate door module to operate the associated window.

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.

Both the driver door and the front passenger door have the Express Up feature. This allows either front door window 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 front 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.

In order to control the Express Up function, each front door module and the corresponding sensor are wired to each other by four separate circuits, which are described here. 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 power window high speed serial data circuit, which is a one-way communications line from the sensor to the module, and, the power window low speed serial data 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 lockout feature is used to prevent both rear windows from being operated from their locally mounted switches. The rear window lockout switch is built into, and receives battery voltage and ground from, the Driver Door Switch Assembly (DDSA). When the lockout switch is pressed momentarily, the lockout switch contacts are briefly closed, the LED indicator is illuminated, and the DDSA receives the switch signal. The DDSA interprets the switch signal and sends it on, 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 feature has been activated, both rear door windows can still be operated from the driver door by using the window switches built into the DDSA.