The power window system consists of the following components:

The power window system will operate anytime the retained accessory power (RAP) system is active or when the ignition switch is in the ACCY or ON position.

The driver door module (DDM) contains 4 power window switches which are integral components. Closing any of the normally open, rocker type switches provides the DDM with a request for power window operation. The switches for the 2 front windows have 3 positions up, down, and express down, while the switches for the rear windows have only 2 positions, up and down. Each of these switches and their positions is a direct input into the DDM. Upon receiving a request for power window operation, the DDM, transmits a Class 2 message indicating the switch and it's changed position.

The passenger door module (PDM) contains a single power window switch that is an integral component. Closing of this normally open, rocker switch provides the PDM with a request for the front passenger power window operation. The switch for the front passenger window has 2 positions up and down. Each of these switch positions is a direct input to the PDM.

The 2 rear passenger doors have their own switches. Each of the switches contain a power window up and down relay. A switch activation alone can control the up and down functions of the rear windows. However the body control module (BCM), upon receiving a Class 2 message from the DDM, can control the set of relays which will activate the rear window motors.

A permanent magnet motor operates each of the power side windows. Each motor raises or lowers the glass when the motor receives voltage. The direction the motor turns depends on the polarity of the supply voltage. The power window switches control the polarity of the supply voltage. A built-in circuit breaker protects each motor. The circuit breaker opens when the switch is depressed for a extended period of time under the following conditions:

The circuit breaker will reset automatically as the circuit breaker cools.

The switch for the driver power window has 3 positions up, down, and express down and its position is a direct input into the driver door module (DDM). Upon receiving a request for power window operation (switch activation), the DDM supplies voltage to the power window motor left front up or down circuit and grounds the opposite and the power window motor runs to move the window up or down.

The switch for the front passenger power window has 2 positions up and down, and its position is a direct input into the passenger door module (PDM). Upon receiving a request for power window operation (switch activation), the PDM supplies voltage to the power window motor right front up or down circuit and grounds the opposite and the power window motor runs to drive the window up or down.

The front passenger power window can also be controlled from the power window master switch. The power window master switch for the front passenger power window has 3 positions up, down, and express down and its position is a direct input into the driver door module (DDM). Upon receiving a request for front passenger power window operation (switch activation), the DDM transmits a Class 2 message indicating the changed switch position. When the PDM receives this message, the PDM supplies voltage to the power window motor right front up or down circuit and grounds the opposite and the power window motor runs to move the window up or down.

The passenger power window switches incorporate window up and down relays. The supply side of all the window up and down relays receive voltage through the battery voltage supply circuit and the LT DOOR or RT DOOR circuit breakers respectively. The normally closed contacts of each relay is connected to ground. The load side of each of the relays are connected to either side of the power window motor through the power window up and down circuits. The relay coil feed circuits are connected to the body control module (BCM) through the power window lockout control circuit and the relay control circuits are connected to the power window switches and to the BCM.

If a rear power window switch is placed in the down position, the down relay would energize and allow battery voltage to the power window motor through the power window motor down circuit. Since the opposite side of the motor is connected to the normally closed contacts of the up relay to ground through the power window motor up circuit, the window moves down. If a rear power window switch is placed in the up position, the up relay would energize and allow battery voltage to the power window motor through the power window motor up circuit. Since the opposite side of the motor is connected to the normally closed contacts of the down relay to ground through the power window motor down circuit, the window moves up.

The rear passenger power windows can also be controlled from the power window master switch. The power window master switches for the rear passenger power windows have 2 positions up and down and its position is a direct input into the driver door module (DDM). Upon receiving a request for rear passenger power window operation (switch activation), the DDM transmits a Class 2 message indicating the changed switch position. When the BCM receives this message, the BCM can control the rear window up and down relays.

The express down function controls both the driver and front passenger power windows but only from the driver door power window master switch. When either the driver or front passenger window switch is momentarily depressed to the express down position, it is a direct input into the driver door module (DDM). If the request was for the driver power window, the DDM supplies voltage to the power window down circuit continuously until the power window reaches the bottom of its travel. At this point, the DDM senses an over current situation on the power window down circuit and interrupts the voltage supply. If the request was for the front passenger power window, the DDM transmits a Class 2 message indicating an express down function was requested. When the passenger door module (PDM) receives this message, the PDM supplies voltage to the power window down circuit continuously until the power window reaches the bottom of its travel. At this point, the PDM senses an over current situation on the power window down circuit and interrupts the voltage supply. The express down function is limited by the DDM to 2 express down functions per ignition cycle.

The global window switch is part of the memory heated seat switch assembly and is an input to the driver door module (DDM). When the switch is operated to the up or down direction the up or down switch signal circuit is closed to the battery positive reference voltage. In an active state the up or down switch signal circuit voltage is supplied to the DDM through one of the 806 ohm resistors within the switch assembly. The resistors in the switch assembly enables the DDM to recognize an invalid switch signal. During a global window down function the DDM operates the driver window express down and signals the passenger door module (PDM) and body control module (BCM) with a Class 2 message to operate all passenger windows express down. The SUT model midgate window is controlled by the midgate module. The DDM signals the midgate module to operate the midgate window through up and down 12-volt signal circuits. During a global window down function the DDM applies a momentary 12-volt down signal to the midgate module to activate the midgate window express down function. During a global window up function the DDM, PDM, and BCM will operate the driver and passenger windows up only while the up switch is active. The midgate window has an anti-pinch feature so when the midgate module sees the momentary 12-volt signal on the up circuit from the DDM the express up function will be performed.

The driver door module (DDM) contains a window lockout switch that is responsible for the disabling of all the passenger windows from the individual passenger window switches. When the window lockout switch is activated, the DDM transmits a Class 2 message indicating that a window lockout request has been received. When the passenger door module (PDM) receives this message, it will disable the power window motor up and down circuits. When the body control module (BCM) receives this message, it will interrupt the up and down relay coil feed voltage for both rear doors. Once activated, the lockout feature will remain in effect until the ignition switch is cycled or the DDM receives another power window lockout switch activation.