Each power window is connected to a permanent magnet motor. The motor raises or lowers the glass when the door module applies voltage to the motor. The direction the motor turns depends on the polarity of the supply voltage provided by the associated door module. All four doors have their own separate modules.

A serial digital communications link, called the simple bus interface, is used for communications between door modules and the driver's door power window switches. The use of serial digital communications allows the use of a single wire to convey switching information between the LH front power window switch and the driver's door module. The serial communication is also used to transmit switching information from the driver's door module to the other three door modules.

The door modules apply battery voltage of the correct polarity to the respective window motor when any local, or power door lock switch, UP switch is operated, driving the window up. Battery voltage is applied to the respective window motor in the opposite polarity when any local, or power window switch, DOWN switch is operated, driving the window down.

The LH front door module (LFDM) directly controls the driver's door window motor and the express down window feature. The LFDM sends window UP/DOWN messages received from the LH front power window switch to the passenger door module (RFDM) and the rear door modules (RRDM), (LRDM) over the simple bus interface (SBI) line. The LFDM also contains a class 2 data link which communicates with other vehicle system modules. The left front power door locks and power outside rear view mirror are also controlled through the LFDM.

The RH front door module (RFDM) controls the passenger's door window motor. The RFDM controls the passenger's door window directly from the right front power window switch or from instructions over the simple bus interface (SBI). The right front power door locks and power outside rear view mirror are also controlled through this module.

The LH rear door module (LRDM) controls the left rear door window motor. The LRDM controls the rear window directly form the rear door window switch or from instructions over the simple bus interface (SBI).

The RH rear door module (RRDM) controls the right rear door window motor. The RRDM controls the rear window directly from the rear door window switch or from instructions over the simple bus interface (SIB).

The LH front power window switch provides switches for controlling all of the power windows. This switch also has a lockout button, which the driver can use to prevent the other window switches from functioning. The switch passes switching information to the LH front door module (LFDM) by way of the simple bus interface (SBI). Battery voltage and ground are applied to the power window switch from the drivers door module through circuits 640 and 351 respectively.

The simple bus interface is a serial data link. This serial data link replaces vehicle cables between various door modules with a single wire. The same amount of information is sent by multiplexing (time-sharing) data to and from each device over that wire. The serial data signals are referenced to ground. If the simple bus interface is lost, the RFDM, LRDM, and RRDM will enter the sleep mode. With the door modules in sleep mode, no power window operations are possible.

The express down window function is a driver's window only standard feature that allows the left front window to be fully opened by momentarily pressing the left front window DOWN switch to the second detent. Express down travel may be stopped at any position by momentarily pressing either the UP or DOWN switch.

When any driver's door power window switch is pressed, a simple bus interface (SBI) serial digital message is transmitted from the front power window switch to the LH front door module (LFDM) .

If either the passenger or the rear window switches are pressed, an SBI message, relating the switch operation, is transmitted from the driver's door module to either the passenger's door module (RFDM) or the rear door modules (LRDM), (RRDM) as appropriate. All of the window motors are directly controlled by their respective door modules.

If the driver's window switch is pressed, the LFDM will apply battery voltage of the correct polarity directly to the left front window motor, driving the window up or down.

Each window motor is protected by an electronic circuit breaker. If a window switch is held too long with the window obstructed or after the window is fully up or down, the circuit breaker opens the circuit. The circuit breakers have positive temperature coefficients (PTC) and reset automatically when voltage is removed from the motors.