Power Windows
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 (six doors with the V4U Option) have their own separate modules.
The drivers door power window switches are contained within the drivers door switch assembly module (DDSA). A serial digital communications link (Serial Data Class 2 line) is used for communications between the DDSA and the other modules on the vehicle. The individual door modules also communicate via the Serial Data Class 2 line. The use of serial digital communications makes it possible to send several messages over the same wire. For the power window system, it is used to convey switching information between the DDSA and the other door modules.
The door modules apply battery voltage of the correct polarity to the respective window motor when any local, or power window switch, is operated in the UP mode, 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 mode is operated, driving the window down.
Drivers Door Module (DDM)
The drivers door module (DDM) directly controls the driver's door window motor. The DDM also communicates with the other vehicle system modules.
Passenger Front Door Module (PFDM)
The passenger front door module (PFDM) controls the passenger's door window motor directly from the passenger front power window switch or from instructions over the Serial Data Class 2 line. The passenger front power door locks motor and the right side power mirror functions are also controlled through this module.
Left Rear Door Module (LRDM)
The left rear door module (LRDM) controls the left rear door window motor directly from the rear door window switch or from instructions over the Serial Data Class 2 line.
Right Rear Door Module (RRDM)
The right rear door module (RRDM) controls the right rear door window motor directly from the right rear window switch or from instructions over the Serial Data Class 2 line.
Left Middle Door Module (LMDM)
The Left Middle Door Module (LMDM) controls the left middle door window motor. Window operations can be controlled directly by using the left middle door switch, or directly by using the Drivers Left Middle Door Switch.
Right Middle Door Module (RMDM)
The Right Middle Door Module (RMDM) controls the right middle door window motor. Window operations can be controlled directly by using the right middle door switch, or directly by using the Drivers Right Middle Door Switch.
Drivers Door Power Window Control
The drivers door power window switches are built right in to the drivers door switch assembly module (DDSA).The DDSA provides control of all the power windows from the drivers position. The DDSA passes the switching information to the driver door module, and to the other door modules by way of the Serial Data Class 2 line. Battery voltage and ground are applied to each doors power window motor by each doors module through the associated motor control circuits respectively.
The DDSA also contains a rear window lockout switch, which the driver can use to prevent both rear door window switches from functioning. When the lockout feature has been activated, the lockout indicator LED will be illuminated.
Serial Data Class 2 line
The Serial Data Class 2 line is a serial data communications link. This serial data link replaces vehicle cables between the door modules and other modules on the vehicle 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.
Express Window Down Operation
The express down window function is available to all windows as a standard feature that allows the windows to be fully opened by momentarily pressing the appropriate 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.
Window Switch Operation
When a driver's door power window switch is pressed, a Serial Data Class 2 digital message is transmitted from the drivers door switch assembly (DDSA) to the driver door module (DDM).
When any other window switch is pressed using the DDSA, a Serial Data Class 2 message, relating the switch operation, is transmitted from the driver's door switch assembly (DDSA) to the appropriate door module; the (PFDM), (LRDM), (RRDM), (LMDM), or the (RMDM). All of the window motors are directly controlled by their associated door modules.
If the driver's window switch is pressed, the DDM 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.
