Windows: Description and Operation

GLASS, FRAMES AND MECHANISMS

The glass, frames and mechanisms include the front door window motor(s), rear door window motor(s), window control switches, rear window glass, front door(s) window glass, rear door(s) window glass, rear quarter window(s) glass, front door window regulator(s), rear door window regulator(s) and the windshield glass.

One-Touch Down/Up Window
The one-touch down feature can be activated by pressing either front window control switch to the second DOWN position. This allows either front door window glass to move downward until it is fully lowered. Momentarily pressing the front window control switch while the window is moving downward will stop the front door window glass and restore proportional down operation. The one-touch up feature can be activated and operated in the same manner by pressing the window control switch to the second UP position.

Door Window Glass
The bottom of the door window glass is mounted on a slider bracket which is part of the door window regulator. Door window glass bracket spacers provide attachment points for the door window glass and prevent direct contact between the slider bracket and the door window glass.

Window Control Switch
The driver window control switch can be used to power any or all of the windows. A single window control switch is located on all passenger door armrests to activate that individual window only. The driver window control switch sends a voltage signal directly to the smart motors for operation of the front window motors in the commanded direction. The driver window control switch sends a voltage signal to the DDM. When rear window motor operation is desired, the DDM sends a message over the SCP network to the REM. The REM operates the rear window motors in the commanded direction.

Motor, Window

NOTE: The front window motors require initialization. Refer to Door Window Motor Initialization.

New front and rear window motors are installed separately. The front window motors are "smart" window motors, meaning they have the one-touch up/down features. The rear window motors have no one-touch up or down operation, only proportional up/down operation.

Front Electronic Module (FEM) and Rear Electronic Module (REM)
The FEM receives inputs and delivers outputs to a majority of the electronically controlled features which reside primarily in the front of the vehicle, including the RH power window. The REM receive inputs and delivers outputs to a majority of the electronically controlled features which reside primarily in the rear of the vehicle, including the rear power windows. The FEM and REM are configurable modules and must be correctly configured to the vehicle. The modules may also be configured to allow additional features or functions to be added to the vehicle. The FEM and REM do not have any optional window control configurations.

Driver Door Module (DDM)
The DDM receives inputs from the remote keyless entry transmitter and hardwired components such as the LH front window control switch and delivers outputs in the form of SCP network messages and hardwired component control, including control of the LF and RF power window and roof opening panel (if equipped) during the global open/close feature. The DDM is a configurable module and must be correctly configured to the vehicle. The DDM may also be configured to allow additional features or functions to be added to the vehicle. The only DDM window feature that can be optionally configured is the window global open and close feature.

Global Open/Close
The global open/close feature is controlled by the DDM. The global open feature involves the DDM either receiving a signal from the door lock cylinder being held in the UNLOCK position for two seconds or the DDM receives a signal from a remote transmitter (when the customer holds the UNLOCK button on the transmitter for two seconds to activate the feature) and sends a voltage signal to the LH front, RH front smart window motors and the smart roof opening panel motor (if equipped). The smart window motors and smart roof opening panel motor will carry out a global open (simultaneous opening of the front windows and roof opening panel). Pressing any button on the remote transmitter, or actuating the door lock cylinder to the UNLOCK or LOCK position will interrupt the global open function. The global close feature can only be accomplished with the key in the door lock cylinder. The key must hold the door lock cylinder to the LOCK position for two seconds, at which time the DDM will receive the door lock cylinder signal and send a global close signal to the smart window motor and the smart roof opening panel motors. The smart motors will then carry out a global close (simultaneous closing of the front windows and roof opening panel) function. The global close function can be terminated in the same manner as the global open function.

Module Inputs and Outputs
This system is unique in that many of the inputs that the FEM, REM and DDM receive are over the SCP communication network. These input messages come from other modules connected to the network. The FEM, REM and DDM interpret the inputs then command the correct output that was requested. The modules also receive inputs which come from components directly hardwired to the modules, such as the window control switches.

One type of output the modules provide is over the SCP communication network in the form of messages. These types of outputs are usually generated from a module monitoring a hardwired input and sending a status message to another module. These outputs are commonly required by other modules to carry out their functions. The second type of output is the control of a component directly hardwired to the module.

Passenger Window Power Supply
The REM controls the power supply to all three passenger window control switches. To protect the REM from a potential failure, the REM removes power from the common passenger window power supply when a short to ground is sensed in any passenger window control switch, associated circuitry or the power output circuit of the REM. Power is be restored to the power output circuit upon a cycling of the ignition switch. If the REM output circuit is shorted to ground, the REM immediately removes power from the common power supply circuit. If any passenger window control switches or their associated circuits are shorted to ground, the power will remain on the REM output circuit until the switch or circuit containing the short to ground is activated.

Passenger Window Lock-Out
The LH front window control switch incorporates a passenger window lock-out switch. Activating the passenger window lock-out switch sends a separate voltage signal to the DDM. The DDM then outputs a message to the REM. The REM removes power to the passenger window control switches. Passenger window operation is allowed from only the LH front window control switch, or until the passenger window lock-out switch is turned off.

Passenger Front Power Window
The passenger front power window is controlled by input signals from the LH front window control switch or the RH front window control switch. The REM powers the RH front window control switch, which sends a voltage signal (when activated by the passenger) to the RH front window smart motor. The window motor raises or lowers (proportionally or one-touch, depending on the command) the window according to the command signal from the RH front window control switch. The DDM powers the LH front window control switch so it may send a voltage signal (when activated by the driver) to the RH front window smart motor.

LH Rear and RH Rear Power Windows
The LH rear and RH rear power windows are controlled by the REM. Operating commands for the rear power windows are received from the LH front window control switch over the SCP network from the DDM, or directly from the LH rear or RH rear window control switches, which are hardwired to the REM.

Activating the LH rear or RH rear switch on the LH front window control switch causes the DDM to send a message to the REM over the SCP network. The REM will then control power and ground to the appropriate window motor to raise or lower the window.

Activating either the LH rear or RH rear window control switch sends a voltage signal to the REM. The REM controls power and ground to the appropriate window motor to raise or lower the window. A voltage signal will only be received if the window lockout is OFF and the REM is supplying voltage to the rear window control switch power circuit. The rear window motors are not smart motors and have only proportional mode operation with no one-touch operation.

Heated Rear Window
The heated rear window is controlled by the REM, PCM and the dual auto temp control (DATC) module. The heated rear window switch is incorporated into the DATC module. When the switch is pressed ON, the DATC module sends a message over the SCP network to the REM. The REM checks other messages for vehicle rpm from the PCM. If the rpm message is received, the REM grounds the heated rear window relay coil control circuit (which is hardwired to the REM). The ground signal closes the heated rear window relay which applies power to the heated rear window grid. Fault management of the heated rear window feature prevents the heated rear window from operating when an rpm or ignition switch invalid/missing data message is received. The heated rear window eliminates condensation on the rear window.

Diagnosis
The FEM, REM and DDM constantly monitor their systems and generate diagnostic trouble codes (DTC) if there is a concern. DTCs can be retrieved with the diagnostic tool or an equivalent tester through the SCP communication network.

This vehicle design makes it unique in that electronic functions are divided into zones. The DDM controls features near the driver front door. The FEM controls features in the front portion of the vehicle and the REM controls the features in the rear portion. These systems use the SCP communication network in order to transmit and receive messages. It is vital when diagnosing the vehicle electronic systems to understand where the input (command) originates, all input information messages necessary in order for a feature to operate correctly, which module(s) receive(s) the input (or command message), if the module which received the input (message) controls the output of the feature or does it output a message over the communication network to another module, and which module controls the output of the feature.

Delayed Accessory
The delayed accessory feature allows the power windows, radio and roof opening panel (if equipped) to function for up to ten minutes after the ignition is turned OFF or until any door is opened. The delayed accessory function is controlled by the DDM. When the ignition switch is turned from ON to OFF, the DDM begins the timing sequence. If a door is opened, the FEM or the REM (the FEM monitors the front door ajar switches and the REM monitors the rear door ajar switches) sends a signal to the DDM over the SCP network, and the DDM turns off the accessory delay function. If the ignition switch is turned to another position, the DDM will also cancel the delayed accessory function.

Heated Wiper Park
The heated wiper park grid (located within the lower painted area of the windshield) receives power from the heated wiper park relay located in the underhood auxiliary junction box (AJB). The heated wiper park relay coil is connected to a fused circuit from the underhood AJB. The heated wiper park relay is controlled by a switched ground from the dual automatic temperature control (DATC) module heated wiper park ON/OFF switch. The heated wiper park grid is automatically activated by the DATC module when ambient air temperature drops below 3°C (38°F) and will shut off automatically when ambient air temperature uses above 3°C (38°F), or if the vehicle voltage is low.