Windows: Description and Operation

Glass, Frames and Mechanisms

Windows Component Location









COMPONENT DESCRIPTION

Windshield

Windshield Components









The laminated windshield is bonded, and sealed, to the body aperture using PU sealant.
Both the optical unit for the rain sensor and the interior mirror-mounting boss are heat bonded to the inner surface of the windshield.
Vertical fine-wire multi-strand elements are fitted between the glass laminations to de-ice and demist the windshield. At the bottom of the screen six horizontal heating elements bonded to the interior glass surface prevent the wiper blades freezing to the screen during adverse weather conditions.
The windshield is supplied with the heating element flat foil connectors fitted to a moulded sealed terminal block. This terminal block is wired to a connector for connecting to the vehicle harness.

Rear Window

Rear Window Components









The rear window is made from green tinted, tempered glass and is bonded to the door frame using PU sealant. The heating element, connected by two lucar terminals, is fitted to the inner surface of the rear window.

Door Windows
The door windows are manufactured from green-tinted toughened glass. The driver and passenger windows are electrically operated, and are raised and lowered by a cable mechanism; the rear glass sections in the rear doors are fixed units.
All windows can be operated individually, or by the driver's window control switch. The operation of the windows is proportional to the switch activation. The driver window can be controlled by 'one touch' in an upward or downward direction. When the 'one touch' operation is activated in the upwards direction an anti-trap sensor is automatically checked prior to the window closing. If the anti-trap sensor is inoperative the window will not close. When the anti-trap sensor detects an obstacle in the window's path, the upward travel of the window will automatically cease. Downward travel of the window will begin and then stop when a preset time has elapsed.

Front Window Regulators









Cable operated window regulators powered by an electric motor are installed in each of the doors.
The front window regulator and motor is supplied as an assembly and is handed. Each assembly comprises a front and rear runner, a continuous cable and a motor.
The door glass is located in two carriers, which are located in tracks in the runners. The glass is retained in friction pads in each carrier and secured with clamp screws.
Each carrier is attached to the cable, which, in turn, is attached to a drum driven by the motor. When the motor is operated the drum pulls the cable in the required direction to raise or lower the glass.

Rear Window Regulators









Cable operated window regulators powered by an electric motor are installed in each of the doors.
The rear window regulator and motor is supplied as an assembly and is handed. Each assembly comprises a runner, a continuous cable and a motor.
The door glass is located in a carrier located in a track in the runner. The glass is retained in friction pads in the carrier and secured with a clamp screw.
The carrier is attached to the cable, which, in turn, is attached to a drum driven by the motor. When the motor is operated, the drum pulls the cable in the required direction to raise or lower the glass.

SYSTEM OPERATION

Door Windows
All windows can be operated individually, or by the driver's window control switch. The operation of the windows is proportional to the switch activation. The driver window can be controlled by 'one touch' in an upward or downward direction. When the 'one touch' operation is activated in the upwards direction an anti-trap sensor is automatically checked prior to the window closing. If the anti-trap sensor is active the window will not close. When the anti-trap sensor detects an obstacle in the window's path, the upward travel of the window will automatically cease. Downward travel of the window will begin and then stop when a preset time has elapsed.
Electric window operation is enabled while the ignition is in power mode 4 and 6. When the switches in the driver's door are used to operate the passenger windows, the driver's door module outputs a related message on the LIN (local interconnect network) bus and medium speed CAN (controller area network) bus. The passenger door module responds to the message by operating the appropriate window. When the child lock is engaged, the rear door modules ignore inputs from the rear window switches.
End of travel shut off
End of travel shut-off for the window motors is determined by monitoring the current draw of the motors. Each time it switches on a window motor, the door module measures the window motor current for a preset time. The maximum value measured within that time is stored as the switch-on current. When the window motor current next exceeds the switch-on current, the door module assumes the window has reached the end of its travel and switches off the power supply to the window motor even if a window switch is still being activated.
Anti-trap
The anti-trap function is enabled for window closing in both the inching and one-shot modes. If the anti-trap feature is activated while a window is closing, the window motor is reversed for a preset period.
A Hall sensor, located in the window regulator motor, monitors the speed of the motor and if the speed decreases below a set threshold, indicating an obstruction, the power feed to the motor is reversed so the window goes back down for preset time.
In an emergency the anti-trap function can be overridden by holding the window switch in the one-shot closed position.
After the battery has been disconnected it is necessary to initialize the door window motors to be able to operate the one-shot up function.

WINDOW CONTROL DIAGRAM

NOTE:
A = Hardwired; N = Medium speed CAN (controller area network); O = LIN (local interconnect network) bus.