Description And Operation: Operation
The dual pane power sunroof sliding glass panel and power sunshade motors both receive battery feed through a fused B(+) circuit from the Power Distribution Center (PDC). However, the on-board electronic module of each sunroof or sunshade motor monitors an input on a fused ignition (run - accessory) circuit and is configured to allow the power sunroof and the power sunshade to be operated only when the ignition is set to the ON/Run or ACCESSORY state or when the Accessory Delay System is active. The Accessory Delay System enables accessory operation with the ignition off only if neither front door has been opened.
The sunroof receives the following hard-wired commands from the overhead console switches:
- Sunroof Open
- Sunroof Close
- Sunroof Vent
- Sunroof Switch Return
- Sunshade Open
- Sunshade Close
The electronic overhead console communicates on the LIN Bus. The sunroof unit itself is not part of any communications network.
The sunroof has two modes of operation; manual and express. Manual mode is active when the sunroof switch is pressed and held for a time >0.8 seconds. When in manual mode the sunroof or sunshade operation will stop whenever the switch released. Express mode operation is a convenience feature that will automatically open or close the sunroof when the switch is pressed & released in a time <0.8 seconds. Pressing any of the sunroof switches while express mode is active will immediately stop sunroof operation. The sunroof also provides an obstacle detection feature which automatically reverses the sunroof when it encounters an obstacle within the roof opening during express close operation.
Switches mounted in the overhead console controls sunroof operation. The sunroof switch is a rocker design with a push button in the center of the two halves of the rocker. Pressing the rocker towards the front of the car commands the sunroof closed. Pressing the rocker towards the rear of the car commands the sunroof open. Pressing the center push button commands the front sunroof glass panel up into the vent position. If sunroof glass and sunshade are closed and one of the sunroof open/vent push buttons are pressed, the system will automatically retract the sunshade to behind the front glass opening (mid-point) before opening or venting the sunroof glass pane. Therefore, the sunshade can never cover the movable glass pane opening unless the pane is in the fully closed position.
The chart describes the normal sunroof response to glass control switch inputs (for both Express and Manual operation) when the glass is in various positions.
| Initial Glass Position → | Glass Closed | Glass Slide Open | Glass Vent | ||
|---|---|---|---|---|---|
| Glass Switch Actuation | OPEN | Sunshade opens to mid position (if closed) then glass slides open to comfort stop position | No movement | Glass first cycles closed and continues to slide open position | Sunroof Response |
| VENT | Sunshade opens to mid position (if closed) then glass cycles to vent position | Glass first slides closed and continues to vent position | No movement | ||
| CLOSE | No movement | Glass slides to closed position | Glass cycles to the closed position |
A rocker switch module mounted in the overhead console controls the power sunshade operation. Pressing the rocker towards the front of the car commands the sunshade closed. Pressing the rocker towards the rear of the car commands the sunshade open. When opening the sunshade it will automatically stop at mid-position, the sunshade open switch must be pressed again to continue to full open position. When attempting to close the sunshade and the glass is in the vented or open position the sunshade will stop at the mid-position. Pressing the sunshade close switch again will automatically close the glass; once the glass has fully closed the sunshade will automatically cycle to the closed position.
| Initial Shade Position → | Shade Closed | Shade Half Open | Shade Full Open | ||
|---|---|---|---|---|---|
| Shade Switch Actuation | OPEN | Sunshade cycles to half open position | Sunshade cycles to full open position | No movement | Sunroof Response |
| CLOSE | No movement | Glass first cycles to closed position (if glass open or vented) then sunshade cycles to closed position | - Sunshade cycles to half open position (if glass open or vented) - Sunshade cycles to full closed position (if glass closed) |
The integrated sunroof motor electronics are programmed to operate only one motor at a time (sunshade and glass cannot simultaneously operate). The two motors communicate switch input information as well as sunroof and sunshade position information with each other through a serial bus circuit, but do not communicate with any other electronic modules in the vehicle. The integrated motor electronics are programmed to automatically move the sunshade from the closed to mid-open before allowing the sliding glass panel to open or vent. Likewise, if the sunshade switch is pressed to close the sunshade while the sliding glass panel is in an open position, the integrated motor electronics are programmed to automatically close the glass panel before closing the sunshade.
The integrated sunroof motor electronics provide an obstacle detection feature for both the sliding glass panel and the sunshade that is active during express close operation. The motor electronics monitor motor closing load through motor speed. When an obstacle is detected due to a significant decrease in motor speed, the electronics will stop the motor closing motion and automatically reverse the motor direction to allow the obstacle to be removed. for options to override the obstacle detection system. Refer to MOTOR, SUNROOF, STANDARD PROCEDURE .
The integrated sunroof motor electronics provide a thermal protection feature to protect the motors from overheating. If the sunroof is cycled repeatedly open/close enough to cause motor overheating the software will allow one final closing cycle before it stops responding to further switch inputs. Once a motor has cooled sufficiently, normal operation will be automatically restored. However, the ignition switch must remain in the ON or ACCESSORY positions so that the module remains awake long enough to monitor the cool down of the motor.
The integrated sunroof motor electronics monitors glass panel and power sunshade positions by counting motor rotations through integrated hall effect sensor output. If a motor is removed and re-installed or a new service motor is installed the Initialization procedures must be followed to reset and calibrate the electronics with the sunroof glass and sunshade positions. Refer to MOTOR, SUNROOF, STANDARD PROCEDURE .