Power Top/Sunroof (Service Information): Operation
The single pane power sunroof motor receives battery feed through a fused B(+) circuit from the Power Distribution Center (PDC). However, the on-board electronic module of the 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
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 the sunroof open switch is pressed, the system will automatically drag the sunshade open with the moving glass. When in the glass is in the open position it is not possible to close the sunshade; attempting to manually force the sunshade to the closed position while the glass in a slide open position may result in damage to the sunroof system.
| Initial Glass Position ? | Glass Closed | Glass Slide Open | Glass Vented | ||
|---|---|---|---|---|---|
| Glass Switch Actuation | OPEN | Glass cycles to open position | No movement | Glass first cycles closed and continues to slide open position | Sunroof Response |
| VENT | 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 |
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.
The integrated sunroof motor electronics provide an obstacle detection feature 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 thermal protection will engage and the sunroof will stop 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 position 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 positions. Refer to MOTOR, SUNROOF, STANDARD PROCEDURE .