Dual Pane Sunroof And Sunshade

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 when the ignition switch is in the ON or ACCESSORY positions or during the accessory delay feature. The Accessory Delay Feature enables accessory operation with the ignition off when either front door is open.

The electric motor operates the sliding glass panel or the sunshade through the use of mechanical drive cables, mechanical linkages and guides. For further mechanical information, refer to the Body service information for additional information on these components. Refer to DESCRIPTION .

The on-board electronic modules integral to the power sunroof and sunshade motors provide both express and manual opening and closing for their respective motors. The electronic modules store and recall a sliding glass panel or a power sunshade hard stop position, then counts the direction and number of motor rotations from that hard stop to enable the express open and close features. These hard stops must be learned by a service replacement motor and electronic module unit during an initialization procedure.

In addition, the electronic modules are programmed to move only one motor at a time. 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 electronic modules are programmed to move the sunshade out of the way into a safe mid-open position automatically before allowing the sliding glass panel to move. Likewise, if the sunshade switch is depressed to close the sunshade while the sliding glass panel is in an open position, the electronic modules are programmed to automatically close the glass panel before closing the sunshade.

The electronic modules also provide an obstacle detection feature (also known as Excess Force Limitation/EFL) for both the sliding glass panel and the sunshade. The modules each monitor motor closing load through motor speed. When an obstacle is detected due to a significant decrease in motor speed, the module will stop the motor closing motion while limiting the forces applied to the obstacle, then reverse the motor direction to allow the obstacle to be removed.

The electronic modules provide a thermal protection feature to protect the motors from overheating. If the motor is cycled enough to cause 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 power sunroof and sunshade circuits and switches may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the on-board electronic modules or the power sunroof and power sunshade motors. If there are no issues with the power sunroof and sunshade mechanisms and the power sunroof or power sunshade switches and circuitry test okay, but the motor and express or EFL features are still ineffective following the initialization procedure, the motor and electronic module unit must be replaced.