Fastener Tightening Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Sunroof Deflector | 4 Nm | 35 lb in |
| Sunroof Housing Assembly | 9 Nm | 80 lb in |
| Sunroof Sunshade Motor/Wiring Harness Plug | 7 Nm | 62 lb in |
| Sunroof Window | 4 Nm | 35 lb in |
| Sunroof Window Front Bolts | 4 Nm | 35 lb in |
| Sunroof Window Rear Bolts | 4 Nm | 35 lb in |
| Sunshade at the Rails | 2, 5 Nm | 22 lb in |
The sunroof spoiler system consists of a moving glass panel and a 2nd fixed glass panel located just behind the moving glass panel. The moving glass component slides over the top of the fixed glass, and the roof panel. There is also a power roller sunshade which covers both glass panels. The electrical portion of the system controls the opening and closing of the sunroof glass and the power roller sunshade.
The electrical portion of the spoiler sunroof system consists of
- Body Control Module (BCM)
- Sunroof glass control module
- Sunshade control module
- Sunroof control switch assembly
- Sunshade control switch assembly
- Local interconnected network (LIN-Bus)
The sunroof electrical system uses a master/slave configuration utilizing a LIN-Bus based system for communication. The BCM is designated as the master, while the sunroof and sunshade control modules are configured as the slaves.
As the system master, the BCM uses the LIN-Bus communication bus to enable or disable sunroof and sunshade operation, communicate vehicle information to each controller, and request sunroof or sunshade movement. The sunroof/sunshade controllers provide system status and diagnostic information to the BCM for diagnostic reporting and operational purposes.
The sunroof glass and power sunshade are each controlled by its own integrated motor/controller containing the necessary electronics, motor, hall effect position sensors, as well as the interface to the driver control switches. Each motor/controller is capable of controlling motion based on control switch activation and LIN-Bus message commands from the system master.
There are times when the sunshade and sunroof operation are dependent on each other (see below). This dependency is controlled by the BCM because even though the sunroof controller and the sunshade controller reside on the same LIN-Bus they do not communicate directly with each other.
The integrated motor/controller used for glass control and for power sunshade control are actually the same physical part. All the operational software required to perform the glass and sunshade functions are contained in the one part. The function performed is determined by the grounding scheme of two function select input/output pins while the operational calibrations are loaded over the LIN-Bus communication bus by the sunroof system master, the BCM.
The sunroof and sunshade control switches are connected directly to their respective controllers and provide positions for open, express open, off, close, and express close. The control switch completes the circuit between two signals provided by the control module, a reference ground Input and a pull-up voltage provided by the analog to digital switch input. The control switch places a different resistor ladder network in the circuit depending on the function selected. The controllers analog to digital switch input reads the resulting voltage range and determines the function as indicated in the included charts.