Sunroof / Moonroof: Description and Operation

Sunroof


The sunroof is available as an option and consists of a twin glass front and back panel. The front panel slides over the rear panel and tilts. The rear panel is fixed. The sunroof cassette is removable/replaceable and bolts to the roof.


Purpose of the System
The purpose of the Sunroof system is to provide opening and closing of the sunroof panel. The Slide/Tilt sunroof system consists of the following components:

- Sunroof Switch.
- Sunroof Motor with integrated Control Unit.

Sunroof Switch Positions


Open tilt - Manual/Automatic.
Open slide - Manual/Automatic.
Close tilt - Manual.
Close slide - Manual/Automatic.


System Components

Sunroof Switch
The sunroof switch is mounted in the roof headliner at the front of the car. The switch has double contacts: the first contact operates the roof all the time the switch is pressed; the second contact is for the one-touch functions of the roof.

Sunroof Motor With Control Unit





The drive for the sunroof is provided by a motor which is controlled by the integrated control unit. This assembly is mounted in front of the roof area between the roof liner and the lower section of the sunroof frame.

The control unit has a 13-pin connector that provides the connection between the wiring harness, the switch and the K-bus.

Two sensors (Hall sensors) are integrated in the motor/control unit for position recognition. When the motor is running, the control unit continuously monitors the sensors.

Principle of Operation

Tilt
Pushing in the center of the sunroof switch causes the rear of the sunroof to tilt open. To close the sunroof press the switch in the close direction.

Conventional Operation
Pressing and holding the sunroof switch in the open/close position will cause the sunroof to operate in either direction and operation will continue until the switch is released or the sunroof has reached its travel limit.

One-Touch Operation
Pressing and quickly releasing the switch in the open/close direction will cause the sunroof to either open/close to its travel limit, except in the close direction where the sunroof will stop in the tilt position and manual operation of the switch is required to complete closing.

Convenience Open/Close
Turning the key in the drivers to lock to the lock/unlock position and holding will cause the sunroof to open/close. The operation will continue as long as the key is held in position. Convenience opening is also available through the Interior Central Lock Switch. Pressing and holding the switch in the unlock position will cause the sunroof to open. Opening will occur as long as the switch is pressed.

Sunroof Switch
The switch sends a ground signal to the sunroof control unit. The circuit is closed when the control unit is connected to the ground/earth.

A current of approx. 12 mA then flows to enable the switch to function.

Sunroof Motor With Control Module
The motor with integrated control module has diagnostic capabilities and connects to the K-bus. Two Hall sensors are used to detect the position of the roof and provide the anti-trap function. The protected area is from 200 mm open to 4 mm, if an obstruction is detected within this range the roof will reverse direction for approximately one second.

Initialization
After carrying out any repairs to the sunroof the module must be initialized, this is achieved by pressing and holding the switch in the tilt position for approximately 15 seconds. The roof moving from the raised position to the close position confirms the initialization procedure.