Sun roof drive mechanism

Fig 1: Sun Roof Drive Mechanism

Courtesy of VOLVO CARS OF NORTH AMERICA.

1. Drain channel support
2. Carriage
3. Guide link
4. Main arm
5. Front arm
6. Return rod
7. Mounting rail
8. Connecting rod

The three main positions of the glass panel (tilted, closed and completely open) are depicted below. When completely open, the glass panel lies under the vehicle roof.

Tilted position 

Fig 2: Sun Roof Tilted Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

Closed 

Fig 3: Sun Roof Closed

Courtesy of VOLVO CARS OF NORTH AMERICA.

Completely open 

Fig 4: Sun Roof Open

Courtesy of VOLVO CARS OF NORTH AMERICA.

Comfort position 

The fourth position (known as the Comfort position) is regulated by the Sun Roof Module (SRM). This position is 80 mm in front of the completely open position. Wind noise is reduced in this position.

Fig 5: Sun Roof Comfort Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

When the mechanism slides from the open to the closed position, the it is locked by the notches in the guide rails. The front part of the mechanism stops moving while the rear part slides the rear of the glass panel to the normal closed or tilted position. These positions are electronically regulated. The mechanical stop in the fully tilted position is only used for calibration. The electronically regulated tilted position is slightly lower. The drain rail is part of the mechanism and moves along with it.