Sun Roof Module (SRM)

Fig 1: Identifying Sun Roof Module (SRM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The Sun Roof Module (SRM) regulates the sun roof motor with the help of software. This software regulates pinch protection, calibration and drive mechanism movements.

• Pinch protection is a safety requirement to prevent anyone from getting injured when the sun roof is closed. Maximum closing force up to 50 km/h (30 mph) is 100 Nm. Over 50 km/h (30 mph), the closing force is adjusted based on vehicle speed to compensate for wind resistance.
• The sun roof is calibrated by opening the glass panel to its end position (completely open), which is then set as its zero position. The Sun Roof Module (SRM) must be calibrated for the panel to be able to find its main positions and for the pinch protection function to be active. The sun roof must be calibrated each time it has been disassembled. Calibration is performed following the information in appropriate diagnostics tool under Repairing/Cleaning, checking and adjusting.

The following are the main glass panel positions programmed in the Sun Roof Module (SRM):

Tilted Position 

Fig 2: Identifying Sun Roof Tilted Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

Closed 

Fig 3: Identifying Sun Roof Closed

Courtesy of VOLVO CARS OF NORTH AMERICA.

Open 

Fig 4: Identifying Sun Roof Open

Courtesy of VOLVO CARS OF NORTH AMERICA.

Comfort Position 

Fig 5: Identifying Sun Roof Comfort Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

The Sun Roof Module (SRM) determines the positions using a slotted gear wheel and two light sensors. These measure the number of gear wheel revolutions, which is proportionate to glass panel displacement.