Sliding Sunroof Control Module, Basic Function - GF77.20-P-9891A

MODEL ALL (CAR) with CODE 414 (Sliding sunroof) 

Overview 

This document contains the following information:

• Location 
• Structure 
• Task 

Location 

The sliding sunroof control module is located on the front roof frame.

Structure 

The following elements are integrated in the sliding sunroof control module:

• Sliding roof control unit
• Hall sensors (position feedback and rpm acquisition)
• Sliding sunroof motor (drive of redirecting transmission)
• Redirecting transmission (conversion of the rotary movement into linear movement of the drive spindle)

Task 

The sliding sunroof control unit actuates the movements of the sliding sunroof via the sliding sunroof motor and reads in the following signals for this purpose:

• Hall sensor signals of the sliding sunroof motor
• Requirements for actuation
• Signals of the rain and light sensor
• Status of the front doors (open/closed)
• Vehicle speed
• Outside temperature

The sliding sunroof control unit is connected to the network architecture of the vehicle via the interior CAN (CAN B).

The sliding sunroof control unit transmits information on the current position and movement of the sliding sunroof via the interior CAN.

Overheating protection: 

The sliding sunroof control unit protects the sliding sunroof motor from overheating. The temperature of the sliding sunroof motor is calculated by considering the supply voltage, the flowing current, the duration of actuation, and the outside temperature. If the overheating protection was triggered, the actuation of the sliding sunroof motor is disabled for a minimum cooling time.

Exception: 

The overheating protection function does not operate during roof reversal (after a blockage is detected).