GF77.20-P-3001GZ Tilting/Sliding Roof Position Measurement, Function

GF77.20-P-3001GZ Tilting/sliding roof position measurement, function
- 164 with CODE (414) Power glass tilting/sliding roof up to Model Year 8

Position measurement
The position counter in the overhead control panel control unit (N70) is incremented or decremented with each edge of the Hall sensor 1, SR (M12b1) and Hall sensor 2, SR (M12b2). The zero position is defined as the tilting roof open position, i.e. when the tilting roof is fully open the position counter is at zero

The zero position is set by the normalization function. The position recognition is always active except in the sleep mode, regardless of:
- missing circuit 30
- switch and relay status

Direction recognition
Two 90 degrees offset Hall sensors, Hall sensor 1, SR and Hall sensor 2, SR are located on the shaft of the SR motor (M12m1). The Hall sensors output pulses for each rotation of the SR motor shaft. The overhead control panel control unit reads in these pulses.
Due to the time offset of the pulses the overhead control panel control unit recognizes the rotation direction of the SR motor.