Sunroof / Moonroof Position Sensor: Description and Operation

GF77.20-P-3004PP Sliding/Pop-Up Roof Obstruction Sensor, Function

- with CODE (414) Power glass tilting/sliding roof
- up to Model Year 8

Function up to 30.6.02
An excessive force limitation feature is provided in the sliding/pop-up roof for protection against injuries resulting from pinching body extremities. This feature is only active during "Automatic closing" and "Convenience closing" of the sliding/pop-up roof. A pressure-sensitive resistance foil is present on the front rubber edge of the sliding/pop-up roof for this purpose.
After pinching is recognized by the pinch protection foil or lock-up is recognized, the sliding/pop-up roof is reversed by the overhead control panel control module (N70); the sliding/pop-up roof is moved in the opposite direction.
If the sliding/pop-up roof is in the pop-up zone, it is moved to the pop-up stop.

The open sliding/pop-up roof is opened 125 mm if it is more than 125 mm from the rear stop at the time lock-up was recognized
If the sliding/pop-up roof is closer to the rear stop, it is opened completely.

In the event of a failure in the Hall sensor system it is ensured that the sliding/pop-up roof is reversed for t = 1 s when it is at least 150 mm away from the rear stop. After expiration of this time the sliding/ pop-up roof is desynchronized if the hall pulses are still absent. If the sliding/pop-up roof is close to the rear stop, it is switched off immediately, because the rear stop should not be subjected to mechanical loads.

If the excessive force limitation feature is defective, it is not possible to open/close the sliding/pop-up roof with the automatic feature.

Function as of 1.7.02
The pinch protection (M12b3) is monitored by Hall sensor 1 (M12b1) and Hall sensor 2 (M12b2).
If the pulses from the Hall sensors are not received in spite of actuation of the sliding/pop-up roof, the drive is switched off after t = 160 ms + 10 ms. In the pop-up mode the sliding/pop-up roof is also desynchronized. A mechanical thermal circuit breaker on the roof system motor (M12m1) will continue to provide overload protection. The sliding/pop-up roof can still be closed in increments of 160 ms or with the emergency crank in the event of failure of Hall sensor 1 (M12b1) or Hall sensor 2 (M12b2).

Reversing
After pinching is recognized by the pinch protection foil or lock-up is recognized, the sliding/pop-up roof is reversed; the sliding/pop-up roof is moved in the opposite direction.
The open sliding/pop-up roof is opened 50 mm if it is more than 50 mm from the rear stop at the time lock-up was recognized If the sliding/pop-up roof is closer to the rear stop, it is opened completely. In the event of a failure in the Hall sensor system it is ensured that the sliding/pop-up roof is reversed for t = 1 s when it is at least 150 mm away from the rear stop. After expiration of this time the sliding/ pop-up roof is desynchronized if the hall pulses are still absent.
If the sliding/pop-up roof is close to the rear stop, it is switched off immediately, because the rear stop should not be subjected to mechanical loads.