GF77.20-P-0003CA Electric Panoramic Sliding Sunroof, Function

GF77.20-P-0003CA Electric Panoramic Sliding Sunroof, Function
- with CODE (413) Panoramic glass roof with top sliding roof

Function requirements, general
^ No consumer shutoff by on-board electrical system management
^ C. 15R ON or run-on time active (except rain closing)
(up to t = 5 min. after c. 15R OFF, with front doors not yet closed)
^ C. 15R OFF or vehicle locked (rain closing only)

The electronic ignition lock control unit (N73) transmits circuit status c. 15 to the panoramic sliding roof control module (A98) via the interior CAN (CAN B)
The status of the left front door rotary tumbler switch (A85s1) is read in by the left front door control unit (N69/1) and provided via the interior CAN.

The status of the right front door rotary tumbler switch (A85/1s1) is read in by the right front door control unit (N69/2) and provided the interior CAN.

Electric panoramic sliding sunroof, general
The front section of the panoramic sliding sunroof can be opened in the tilt or slide position. The extended roller sun blind is retracted previously. Operation is accomplished with the panoramic sliding roof switch (N70/3s1) in the overhead control panel electronic system (N70/3).

It is possible to open or close the panoramic sliding roof together with the side windows from one control point. This convenience feature is described separately in the convenience feature (CF) function.

Thermal protection:
The panoramic sliding roof motor (A98m1) and panoramic sliding roof roller sun blind motor (M12/5m1) are protected against thermal overload by a software-based thermal protection in the panoramic sliding roof control module. This temperature in the motors is calculated in consideration of the voltage, current and duration of actuation as well as outside temperature.

The electric panoramic sliding window comprises the following partial functions:
^ Function sequence for opening/closing panoramic sliding sunroof
^ Function schematic for opening/closing roller sun blind
^ Function sequence for rain closing
^ Function sequence for anti-pinch protection
^ Function sequence for position monitoring and blockage detection
^ Normalization function sequence

Additional function requirements for opening/closing panoramic sliding sunroof
^ Roller sun blind OPEN
^ Panoramic sliding sunroof normalized
^ Valid reference data present for anti-pinch protection function of panoramic sliding sunroof

Function sequence for opening/closing panoramic sliding sunroof
First open closed roller sun blind completely before panoramic sliding roof is actuated.
The opening/closing panoramic sliding roof function comprises the following subfunctions:
^ Function sequence for manual opening/closing of panoramic sliding sunroof
^ Function sequence for automatically opening and closing panoramic sliding sunroof

Function sequence for manual opening/closing of panoramic sliding sunroof
Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. It actuates the integrated panoramic sliding roof motor according to the actuation. When the switch is actuated to the first catch point, the adjustment takes place for as long as the request is maintained. During closing, an anti-pinch protection function with escalation is active.

Function sequence for opening/closing panoramic sliding roof
Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. It actuates the panoramic sliding roof motor according to the actuation. When the panoramic sliding sunroof switch is actuated beyond the first catch point and then released, adjustment is performed to the limit stop.

The anti-pinch protection function is active during closing. The anti-pinch protection is activated to a limited extent during an opening procedure (anti-pinch protection for edge of rear glass roof). Automatic adjustment of the panoramic sliding roof is aborted if the panoramic sliding roof switch is actuated again.

Detection of switch signals
Actuation is detected once the panoramic sliding roof switch is actuated without interruption for t = 40 ±10 ms.

The maximum activation time is t ≥20 s. After t ≥60 s the system recognizes that the panoramic sliding roof switch is "stuck". The function can only be performed again using the panoramic sliding roof switch once the rest position is detected again.

additional function requirements for opening/closing of roller sun blinds
^ Panoramic sliding roof closed
^ Roller sun blind normalized
^ Valid reference data present for anti-pinch protection of roller sun blinds

Function schematic for opening/closing roller sun blind
The opening/closing roller sun blind function comprises the following subfunctions:
^ Function sequence for opening/closing roller sun blind manually
^ Function sequence for opening/closing roller sun blind automatically

Function sequence for opening/closing roller sun blind manually
Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. This actuates the roller sun blind motor in accordance with the actuation.

When the switch is actuated to the first catch point, the adjustment takes place for as long as the request is maintained. The anti-pinch protection function is active during closing.

Function sequence for opening/closing roller sun blind automatically
Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. This actuates the roller sun blind motor in accordance with the actuation. When the panoramic sliding sunroof switch is actuated beyond the first catch point and then released, adjustment is performed to the limit stop. The anti-pinch protection function is active during closing.

Additional function requirements for rain closing
^ Roller sun blind OPEN
^ Panoramic sliding sunroof normalized
^ Valid reference data for anti-pinch protection present
^ Panoramic sliding roof opened in sliding position

Function sequence for rain closing
Moistening the windshield is recognized by the rain/light sensor (B38/2). The front SAM control unit with fuse and relay module (N10/1) reads in the status of the rain/light sensor via the wiper/ inside mirror LIN (LIN 2) and transmits it to panoramic sliding roof control module via the interior CAN. It actuates the panoramic sliding roof motor. The panoramic sliding roof is adjusted to the tilt position. Monitoring is then no longer performed.
Moreover, rain closing is performed if the run-on time (t = 6 h) has expired or the voltage or temperature is no longer within the operating range of the rain/light sensor.

Alarm triggering by interior protection (with code (882) Interior monitoring (only with ATA [EDW]) is suppressed during rain closing to prevent undesired triggering of the anti-theft alarm system (ATA [EDW]).

Additional function requirements for anti-pinch protection
^ Panoramic sliding roof or roller sun blind normalized
^ Valid reference data for anti-pinch protection present

Function sequence for anti-pinch protection
Anti-pinch protection operates by comparing the current rotational speed of the panoramic sliding roof motor or roller sun blind motor with the power consumption recorded during a teach-in run or adaptation.
If this comparison exceeds a certain limit value during a closing operation, this is detected as a blockage by the panoramic sliding roof control module.

Teach-in mode: The panoramic sliding roof and the roller sun blinds are moved through all closing operations in the normalized state. The panoramic sliding roof control module adapts to changes in the rpm resulting from increased sluggishness (e.g. dirt in the mechanical system).

If blockage is detected during opening, the panoramic sliding roof as well as the roller sun blind are stopped only. During closing, the panoramic sliding roof and the roller sun blinds are stopped when pinching is recognized and then reversed (moved in opposite direction).

Special case, manual closing:
If the panoramic sliding roof switch is again actuated in the closing direction within t = 2 s after reversing, greater force is applied. The anti-pinch protection function is deactivated for the next closing procedure.

Additional function requirements for position monitoring and blockage detection
^ Activated actuation of panoramic sliding roof

Function sequence for position monitoring and blockage detection
Position monitoring is performed by the panoramic sliding roof control module by evaluation the signals from the following sensors:
- Hall sensor 1, panoramic sliding roof (A98b1)
- Hall sensor 2, panoramic sliding sunroof (A98b2)
- Hall sensor 1, panoramic sliding roof roller sun blind (M12/5b1)
- Hall sensor 2, panoramic sliding roof roller sun blind (M12/5b2)

The Hall sensors are positioned on the shafts of the panoramic sliding roof roller sun blind drive unit and panoramic sliding roof motor offset by 90°. The position of the panoramic sliding roof and the roller sun blinds are determined and monitored by counting the Hall sensor pulses.

The zero position is set by normalization. The zero position is the position at which the panoramic sliding sunroof and roller sun blinds are closed. Blockage is detected if signals are no longer detected from the Hall sensors for a period of t = 160 ms during an adjustment request. If blockage is detected in the closing direction, actuation of the of the roller sun blind motor and the panoramic sliding roof motor is interrupted and reversing is started. If blockage is detected in the opening direction, actuation of the roller sun blind motor and panoramic sliding sunroof motors is aborted.

Additional function requirements for normalization
^ Roller sun blinds or panoramic sliding roof denormalized
^ The roller sun blinds and panoramic sliding sunroof must be a minimum distance away from the normalization position before they are actuated to the normalization position.

Normalization function sequence
Manually close roller sun blinds and panoramic sliding sunroof with panoramic sliding roof switch until the mechanical stop is reached. Then press panoramic sliding roof switch again for min. t = 1 s so that the panoramic sliding roof control module recognizes a blockage and sets corresponding location counter to zero.

Denormalization is performed under the following conditions:
- With circuit 30 OFF while actuating roller sun blind motor or panoramic sliding roof motor
- If the panoramic sliding sunroof exceeds the defined movement range by 25 motor rotations
- If the defined Hall sensor signal sequence is faulty
- If the positions of the roller sun blind and panoramic sliding sunroof are implausible relative to each other

The position of the panoramic sliding sunroof and the roller sun blind cannot be determined in the denormalized state. The function is then limited to manual closing or opening. Actuation can only be performed in steps of t = 0,5 s each.