54 0... Notes on steel and glass slide/tilt sunroofs (initialization/normalization/learning of characteristic curve)

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NOTE: Initialization comprises:

Normalization
Learning characteristic curve

The mechanical end positions are recorded and stored during normalization.

The characteristic curve is learnt immediately after normalization.

When the characteristic curve is learnt, the mechanical closing forces of the slide/tilt sunroof are recorded and stored for correct operation of the anti-trapping mechanism.

NOTE: Then carry out an initialization :

if the slide/tilt sunroof has been mechanically moved by means of the emergency actuator
in the event of malfunctions, e.g. no one-touch function, no opening or no comfort function possible
after disengagement of the drive unit
after work is carried out on the mechanism of the slide/tilt sunroof
after the control unit has been replaced

WARNING: There is no anti-trapping protection during initialization.

Normalization:

Press and hold the switch in the "Lift" direction
In the event of delayed starting or sudden stopping of the slide/tilt sunroof, continue pressing the switch in the "Lift" direction

Fig 1: Locating Sunroof Switch

Courtesy of BMW OF NORTH AMERICA, INC.

After reaching the lift end position (A), keep the switch pressed for approx. 15 seconds further
Normalization is completed when the slide/tilt sunroof in lift end position (A) presses again briefly in the direction of position (B).

Fig 2: Identifying Position (A And B)
Courtesy of BMW OF NORTH AMERICA, INC.

Learning characteristic curve:

The curve is learnt manually in the following steps:

After normalization, keep switch pressed in "Lift" direction.
The slide/tilt sunroof stops for 5 seconds in the final raise position after normalization. It then moves into the "Closed" position (learning of the "Closing from raising" curve)
The slide/tilt sunroof then moves into the "Open" end position and immediately back into the "Closed" position (learning of the "Closing" curve)
Release switch.

Fig 3: Locating Sunroof Switch
Courtesy of BMW OF NORTH AMERICA, INC.

NOTE:

The entire operation lasts approx. 75 secs.
Learning of the curve is terminated when the switch is released
If the switch is released in the meantime, the entire procedure must be repeated
On completion of successful initialization, the corresponding messages in the check control and the control display go out
Carry out function check (tip function, anti-trappin protection and, if necessary, comfort function)