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

• 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.

• 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

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 Slide/Tilt 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: Direction Of Pressing Slide/Tilt Sunroof

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 Slide/Tilt Sunroof Switch

Courtesy of BMW OF NORTH AMERICA, INC.