The window glass is correctly adjusted if it is parallel to the window cut-out from above and sinks evenly into the window seal. Since the coupe has frameless window glass, a proper door fit and perfect seals are a precondition for correct adjustment.
The glass can be adjusted without removing the door trim if only the following parameters are to be adjusted: immersion depth -B- (see picture), parallelism to the body, as well as clamping. If there is a second hole behind the door molding, the immersion depth -C- can also be adjusted.
The following tool is required: Torx socket set ¼" with cross joint and extension.
By means of external or internal door handles glass automatically falls on 4-6 mm. The power window control unit recognizes the closed position by resistance when the mechanical stop of the power window is reached.
Attention: After adjusting, make sure that in the event of a failure of the automation, the glass does not get stuck in the area -B- or -C- in the door seal. Otherwise, the glass may break when the door is opened. Therefore, the end stop must be checked as follows:
- Open the door and raise the glass as far as possible.
- Close the door latch with your hand. The control unit receives a signal "The door is closed" and the glass starts to move up about 5 mm to its final position.
- Disconnect the battery or disconnect the power window motor connector.
- Open the door lock, the latch opens and the door can be closed.
- Close the door carefully. At the same time, make sure that if the automation fails, the glass is not clamped in the area -B- or -C- in the door seal. Otherwise, correct the setting.
Adjustment without removing the door trim
Immersion depth correction -B- (Drawing W 48277): Lower the window and remove the plugs at the bottom of the door.
Adjust the stops in height by turning the adjusting screws.
Close the door and mark the immersion depth -B- with a felt-tip pen. Dimension B is measured at a distance of 90 and 400 mm from the middle column. Open the door and measure the immersion depth of the upper edge of the glass. It should be between 1.5 and 2.5 mm.
Immersion depth correction -C- (Drawing W 48277): Lower the window about 105 mm from the top edge of the door trim.
Remove the moldings, turn the adjusting bolt to the right, while it turns away.
Close the door and raise the glass.
Align the glass lengthwise and tighten the adjusting screw, see illustration.
Close the door and mark the immersion depth -C- on the glass with a felt-tip pen (Drawing W 48277). Open the door and measure the immersion depth in relation to the top edge of the glass. It should be between 10 and 1.5 mm.
Check the end stop with the power window motor off as described above.
Parallelism adjustment (glass tilt): Remove the molding and turn the adjustment bolt in the left hole to the right (let loose). The figure shows a view of the fastening from the inside of the door. The adjusting bolt is located approximately 35 mm to the left and 15 mm above the hole in the door.
Align the glass and tighten the bolt.
Check the end stop as described above.
Pressure adjustment: To ensure a seal, the glass must be closer inward than the rest of the door. To check, lift the window and close the door until it touches the seal -arrow-. In this position, dimension -D-, measured 20 cm above the door rebate, must be 8 mm.
If necessary, loosen the 2 bolts at the bottom of the door and adjust the pressure by moving the glass guide.
Attention: Too much pressure can damage the glass when closing the door.
Check the end stop as described above.
Adjustment with door trim removal
This adjustment includes preliminary adjustments and should be carried out after replacing the mechanical parts of the power window.
Remove door trim.
Preliminary pressure adjustment: Loosen rear roller guide bracket. Then tighten the glass guide rail bolts on the inside of the door until they are in the middle of the slots (Drawing W 48282).
Adjust the pressure as described in subsection "Adjustment without removing the door trim".
Pre-adjustment of immersion depth -C-: Screw in window rail from above in center position.
Close the doors and raise and lower the glass. If the glass rests on the upper seal, loosen the main stop bolt, press forward and tighten again.
Preliminary pressure adjustment on the front roller guide: Raise and lower the window several times. Tighten the corner on the roller guide so that it can still move.
After that, adjust the clamp, as described in subsection "Adjustment without removing the door trim".
Parallelism adjustment (glass tilt). Close the window and use a felt-tip pen to outline the glass along the contour of the seals.
Loosen the bar bolt and move the bar so that the glass is parallel to the window frame.
After that, once again check the immersion depths -B- and -C- in the seal, adjust if necessary, as described in subsection "Adjustment without removing the door trim".
Check the end stop with the power window motor off, as described at the beginning of the section.
Finally, check dimension -A- between glass and cover plate. It should be 4-5 mm. If not, remove and replace the trim.