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      11-13-2012, 07:01 PM   #17
wdupdog
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Drives: Z4
Join Date: Feb 2011
Location: ND

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To help clarify the power window initialization process and why, this is copied from my 08 manual. FWIW, It may be that only roadsters are affected. When the door is opened on the roadster, the window goes down about 1/2 inch to clear the lip on the cloth top. Likewise on closure, the window then goes up 1/2 inch to seal. Further, on top down button push, the windows go down halfway then on cycle completion return to full up unless a button is pressed to interrupt(stop) the process.

Power Window Initialization

After a power supply interruption, for instance after disconnecting the battery, the pinch protection system must be reinitialized.

Roadster: when the convertible top has been stored in the convertible top com-partment for an extended period of time, e.g. in the winter months because the hardtop was being used, it may also be necessary to reinitialize the pinch protection system.<
Ensure that the doors and the Roadster's convertible top are closed before initializing.
1. Open the window completely.
2. Press the switch 4 times within approx. 10 seconds.
Afterward, perform the following procedure twice for each window:
1. Close the window completely by pulling the switch.
2. After the window is closed, keep pulling the switch for approx. 2 seconds.
3. Open the window completely by pressing the switch.
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