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      11-06-2007, 06:17 AM   #236
ronpal
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Drives: 335i & 940T
Join Date: Nov 2006
Location: Arlington, VA

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2 min wait for sensor

The official BMW installation instructions say it can take up to 2 minutes for the ultrasonic sensor to "recognize the interior parameters". BMW recommends testing the sensor by opening the windows, activate the alarm, wait 2 minutes then reach in threw the open window to test the sensor.
Good luck