3. Checking rubber seal

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 BMW 328xi, 2012 BMW 328i, 2011 BMW 328xi, 2011 BMW 328i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Check the bonded seals for correct positioning and perfect adhesion. The bonding can be checked by pressing back the sealing lip.
The force required to peel off the seal immediately after gluing must be greater than 10 N/cm.