Belt buckle
WARNING: This page is about a different car, the 2006 BMW X5, 2005 BMW X5, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
The tongue on the belt strap must easily snap into place with an audible click.
When the "Press" button is pressed, the tongue must be ejected from the buckle under spring pressure.