WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
Ultrasonic-welded connectors (1) can be identified by the welds (2) on their longitudinal side.
The contacts of these connectors cannot be replaced. Replace plug completely.