65 77 600 Replacing sensor mat for passenger seat occupancy detector
WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, and 2001 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
This operation is described in:
"Replacing seat cover for left or right front seat". Refer to 52 16 400 REPLACING SEAT COVER FOR LEFT OR RIGHT FRONT SEAT (SPORTS/ELECTRIC) .