65 77 600 Replacing sensor mat for passenger seat occupancy detector
WARNING: This page is about a different car, the 2006 BMW 650i, 2005 BMW 645Ci, and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
US/CND front passenger seat (with OC3 mat) only: Seat cover must not be separated from padding. All parts must be replaced completely and released with the diagnosis system in event of defective fan, seat cover, seat heating, OC3 mat or padding.
This operation is described in:
"Replacing seat cover for left or right front seat", refer to 52 13 400 REPLACING SEAT COVER ON LEFT OR RIGHT FRONT SEAT (NORMAL/MANUAL) or 52 16 400 REPLACING SEAT COVER FOR LEFT OR RIGHT FRONT SEAT (SPORTS/ELECTRIC) .