52 14... Removing and installing outer upper rail trim with electric anchor fitting tensioner (from 04/2004)

Driver's seat only: 

Lever trim (3) out of seat mechanism:

1. upwards,
2. slide towards rear and feed out of anchor fitting tensioner.
   Fig 1: Identifying Driver's Seat Positions

   Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Secure plug connection with felt strip against unlocking.

Lock on plug connection to anchor fitting tensioner can be unlocked when trim is fitted.