61 35 900 Removing and installing/replacing ring antenna of electronic immobilizer: Notes
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 BMW 540i, 2002 BMW 540i, 2001 BMW 540i, 2000 BMW 540i, and 1999 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.
Unscrew screw.
Press upper section of steering column trim inwards on both sides in areas shown, detach lower section from below and allow it to hang down.