51 24 004 Adjusting trunk lid lock (lower section of trunk lid lock)
WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.
Operation is described in:
Fit trunk lid in position, refer to 51 24 050 REMOVING AND INSTALLING/REPLACING LOCK (LOCKING CYLINDER) FOR TRUNK LID SET .