BMW M3 2001 Manual page 61

Transporting children safely
To lock the belt
Extract the entire length of the belt from
the inertia reel mechanism. Allow the
reel to retract the belt somewhat and
engage the buckle, then tighten the belt
against the child restraint system. The
retraction mechanism is now locked.
The belt cannot be extracted further.
Always comply with the installation
instructions provided by the manufac-
turer of the child restraint system.
To release the belt
Release the safety belt, remove the
child's seat and retract the safety belt
to its end position on the belt retractor.
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