52 24... Emergency actuator for rear seat backrest

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, and 2009 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Release hook of backrest lock
Backrest

Fig 1: Releasing Hook Of Backrest Lock

Courtesy of BMW OF NORTH AMERICA, INC.

Insert screwdriver for levering in snap-in hole of rear seat lock.

Press screwdriver to center of vehicle and in so doing press supporting point (1) of Bowden cable outwards.

Fig 2: Pressing Supporting Point Of Bowden Cable Outwards

Courtesy of BMW OF NORTH AMERICA, INC.