MSA function is deactivated by

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Deactivate MSA by means of button (1) in passenger compartment
Open seat belt buckle and driver's door

Fig 1: Identifying Passenger Compartment MSA Button
Courtesy of BMW OF NORTH AMERICA, INC.
Open engine bonnet/hood and ensure that engine hood/bonnet contact is not in workshop mode
- Workshop mode
  A = 10 mm
- Basic setting (engine hood/bonnet open)
  B = 7 mm
To make sure that the engine hood/bonnet contact is at the basic setting, if necessary press the hood/bonnet contact up to the limit position before starting work and slowly release.

Fig 2: Identifying Engine Bonnet/Hood Workshop Mode And Basic Setting Dimensions
Courtesy of BMW OF NORTH AMERICA, INC.