MSA function is deactivated by:

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

Fig 1: Identifying Automatic Engine Start/Stop Button (MSA)
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
  1. = 10 mm
- Basic setting (engine hood/bonnet open)
  1. B = 7 mm
    
    Fig 2: Identifying Basic Setting For Engine Hood/Bonnet Basic
    Courtesy of BMW OF NORTH AMERICA, INC.

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.