Procedure after airbag deployment as result of an accident (M4 Coupe)

Replace all components that were affected by the accident and check all others! 

Check and/or replace following components after airbag deployment:

• Components
  • Safety battery terminal
  • Sensor B-pillar (left/right)
  • Sensor front door (left/right)
  • Sensor seat, Driver-/passenger's side
  • Airbag control unit, vehicle interior
  • Pedestrian protection sensor
  • Front sensor (engine compartment)

• Procedure
  • Inspect visually for mechanical damage (housing, plug connections). Replace damaged components
  • Connect diagnostic system
  • Read fault memory
  • Disconnect the vehicle battery and adhere to the waiting period (at least 30 seconds)
  • Inspect visually for mechanical damage
  • Rectify faults
  • Reconnect the vehicle battery and adhere to the waiting period (at least 10 seconds)
  • Delete fault memory
  • Switch off ignition and wait at least 2 minutes (no consumers may be switched on during this period such as interior light, radio, etc.)
  • Switch the ignition on (wait for at least 10 seconds)
  • Delete fault memory
  • If you cannot delete the fault memory: Replace the component that is causing the fault

Replace the airbag control unit in the following cases only: 

• In the case of visible external damage
• In the case of a corresponding fault memory entry (airbag check light is illuminated)

Cables and connectors 

• Components and procedure
  • Check cables and connectors for damage, replace if necessary. (e.g. corrosion, correct engagement, bent pin)

Seat belt system 

• Components
  • Electrically motorized reel
  • Seat belt tensioner
  • Seat belt height adjustment
  • end fitting pretensioner
  • seat belt buckle

• Procedure
  • Check components, replace if necessary
  • Additional door lock: Check for foreign object, remove it if necessary

Seats 

• Components
  • Seat
  • Airbag module
  • Active head restraint

• Procedure
  • Check seats (functional check of seat mechanism), replace if necessary
  • Check seat connection
  • Replace gas generator of active head restraint

If the severity of the crash has not caused any other damage to the seat, only the triggered gas generator needs to be replaced.

External feature: The triggered head restraint is folded forwards and engaged.

The repair work can be carried out in the vehicle with the rear panel removed. The entire system can be pushed back into its original position and the new gas generator installed.

The gas generator can be replaced up to 5 times.

• Replace airbag module and seat cover with upholstery

• Only I01: If one of the following criteria is met, the backrest frame must be replaced! (Part number of backrest frame: 52 10 7 388 646)
  • Activated belt tensioner
  • Activated end fitting pretensioner
  • Outer cover unclipped by a side collision
  • Outer cover ripped off by a side collision
  • Faulty clip connection on outer cover caused by a side collision

Driver's airbag 

• Components
  • Airbag module
  • Steering wheel
  • Steering column (if damaged)
• Procedure
  • Check components, replace if necessary
  • Replace steering wheel

Front passenger airbag 

• Components
  • Airbag module
  • Dashboard trim panel (must be replaced!)
  • Supporting tube (if damaged)
• Procedure
  • Check components, replace if necessary

Side airbag, front/rear 

• Components
  • Airbag module
  • Door trim panel
  • Door in white
  • Seat
• Procedure
  • Check components; replace if necessary

Head airbag 

• Components
  • Airbag module
  • A-pillar trim panel
  • Headliner
  • B-pillar trim panel (if damaged)
  • C-pillar trim panel (if damaged)
  • Connection/mount (on side frame)
• Procedure
  • Check components, replace if necessary

Knee airbag 

• Components
  • Trim panel (driver's side)
  • Lower part of glove compartment
  • Knee protection (Driver- and passenger's side)
• Procedure
  • Check components, replace if necessary

Knee protection 

• Components
  • Trim panel (driver's side)
  • Glove compartment incl. knee protection (passenger's side)
• Procedure
  • Check components for damage, replace if necessary
  • Check retaining elements