52 13 385 Replacing gas cartridge (pyroactivator) for crash-active head restraint on front seat

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WARNING: Read and comply with safety regulations for handling airbag modules and pyrotechnical belt pretensioners. Incorrect handling may result in triggering of the crash-active head restraint and thereby cause injury. See 72 00 .. SAFETY REGULATIONS FOR HANDLING COMPONENTS WITH GAS GENERATORS .

Switch off ignition!

Necessary preliminary tasks:

Disconnect battery negative lead. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
Remove crash-active head restraint .

IMPORTANT: The pyrotechnical device may be replaced up to 5 times. Triggering frequency is denoted on the sticker on the head restraint carrier. Stickers are available as spare parts.

Starting situation: Head restraint is in the crash position after being triggered.

Fig 1: Head Restraint In Crash Position

G00497311

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Pyroactivator can only be removed in the triggered state. The complete crash-active head restraint must be replaced if the event of a head restraint fault signal and an untriggered pyroactivator.

Removing cover: Raise cover (1) and pull towards rear.

Fig 2: Raise Cover (1) And Pull Towards Rear

G00497312

Courtesy of BMW OF NORTH AMERICA, INC.

Removing pyrotechnical device: Press together retainer (1) for pyrotechnical device at lugs. Feed out pyrotechnical device.

Fig 3: Press Together Retainer (1) For Pyrotechnical Device

G00497313

Courtesy of BMW OF NORTH AMERICA, INC.

Removing pyroactivator: Pull pyroactivator (2) out of mounting (1) for pyrotechnical device. Unlock plug connection (3) and disconnect.

Fig 4: Pull Pyroactivator (2) Out Of Mounting

G00497314

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Dispose of plastic element and pyroactivator.

Procedure for installing pyrotechnical device:

Bringing head restraint together - version without button (MFS): Pull spring catches apart and push head restraint together. Maintain position.

Fig 5: Pull Spring Catches Apart And Push Head Restraint Together

G00497315

Courtesy of BMW OF NORTH AMERICA, INC.

Bringing head restraint together - version with button (Basic): Press button (1) and push head restraint together. Maintain position.

Fig 6: Press Button (1) And Push Head Restraint Together

G00497316

Courtesy of BMW OF NORTH AMERICA, INC.

Locking release plate: Hold pushed-together head restraint in position and push release plate (1) upwards up to stop. Release plate (1) must audibly snap into place.

Fig 7: Push Release Plate (1) Upwards Up To Stop

G00497317

Courtesy of BMW OF NORTH AMERICA, INC.

Checking head restraint lock: Check end position of release plate (1). All four springs must be engaged (snapped into place).

Fig 8: Check End Position Of Release Plate (1)

G00497319

Courtesy of BMW OF NORTH AMERICA, INC.

Replacing pyrotechnical device: Connect plug (1) to new pyroactivator (2) and lock. Clip pyroactivator (2) into new mounting (3).

Fig 9: Connect Plug (1) To New Pyroactivator (2) And Lock

G00497320

Courtesy of BMW OF NORTH AMERICA, INC.

Installing pyrotechnical device: Press together retainer for pyrotechnical device at lugs. Insert retainer for pyrotechnical device into release plate and tilt in upward direction. Retainer for pyrotechnical device must audibly snap into place.

NOTE: Check seating of retaining lugs in retainer.

Fig 10: Check Seating Of Retaining Lugs In Retainer

G00497321

Courtesy of BMW OF NORTH AMERICA, INC.

Laying wiring harness: Secure wiring harness in carrier section with strain relief.

Fig 11: Secure Wiring Harness In Carrier Section

G00497322

Courtesy of BMW OF NORTH AMERICA, INC.

Mounting cover: Clip cover onto carrier section. Cover must audibly snap into place.

Fig 12: Clip Cover Onto Carrier Section

G00497323

Courtesy of BMW OF NORTH AMERICA, INC.