52 14 385 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. Switch off ignition!

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. Note that 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.

Fig 1: Head Restraint In Crash Position After Being Triggered

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Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Raise Cover And Pull Toward Rear

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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: Removing Pyrotechnical Device

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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. Important! Dispose of plastic element and pyroactivator.

Fig 4: Removing Pyroactivator

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Courtesy of BMW OF NORTH AMERICA, INC.

Procedure for installing pyrotechnical device: Bringing head restraint together - version without button (MFS): Pull spring catches apart and push head restraint together. Maintain position. Bringing head restraint together - version with button (Basic): Press button (1) and push head restraint together. Maintain position.

Fig 5: Pulling Spring Catches Apart And Pushing Head Restraint Together

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Courtesy of BMW OF NORTH AMERICA, INC.

Fig 6: Pressing Button (1) And Pushing Head

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Courtesy of BMW OF NORTH AMERICA, INC.

d restraint in position and push release plate (1) upwards up to stop. Release plate (1) must audibly snap into place.

Fig 7: Holding Pushed-Together Head Restraint In Position And Pushing Release Plate (1) Upward Up To Stop

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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: Checking End Position Of Release Plate (1)

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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: Connecting Plug (1) To New Pyroactivator (2)

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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: Press Together Retainer For Pyrotechnical Device At Lugs

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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

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Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 12: Clip Cover In Position

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Courtesy of BMW OF NORTH AMERICA, INC.