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

WARNING: This page is about a different car, the 2010 BMW 535xi, 2009 BMW 535xi, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.

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!

Necessary preliminary tasks:

Disconnect BATTERY NEGATIVE LEAD
Adjust head restraint towards top to maximum extent

IMPORTANT:

Renewal of pyrotechnics may be carried out up to 5 times.

Triggering frequency is denoted on the sticker on the head restraint carrier.

Labels are available as spare parts.

Starting situation:

Head restraint is in the crash position after activation.

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 message and non-activated pyroactivator.

Fig 1: Identifying Head Restraint

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Removing cover:

Raise cover (1) and pull rearwards.

Fig 2: Pulling Cover

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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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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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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: Identifying Head Restraint Position

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Bringing head restraint together - version with button (Basic):

Press button (1) and push head restraint together.

Maintain position.

Fig 6: Procedure For Installing Pyrotechnical Device - Version With Button (Basic)

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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: Locking Release Plate

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Checking head restraint lock:

Check end position of release plate (1).

All four springs must be engaged (snapped into place).

Fig 8: Checking Head Restraint Lock

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Replacing pyrotechnics:

Connect connector (1) to new pyroactivator (2) and LOCK .

Clip pyroactivator (2) into new mounting (3).

Fig 9: Replacing Pyrotechnical Device

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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: Installing Pyrotechnical Device

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Laying wiring harness:

Secure wiring harness in carrier section with strain relief.

Fig 11: Laying Wiring Harness

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Mounting cover:

Clip cover onto carrier section.

Cover must audibly snap into place.

Fig 12: Mounting Cover

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