52 17 886 Replacing gas cartridge for crash-active headrest on left or right

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WARNING: Read and comply with SAFETY REGULATIONS for handling airbag modules and pyrotechnical belt tensioners.
Incorrect handling may result in triggering of the crash-active headrest and thereby cause injury.

Switch off the ignition!

Necessary preliminary tasks

Adjust head restraint towards top to maximum extent
Disconnect BATTERY NEGATIVE CABLE .
M5 only:
Remove CRASH-ACTIVE HEADREST .

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: Firing unit can only be removed in the triggered state.

The complete head restraint must be replaced in the event of a crash-active headrest fault message and non-activated igniter.

Fig 1: Removing Head Restraint

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Removing cover:

Insert flat plastic wedge in marked area.

Unlock cover towards bottom and simultaneously press towards rear.

Repeat procedure on other side.

Fig 2: Removing Head Restraint Cover

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Press cover towards top to unlock latch mechanism in marked area.

Simultaneously pull cover towards rear.

Fig 3: Pressing Head Restraint Cover To Unlock Latch Mechanism

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Put down cover towards rear.

Fig 4: Putting Down Head Restraint Cover Towards Rear

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Removing pyrotechnics:

Press together mounting (1) for pyrotechnics at tabs.

Feed out pyrotechnics.

Fig 5: Pressing Bracket Tabs For Pyrotechnical Device

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Removing pyroactivator:

Pull pyroactivator (2) out of mount (1) for pyrotechnics.

Unlock PLUG CONNECTION (3) and disconnect.

IMPORTANT: Dispose of plastic element and pyroactivator.

Fig 6: Identifying Mounting, Pyroactivator And Plug Connection

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Procedure for installing pyrotechnics:

Bringing head restraint together (multifunction seat):

Pull apart spring catches and push together head restraint.

Maintain position.

Fig 7: Pushing Head Restraint

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Locking release plate:

Hold pushed-together head restraint in position and push release plate (1) upwards up to limit position.

Release plate (1) must audibly snap into place.

Fig 8: Pushing Release Plate

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Fig 9: Locating Head Restraint Lock Spring

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Checking head restraint lock:

Check end position of release plate (1).

All four springs (2) must be engaged.

Replacing pyrotechnics:

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

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

Fig 10: Identifying Connector, Clip Pyroactivator And Mounting

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Installing pyrotechnics:

Press together mounting for pyrotechnics at tabs.

Insert mounting for pyrotechnics into release plate and tilt in upward direction.

Mounting for pyrotechnics must audibly snap into place.

NOTE: Check seating of retaining lugs in mounting.

Fig 11: Installing Pyrotechnical Device

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Laying wiring harness:

Secure wiring harness in support section with strain relief.

Fig 12: Securing Wiring Harness In Carrier Section

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Mounting cover:

Clip cover onto support section.

Cover must audibly snap into place.

Fig 13: Installing Clip Cover Onto Support Section

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