52 17 385 Replacing gas cartridge for active head restraint on left or right front seat

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, 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 tensioners.
Improper handling can lead to triggering of the pyrotechnical seat belt tensioner or side airbag, resulting in injuries.

Switch off ignition!

Necessary preliminary tasks:

Remove HEAD RESTRAINT
Remove REAR PANEL on front seat backrest

Disconnect plug connection on gas cartridge.

Detach retaining points (1).

Slide active head restraint carrier downwards.

Fig 1: Identifying Retaining Points

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Release spring clips (1) and (2).

Fig 2: Identifying Spring Clips

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Release screws (1).

Remove gas cartridge complete with holder (2).

Fig 3: Identifying Holder And Screws

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Release screws (1) on left and right.

Installation:

Insert screws (1) with Loctite.

Tightening torque 52 10 18AZ .

Slide top rail (3) off bottom rail (2).

Remove gas cartridge (4).

Fig 4: Identifying Top Rail, Bottom Rail And Screws

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Installation:

Gas cartridge (1) is secured in holder by guide lug (2).

Fig 5: Identifying Guide Lug And Gas Cartridge

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Procedure after triggered active head restraint:

Push head restraint back into original position.
Insert new gas cartridge with spring clips.

NOTE:

The gas cartridge may be replaced up to 5 times.

Then the backrest must be replaced.

Number of triggerings are stored in the control unit.