52 14 886 Replacing gas cartridge for crash-active headrest on left or right

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 headrest and thereby cause injury.

Switch off the ignition!

Necessary preliminary work:

Disconnect NEGATIVE BATTERY LEAD

IMPORTANT: Renewal of firing unit may be carried out up to 4 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 exchanged in the event of a crash-active headrest fault message and non-activated ignition squib.

Lever out cover welt in marked area.

Remove cover with padding from head restraint.

Fig 1: Identifying Cover Removing Areas

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Unclip service flap.

Move firing unit (1) forwards and remove towards front.

Fig 2: Moving Firing Unit

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Unfasten plug connection (1) and disconnect.

Replace firing unit.

Installation note:

Plug connection (1) must audibly snap into place.

Check firm engagement of plug connection (1) by gently pulling on connector.

Lay cable in side guide.

Fig 3: Identifying Firing Unit Plug Connection

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Press locking spring (1) on left and right through opening and secure with cylindrical pins (or similar).

Head restraint is unlocked.

Fig 4: Pressing Locking Spring

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IMPORTANT: Carry out this repair work with a second person, as extra effort is necessary.

Pull head restraint (1) at an angle downwards until it is completely in lowest position and rests on linkage.

Hold head restraint (1) in this position for the following tasks.

Fig 5: Pulling Head Restraint

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Clip firing unit (1) onto linkage (2).

Installation note:

Check that firing unit (1) is firmly seated on linkage.

Press firing unit (1) forwards and clip into place.

IMPORTANT: Firing unit (1) must audibly snap into place.

Fig 6: Pressing Firing Unit Forwards

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Installation note:

Visually check that firing unit is correctly seated.

Attach label for identification after replacement.

Clip service flap into place.

Fig 7: Identifying Firing Unit

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