52 14 886 Replacing gas cartridge for crash-active headrest on left or right (from 09/2010)

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:

Disconnect BATTERY NEGATIVE CABLE
Adjust head restraint towards top to maximum extent
A second person is required for this task

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.

Fig 1: Identifying Head Restraint

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Unclip the push-button (1).

NOTE: Preloaded spring behind push-button.

Fig 2: Identifying Push-Button

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Removing cover:

Press the cover (1) at the top and bottom simultaneously and pull towards rear.

First the left-hand side, then the right-hand side.

Fig 3: Pressing Top And Bottom Cover

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Disconnecting the pyrotechnical unit:

Unlock plug connection(1) AND DISCONNECT .

Fig 4: Identifying Plug Connection

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Removing pyrotechnical unit:

Unclip pyrotechnical unit (1) from the attachment points.

Fig 5: Removing Pyrotechnical Unit

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Procedure for installing pyrotechnical unit:

Bringing head restraint together:

Pull out the complete release mechanism for push-button with a screwdriver (1).

Hold position of release mechanism.

Fig 6: Pulling Push-Button Release Mechanism Using Screwdriver

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NOTE: A second person is required for this task.

Firmly press the front section of the head restraint (1) towards rear until limit position.

Keep position pressed.

Fig 7: Pressing Head Restraint Front Section

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Press the head restraint until the marked deployment range of the pyrotechnical unit is uncovered.

Fig 8: Locating Head Restraint Marked Deployment Range

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Inserting the pyrotechnical unit:

Insert cotter pin of pyrotechnical unit (1) in the uncovered area.

Firmly clip in the pyrotechnical unit (1).

Installation note:

Make sure the pyroactivator is correctly seated in the latch mechanism.

Fig 9: Removing Pyrotechnical Unit

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Laying wiring harness:

Secure wiring harness (1) in carrier section with strain relief.

CONNECT AND LOCK plug connection.

Make sure once again that the pyrotechnical unit (1) is correctly seated in the retaining lugs.

Fig 10: Locating Carrier Section Wiring Harness

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Mounting cover:

Clip cover onto support section.

Fit the cover and listen for it to snap into place on the left and right.

Fig 11: Identifying Support Section Cover

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Mounting the push-button:

Insert the push-button with spring.

Fig 12: Identifying Push-Button And Spring

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Perform function check:

Check the comfort adjustment.

Installation note:

Correct assembly can be checked by looking at the distance between the front section of the head restraint and the push-button.

Move the front section in completely and compare the distance.

Fig 13: Checking Push-Button Comfort Adjustment

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