52 14 385 Replacing Gas Cartridge For Crash-Active Head Restraint on Left or Right Front Seat

52 14 385 Replacing Gas Cartridge For Crash-Active Headrest On Left Or Right Front Seat







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 head restraint and thereby cause injury.

Switch off ignition.







Necessary preliminary work:
- Disconnect battery negative lead
- A second person is required for this task







IMPORTANT:
- The pyrotechnical device may be replaced up to 5 times.
- Triggering frequency is denoted on the sticker on the head restraint carrier.
- Stickers are available as spare parts.







Starting situation:

Head restraint is in the crash position after being triggered.







Unclip the pushbutton (1).

NOTE: Preloaded spring behind pushbutton.







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.







Disconnecting the pyrotechnical unit:

Unlock plug connection (1) and disconnect.







Removing pyrotechnical unit:

Unclip pyrotechnical unit (1) from the mounting points.







Procedure for installing pyrotechnical unit:







Bringing head restraint together:

Pull out the complete release mechanism for pushbutton with a screwdriver (1).
Hold position of release mechanism.







NOTE: A second person is required for this task.

Firmly press the front section of the head restraint (1) towards rear as far as it will go.

Keep position pressed.







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







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.







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.







Mounting cover:

Clip cover onto carrier section.

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







Mounting the pushbutton:

Insert the pushbutton with spring.







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 pushbutton.

Move the front section in completely and compare the distance.