52 14 886 Replacing gas cartridge for crash-active headrest on left or right (from 06/2010)

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WARNING: Read and comply with safety regulations for handling airbag modules and pyrotechnical belt pretensioners, see 72 00... SAFETY REGULATIONS FOR HANDLING COMPONENTS WITH GAS GENERATORS .
Incorrect handling may result in triggering of the crash-active head restraint and thereby cause injury.

Switch off ignition!

Necessary preliminary tasks:

Disconnect battery negative lead , see 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
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 In Crash Position After Activation

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Courtesy of BMW OF NORTH AMERICA, INC.

Unclip the pushbutton (1).

NOTE: Preloaded spring behind pushbutton.

Fig 2: Unclipping Pushbutton

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Courtesy of BMW OF NORTH AMERICA, INC.

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: Removing Cover

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Courtesy of BMW OF NORTH AMERICA, INC.

Disconnecting the pyrotechnical unit: Unlock plug connection (1) and disconnect.

Fig 4: Identifying Connector

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Courtesy of BMW OF NORTH AMERICA, INC.

Removing pyrotechnical unit: Unclip pyrotechnical unit (1) from the attachment points.

Fig 5: Identifying Pyrotechnical Unit And Clips

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Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fig 6: Pulling Out Complete Release Mechanism For Pushbutton With Screwdriver

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Courtesy of BMW OF NORTH AMERICA, INC.

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 Front Section Of Head Restraint Towards Rear

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Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 8: Identifying Deployment Range

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Courtesy of BMW OF NORTH AMERICA, INC.

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: Identifying Pyrotechnical Unit And Clips

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Courtesy of BMW OF NORTH AMERICA, INC.

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: Laying Wiring Harness

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Courtesy of BMW OF NORTH AMERICA, INC.

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: Installing Cover

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Courtesy of BMW OF NORTH AMERICA, INC.

Mounting the pushbutton: Insert the pushbutton with spring.

Fig 12: Installing Pushbutton

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Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fig 13: Performing Function Check

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Courtesy of BMW OF NORTH AMERICA, INC.